]> git.lizzy.rs Git - dragonfireclient.git/blobdiff - src/map.cpp
Merge remote-tracking branch 'origin/master'
[dragonfireclient.git] / src / map.cpp
index 6ba33288d7a07c20f88dcdb84da96e8e6af40d85..43502253b14121b2aa3fb12e9f5e9af64f221cdb 100644 (file)
@@ -1,18 +1,18 @@
 /*
-Minetest-c55
-Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
 This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
+GNU Lesser General Public License for more details.
 
-You should have received a copy of the GNU General Public License along
+You should have received a copy of the GNU Lesser General Public License along
 with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
@@ -21,35 +21,34 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mapsector.h"
 #include "mapblock.h"
 #include "main.h"
-#ifndef SERVER
-#include "client.h"
-#endif
 #include "filesys.h"
-#include "utility.h"
 #include "voxel.h"
 #include "porting.h"
 #include "mapgen.h"
 #include "nodemetadata.h"
-#include "content_mapnode.h"
-#ifndef SERVER
-#include <IMaterialRenderer.h>
-#endif
 #include "settings.h"
 #include "log.h"
 #include "profiler.h"
+#include "nodedef.h"
+#include "gamedef.h"
+#include "util/directiontables.h"
+#include "rollback_interface.h"
+#include "emerge.h"
+#include "mapgen_v6.h"
+#include "mapgen_indev.h"
 
 #define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
 
 /*
        SQLite format specification:
        - Initially only replaces sectors/ and sectors2/
-       
+
        If map.sqlite does not exist in the save dir
        or the block was not found in the database
        the map will try to load from sectors folder.
        In either case, map.sqlite will be created
        and all future saves will save there.
-       
+
        Structure of map.sqlite:
        Tables:
                blocks
@@ -61,8 +60,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
        Map
 */
 
-Map::Map(std::ostream &dout):
+Map::Map(std::ostream &dout, IGameDef *gamedef):
        m_dout(dout),
+       m_gamedef(gamedef),
        m_sector_cache(NULL)
 {
        /*m_sector_mutex.Init();
@@ -74,34 +74,30 @@ Map::~Map()
        /*
                Free all MapSectors
        */
-       core::map<v2s16, MapSector*>::Iterator i = m_sectors.getIterator();
-       for(; i.atEnd() == false; i++)
+       for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
+               i != m_sectors.end(); ++i)
        {
-               MapSector *sector = i.getNode()->getValue();
-               delete sector;
+               delete i->second;
        }
 }
 
 void Map::addEventReceiver(MapEventReceiver *event_receiver)
 {
-       m_event_receivers.insert(event_receiver, false);
+       m_event_receivers.insert(event_receiver);
 }
 
 void Map::removeEventReceiver(MapEventReceiver *event_receiver)
 {
-       if(m_event_receivers.find(event_receiver) == NULL)
-               return;
-       m_event_receivers.remove(event_receiver);
+       m_event_receivers.erase(event_receiver);
 }
 
 void Map::dispatchEvent(MapEditEvent *event)
 {
-       for(core::map<MapEventReceiver*, bool>::Iterator
-                       i = m_event_receivers.getIterator();
-                       i.atEnd()==false; i++)
+       for(std::set<MapEventReceiver*>::iterator
+                       i = m_event_receivers.begin();
+                       i != m_event_receivers.end(); ++i)
        {
-               MapEventReceiver* event_receiver = i.getNode()->getKey();
-               event_receiver->onMapEditEvent(event);
+               (*i)->onMapEditEvent(event);
        }
 }
 
@@ -111,14 +107,14 @@ MapSector * Map::getSectorNoGenerateNoExNoLock(v2s16 p)
                MapSector * sector = m_sector_cache;
                return sector;
        }
-       
-       core::map<v2s16, MapSector*>::Node *n = m_sectors.find(p);
-       
-       if(n == NULL)
+
+       std::map<v2s16, MapSector*>::iterator n = m_sectors.find(p);
+
+       if(n == m_sectors.end())
                return NULL;
-       
-       MapSector *sector = n->getValue();
-       
+
+       MapSector *sector = n->second;
+
        // Cache the last result
        m_sector_cache_p = p;
        m_sector_cache = sector;
@@ -136,7 +132,7 @@ MapSector * Map::getSectorNoGenerate(v2s16 p)
        MapSector *sector = getSectorNoGenerateNoEx(p);
        if(sector == NULL)
                throw InvalidPositionException();
-       
+
        return sector;
 }
 
@@ -151,7 +147,7 @@ MapBlock * Map::getBlockNoCreateNoEx(v3s16 p3d)
 }
 
 MapBlock * Map::getBlockNoCreate(v3s16 p3d)
-{      
+{
        MapBlock *block = getBlockNoCreateNoEx(p3d);
        if(block == NULL)
                throw InvalidPositionException();
@@ -206,6 +202,15 @@ void Map::setNode(v3s16 p, MapNode & n)
        v3s16 blockpos = getNodeBlockPos(p);
        MapBlock *block = getBlockNoCreate(blockpos);
        v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
+       // Never allow placing CONTENT_IGNORE, it fucks up stuff
+       if(n.getContent() == CONTENT_IGNORE){
+               errorstream<<"Map::setNode(): Not allowing to place CONTENT_IGNORE"
+                               <<" while trying to replace \""
+                               <<m_gamedef->ndef()->get(block->getNodeNoCheck(relpos)).name
+                               <<"\" at "<<PP(p)<<" (block "<<PP(blockpos)<<")"<<std::endl;
+               debug_stacks_print_to(infostream);
+               return;
+       }
        block->setNodeNoCheck(relpos, n);
 }
 
@@ -228,10 +233,12 @@ void Map::setNode(v3s16 p, MapNode & n)
        values of from_nodes are lighting values.
 */
 void Map::unspreadLight(enum LightBank bank,
-               core::map<v3s16, u8> & from_nodes,
-               core::map<v3s16, bool> & light_sources,
-               core::map<v3s16, MapBlock*>  & modified_blocks)
+               std::map<v3s16, u8> & from_nodes,
+               std::set<v3s16> & light_sources,
+               std::map<v3s16, MapBlock*>  & modified_blocks)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        v3s16 dirs[6] = {
                v3s16(0,0,1), // back
                v3s16(0,1,0), // top
@@ -240,15 +247,13 @@ void Map::unspreadLight(enum LightBank bank,
                v3s16(0,-1,0), // bottom
                v3s16(-1,0,0), // left
        };
-       
+
        if(from_nodes.size() == 0)
                return;
-       
+
        u32 blockchangecount = 0;
 
-       core::map<v3s16, u8> unlighted_nodes;
-       core::map<v3s16, u8>::Iterator j;
-       j = from_nodes.getIterator();
+       std::map<v3s16, u8> unlighted_nodes;
 
        /*
                Initialize block cache
@@ -257,12 +262,13 @@ void Map::unspreadLight(enum LightBank bank,
        MapBlock *block = NULL;
        // Cache this a bit, too
        bool block_checked_in_modified = false;
-       
-       for(; j.atEnd() == false; j++)
+
+       for(std::map<v3s16, u8>::iterator j = from_nodes.begin();
+               j != from_nodes.end(); ++j)
        {
-               v3s16 pos = j.getNode()->getKey();
+               v3s16 pos = j->first;
                v3s16 blockpos = getNodeBlockPos(pos);
-               
+
                // Only fetch a new block if the block position has changed
                try{
                        if(block == NULL || blockpos != blockpos_last){
@@ -282,12 +288,12 @@ void Map::unspreadLight(enum LightBank bank,
                        continue;
 
                // Calculate relative position in block
-               v3s16 relpos = pos - blockpos_last * MAP_BLOCKSIZE;
+               //v3s16 relpos = pos - blockpos_last * MAP_BLOCKSIZE;
 
                // Get node straight from the block
-               MapNode n = block->getNode(relpos);
+               //MapNode n = block->getNode(relpos);
 
-               u8 oldlight = j.getNode()->getValue();
+               u8 oldlight = j->second;
 
                // Loop through 6 neighbors
                for(u16 i=0; i<6; i++)
@@ -328,22 +334,23 @@ void Map::unspreadLight(enum LightBank bank,
                                        If the neighbor is dimmer than what was specified
                                        as oldlight (the light of the previous node)
                                */
-                               if(n2.getLight(bank) < oldlight)
+                               if(n2.getLight(bank, nodemgr) < oldlight)
                                {
                                        /*
                                                And the neighbor is transparent and it has some light
                                        */
-                                       if(n2.light_propagates() && n2.getLight(bank) != 0)
+                                       if(nodemgr->get(n2).light_propagates
+                                                       && n2.getLight(bank, nodemgr) != 0)
                                        {
                                                /*
                                                        Set light to 0 and add to queue
                                                */
 
-                                               u8 current_light = n2.getLight(bank);
-                                               n2.setLight(bank, 0);
+                                               u8 current_light = n2.getLight(bank, nodemgr);
+                                               n2.setLight(bank, 0, nodemgr);
                                                block->setNode(relpos, n2);
 
-                                               unlighted_nodes.insert(n2pos, current_light);
+                                               unlighted_nodes[n2pos] = current_light;
                                                changed = true;
 
                                                /*
@@ -362,16 +369,16 @@ void Map::unspreadLight(enum LightBank bank,
                                                light_sources.remove(n2pos);*/
                                }
                                else{
-                                       light_sources.insert(n2pos, true);
+                                       light_sources.insert(n2pos);
                                }
 
                                // Add to modified_blocks
                                if(changed == true && block_checked_in_modified == false)
                                {
                                        // If the block is not found in modified_blocks, add.
-                                       if(modified_blocks.find(blockpos) == NULL)
+                                       if(modified_blocks.find(blockpos) == modified_blocks.end())
                                        {
-                                               modified_blocks.insert(blockpos, block);
+                                               modified_blocks[blockpos] = block;
                                        }
                                        block_checked_in_modified = true;
                                }
@@ -397,11 +404,11 @@ void Map::unspreadLight(enum LightBank bank,
 */
 void Map::unLightNeighbors(enum LightBank bank,
                v3s16 pos, u8 lightwas,
-               core::map<v3s16, bool> & light_sources,
-               core::map<v3s16, MapBlock*>  & modified_blocks)
+               std::set<v3s16> & light_sources,
+               std::map<v3s16, MapBlock*>  & modified_blocks)
 {
-       core::map<v3s16, u8> from_nodes;
-       from_nodes.insert(pos, lightwas);
+       std::map<v3s16, u8> from_nodes;
+       from_nodes[pos] = lightwas;
 
        unspreadLight(bank, from_nodes, light_sources, modified_blocks);
 }
@@ -411,9 +418,11 @@ void Map::unLightNeighbors(enum LightBank bank,
        goes on recursively.
 */
 void Map::spreadLight(enum LightBank bank,
-               core::map<v3s16, bool> & from_nodes,
-               core::map<v3s16, MapBlock*> & modified_blocks)
+               std::set<v3s16> & from_nodes,
+               std::map<v3s16, MapBlock*> & modified_blocks)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        const v3s16 dirs[6] = {
                v3s16(0,0,1), // back
                v3s16(0,1,0), // top
@@ -428,9 +437,7 @@ void Map::spreadLight(enum LightBank bank,
 
        u32 blockchangecount = 0;
 
-       core::map<v3s16, bool> lighted_nodes;
-       core::map<v3s16, bool>::Iterator j;
-       j = from_nodes.getIterator();
+       std::set<v3s16> lighted_nodes;
 
        /*
                Initialize block cache
@@ -440,12 +447,10 @@ void Map::spreadLight(enum LightBank bank,
        // Cache this a bit, too
        bool block_checked_in_modified = false;
 
-       for(; j.atEnd() == false; j++)
-       //for(; j != from_nodes.end(); j++)
+       for(std::set<v3s16>::iterator j = from_nodes.begin();
+               j != from_nodes.end(); ++j)
        {
-               v3s16 pos = j.getNode()->getKey();
-               //v3s16 pos = *j;
-               //infostream<<"pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"<<std::endl;
+               v3s16 pos = *j;
                v3s16 blockpos = getNodeBlockPos(pos);
 
                // Only fetch a new block if the block position has changed
@@ -472,7 +477,7 @@ void Map::spreadLight(enum LightBank bank,
                // Get node straight from the block
                MapNode n = block->getNode(relpos);
 
-               u8 oldlight = n.getLight(bank);
+               u8 oldlight = n.getLight(bank, nodemgr);
                u8 newlight = diminish_light(oldlight);
 
                // Loop through 6 neighbors
@@ -510,24 +515,22 @@ void Map::spreadLight(enum LightBank bank,
                                        If the neighbor is brighter than the current node,
                                        add to list (it will light up this node on its turn)
                                */
-                               if(n2.getLight(bank) > undiminish_light(oldlight))
+                               if(n2.getLight(bank, nodemgr) > undiminish_light(oldlight))
                                {
-                                       lighted_nodes.insert(n2pos, true);
-                                       //lighted_nodes.push_back(n2pos);
+                                       lighted_nodes.insert(n2pos);
                                        changed = true;
                                }
                                /*
                                        If the neighbor is dimmer than how much light this node
                                        would spread on it, add to list
                                */
-                               if(n2.getLight(bank) < newlight)
+                               if(n2.getLight(bank, nodemgr) < newlight)
                                {
-                                       if(n2.light_propagates())
+                                       if(nodemgr->get(n2).light_propagates)
                                        {
-                                               n2.setLight(bank, newlight);
+                                               n2.setLight(bank, newlight, nodemgr);
                                                block->setNode(relpos, n2);
-                                               lighted_nodes.insert(n2pos, true);
-                                               //lighted_nodes.push_back(n2pos);
+                                               lighted_nodes.insert(n2pos);
                                                changed = true;
                                        }
                                }
@@ -536,9 +539,9 @@ void Map::spreadLight(enum LightBank bank,
                                if(changed == true && block_checked_in_modified == false)
                                {
                                        // If the block is not found in modified_blocks, add.
-                                       if(modified_blocks.find(blockpos) == NULL)
+                                       if(modified_blocks.find(blockpos) == modified_blocks.end())
                                        {
-                                               modified_blocks.insert(blockpos, block);
+                                               modified_blocks[blockpos] = block;
                                        }
                                        block_checked_in_modified = true;
                                }
@@ -564,15 +567,17 @@ void Map::spreadLight(enum LightBank bank,
 */
 void Map::lightNeighbors(enum LightBank bank,
                v3s16 pos,
-               core::map<v3s16, MapBlock*> & modified_blocks)
+               std::map<v3s16, MapBlock*> & modified_blocks)
 {
-       core::map<v3s16, bool> from_nodes;
-       from_nodes.insert(pos, true);
+       std::set<v3s16> from_nodes;
+       from_nodes.insert(pos);
        spreadLight(bank, from_nodes, modified_blocks);
 }
 
 v3s16 Map::getBrightestNeighbour(enum LightBank bank, v3s16 p)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        v3s16 dirs[6] = {
                v3s16(0,0,1), // back
                v3s16(0,1,0), // top
@@ -598,8 +603,8 @@ v3s16 Map::getBrightestNeighbour(enum LightBank bank, v3s16 p)
                {
                        continue;
                }
-               if(n2.getLight(bank) > brightest_light || found_something == false){
-                       brightest_light = n2.getLight(bank);
+               if(n2.getLight(bank, nodemgr) > brightest_light || found_something == false){
+                       brightest_light = n2.getLight(bank, nodemgr);
                        brightest_pos = n2pos;
                        found_something = true;
                }
@@ -620,8 +625,10 @@ v3s16 Map::getBrightestNeighbour(enum LightBank bank, v3s16 p)
        Mud is turned into grass in where the sunlight stops.
 */
 s16 Map::propagateSunlight(v3s16 start,
-               core::map<v3s16, MapBlock*> & modified_blocks)
+               std::map<v3s16, MapBlock*> & modified_blocks)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        s16 y = start.Y;
        for(; ; y--)
        {
@@ -640,23 +647,15 @@ s16 Map::propagateSunlight(v3s16 start,
                v3s16 relpos = pos - blockpos*MAP_BLOCKSIZE;
                MapNode n = block->getNode(relpos);
 
-               if(n.sunlight_propagates())
+               if(nodemgr->get(n).sunlight_propagates)
                {
-                       n.setLight(LIGHTBANK_DAY, LIGHT_SUN);
+                       n.setLight(LIGHTBANK_DAY, LIGHT_SUN, nodemgr);
                        block->setNode(relpos, n);
 
-                       modified_blocks.insert(blockpos, block);
+                       modified_blocks[blockpos] = block;
                }
                else
                {
-                       /*// Turn mud into grass
-                       if(n.getContent() == CONTENT_MUD)
-                       {
-                               n.setContent(CONTENT_GRASS);
-                               block->setNode(relpos, n);
-                               modified_blocks.insert(blockpos, block);
-                       }*/
-
                        // Sunlight goes no further
                        break;
                }
@@ -665,9 +664,11 @@ s16 Map::propagateSunlight(v3s16 start,
 }
 
 void Map::updateLighting(enum LightBank bank,
-               core::map<v3s16, MapBlock*> & a_blocks,
-               core::map<v3s16, MapBlock*> & modified_blocks)
+               std::map<v3s16, MapBlock*> & a_blocks,
+               std::map<v3s16, MapBlock*> & modified_blocks)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        /*m_dout<<DTIME<<"Map::updateLighting(): "
                        <<a_blocks.size()<<" blocks."<<std::endl;*/
 
@@ -677,17 +678,21 @@ void Map::updateLighting(enum LightBank bank,
        //bool debug=true;
        //u32 count_was = modified_blocks.size();
 
-       core::map<v3s16, MapBlock*> blocks_to_update;
+       std::map<v3s16, MapBlock*> blocks_to_update;
 
-       core::map<v3s16, bool> light_sources;
+       std::set<v3s16> light_sources;
 
-       core::map<v3s16, u8> unlight_from;
+       std::map<v3s16, u8> unlight_from;
 
-       core::map<v3s16, MapBlock*>::Iterator i;
-       i = a_blocks.getIterator();
-       for(; i.atEnd() == false; i++)
+       int num_bottom_invalid = 0;
+
+       {
+       //TimeTaker t("first stuff");
+
+       for(std::map<v3s16, MapBlock*>::iterator i = a_blocks.begin();
+               i != a_blocks.end(); ++i)
        {
-               MapBlock *block = i.getNode()->getValue();
+               MapBlock *block = i->second;
 
                for(;;)
                {
@@ -696,9 +701,9 @@ void Map::updateLighting(enum LightBank bank,
                                break;
 
                        v3s16 pos = block->getPos();
-                       modified_blocks.insert(pos, block);
-
-                       blocks_to_update.insert(pos, block);
+                       v3s16 posnodes = block->getPosRelative();
+                       modified_blocks[pos] = block;
+                       blocks_to_update[pos] = block;
 
                        /*
                                Clear all light from block
@@ -710,21 +715,24 @@ void Map::updateLighting(enum LightBank bank,
 
                                try{
                                        v3s16 p(x,y,z);
-                                       MapNode n = block->getNode(v3s16(x,y,z));
-                                       u8 oldlight = n.getLight(bank);
-                                       n.setLight(bank, 0);
-                                       block->setNode(v3s16(x,y,z), n);
+                                       MapNode n = block->getNode(p);
+                                       u8 oldlight = n.getLight(bank, nodemgr);
+                                       n.setLight(bank, 0, nodemgr);
+                                       block->setNode(p, n);
+
+                                       // If node sources light, add to list
+                                       u8 source = nodemgr->get(n).light_source;
+                                       if(source != 0)
+                                               light_sources.insert(p + posnodes);
 
                                        // Collect borders for unlighting
-                                       if(x==0 || x == MAP_BLOCKSIZE-1
+                                       if((x==0 || x == MAP_BLOCKSIZE-1
                                        || y==0 || y == MAP_BLOCKSIZE-1
                                        || z==0 || z == MAP_BLOCKSIZE-1)
+                                       && oldlight != 0)
                                        {
-                                               v3s16 p_map = p + v3s16(
-                                                               MAP_BLOCKSIZE*pos.X,
-                                                               MAP_BLOCKSIZE*pos.Y,
-                                                               MAP_BLOCKSIZE*pos.Z);
-                                               unlight_from.insert(p_map, oldlight);
+                                               v3s16 p_map = p + posnodes;
+                                               unlight_from[p_map] = oldlight;
                                        }
                                }
                                catch(InvalidPositionException &e)
@@ -743,6 +751,9 @@ void Map::updateLighting(enum LightBank bank,
                        {
                                bool bottom_valid = block->propagateSunlight(light_sources);
 
+                               if(!bottom_valid)
+                                       num_bottom_invalid++;
+
                                // If bottom is valid, we're done.
                                if(bottom_valid)
                                        break;
@@ -775,7 +786,9 @@ void Map::updateLighting(enum LightBank bank,
 
                }
        }
-       
+
+       }
+
        /*
                Enable this to disable proper lighting for speeding up map
                generation for testing or whatever
@@ -795,38 +808,43 @@ void Map::updateLighting(enum LightBank bank,
        }
 #endif
 
-#if 0
+#if 1
        {
-               TimeTaker timer("unspreadLight");
+               //TimeTaker timer("unspreadLight");
                unspreadLight(bank, unlight_from, light_sources, modified_blocks);
        }
 
-       if(debug)
+       /*if(debug)
        {
                u32 diff = modified_blocks.size() - count_was;
                count_was = modified_blocks.size();
                infostream<<"unspreadLight modified "<<diff<<std::endl;
-       }
+       }*/
 
        {
-               TimeTaker timer("spreadLight");
+               //TimeTaker timer("spreadLight");
                spreadLight(bank, light_sources, modified_blocks);
        }
 
-       if(debug)
+       /*if(debug)
        {
                u32 diff = modified_blocks.size() - count_was;
                count_was = modified_blocks.size();
                infostream<<"spreadLight modified "<<diff<<std::endl;
-       }
+       }*/
 #endif
 
+#if 0
        {
                //MapVoxelManipulator vmanip(this);
 
                // Make a manual voxel manipulator and load all the blocks
                // that touch the requested blocks
                ManualMapVoxelManipulator vmanip(this);
+
+               {
+               //TimeTaker timer("initialEmerge");
+
                core::map<v3s16, MapBlock*>::Iterator i;
                i = blocks_to_update.getIterator();
                for(; i.atEnd() == false; i++)
@@ -846,28 +864,29 @@ void Map::updateLighting(enum LightBank bank,
                        for(s16 y=-1; y<=1; y++)
                        for(s16 x=-1; x<=1; x++)
                        {
-                               v3s16 p(x,y,z);
-                               MapBlock *block = getBlockNoCreateNoEx(p);
+                               v3s16 p2 = p + v3s16(x,y,z);
+                               MapBlock *block = getBlockNoCreateNoEx(p2);
                                if(block == NULL)
                                        continue;
                                if(block->isDummy())
                                        continue;
                                if(block->getLightingExpired())
                                        continue;
-                               vmanip.initialEmerge(p, p);
+                               vmanip.initialEmerge(p2, p2);
                        }*/
 
                        // Lighting of block will be updated completely
                        block->setLightingExpired(false);
                }
+               }
 
                {
                        //TimeTaker timer("unSpreadLight");
-                       vmanip.unspreadLight(bank, unlight_from, light_sources);
+                       vmanip.unspreadLight(bank, unlight_from, light_sources, nodemgr);
                }
                {
                        //TimeTaker timer("spreadLight");
-                       vmanip.spreadLight(bank, light_sources);
+                       vmanip.spreadLight(bank, light_sources, nodemgr);
                }
                {
                        //TimeTaker timer("blitBack");
@@ -876,12 +895,13 @@ void Map::updateLighting(enum LightBank bank,
                /*infostream<<"emerge_time="<<emerge_time<<std::endl;
                emerge_time = 0;*/
        }
+#endif
 
        //m_dout<<"Done ("<<getTimestamp()<<")"<<std::endl;
 }
 
-void Map::updateLighting(core::map<v3s16, MapBlock*> & a_blocks,
-               core::map<v3s16, MapBlock*> & modified_blocks)
+void Map::updateLighting(std::map<v3s16, MapBlock*> & a_blocks,
+               std::map<v3s16, MapBlock*> & modified_blocks)
 {
        updateLighting(LIGHTBANK_DAY, a_blocks, modified_blocks);
        updateLighting(LIGHTBANK_NIGHT, a_blocks, modified_blocks);
@@ -889,20 +909,22 @@ void Map::updateLighting(core::map<v3s16, MapBlock*> & a_blocks,
        /*
                Update information about whether day and night light differ
        */
-       for(core::map<v3s16, MapBlock*>::Iterator
-                       i = modified_blocks.getIterator();
-                       i.atEnd() == false; i++)
+       for(std::map<v3s16, MapBlock*>::iterator
+                       i = modified_blocks.begin();
+                       i != modified_blocks.end(); ++i)
        {
-               MapBlock *block = i.getNode()->getValue();
-               block->updateDayNightDiff();
+               MapBlock *block = i->second;
+               block->expireDayNightDiff();
        }
 }
 
 /*
 */
 void Map::addNodeAndUpdate(v3s16 p, MapNode n,
-               core::map<v3s16, MapBlock*> &modified_blocks, std::string &player_name)
+               std::map<v3s16, MapBlock*> &modified_blocks)
 {
+       INodeDefManager *ndef = m_gamedef->ndef();
+
        /*PrintInfo(m_dout);
        m_dout<<DTIME<<"Map::addNodeAndUpdate(): p=("
                        <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
@@ -915,10 +937,15 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        */
 
        v3s16 toppos = p + v3s16(0,1,0);
-       v3s16 bottompos = p + v3s16(0,-1,0);
+       //v3s16 bottompos = p + v3s16(0,-1,0);
 
        bool node_under_sunlight = true;
-       core::map<v3s16, bool> light_sources;
+       std::set<v3s16> light_sources;
+
+       /*
+               Collect old node for rollback
+       */
+       RollbackNode rollback_oldnode(this, p, m_gamedef);
 
        /*
                If there is a node at top and it doesn't have sunlight,
@@ -929,46 +956,13 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        try{
                MapNode topnode = getNode(toppos);
 
-               if(topnode.getLight(LIGHTBANK_DAY) != LIGHT_SUN)
+               if(topnode.getLight(LIGHTBANK_DAY, ndef) != LIGHT_SUN)
                        node_under_sunlight = false;
        }
        catch(InvalidPositionException &e)
        {
        }
 
-#if 0
-       /*
-               If the new node is solid and there is grass below, change it to mud
-       */
-       if(content_features(n).walkable == true)
-       {
-               try{
-                       MapNode bottomnode = getNode(bottompos);
-
-                       if(bottomnode.getContent() == CONTENT_GRASS
-                                       || bottomnode.getContent() == CONTENT_GRASS_FOOTSTEPS)
-                       {
-                               bottomnode.setContent(CONTENT_MUD);
-                               setNode(bottompos, bottomnode);
-                       }
-               }
-               catch(InvalidPositionException &e)
-               {
-               }
-       }
-#endif
-
-#if 0
-       /*
-               If the new node is mud and it is under sunlight, change it
-               to grass
-       */
-       if(n.getContent() == CONTENT_MUD && node_under_sunlight)
-       {
-               n.setContent(CONTENT_GRASS);
-       }
-#endif
-
        /*
                Remove all light that has come out of this node
        */
@@ -982,13 +976,13 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        {
                enum LightBank bank = banks[i];
 
-               u8 lightwas = getNode(p).getLight(bank);
+               u8 lightwas = getNode(p).getLight(bank, ndef);
 
                // Add the block of the added node to modified_blocks
                v3s16 blockpos = getNodeBlockPos(p);
                MapBlock * block = getBlockNoCreate(blockpos);
                assert(block != NULL);
-               modified_blocks.insert(blockpos, block);
+               modified_blocks[blockpos] = block;
 
                assert(isValidPosition(p));
 
@@ -999,35 +993,29 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                // light again into this.
                unLightNeighbors(bank, p, lightwas, light_sources, modified_blocks);
 
-               n.setLight(bank, 0);
+               n.setLight(bank, 0, ndef);
        }
 
        /*
                If node lets sunlight through and is under sunlight, it has
                sunlight too.
        */
-       if(node_under_sunlight && content_features(n).sunlight_propagates)
+       if(node_under_sunlight && ndef->get(n).sunlight_propagates)
        {
-               n.setLight(LIGHTBANK_DAY, LIGHT_SUN);
+               n.setLight(LIGHTBANK_DAY, LIGHT_SUN, ndef);
        }
 
        /*
-               Set the node on the map
+               Remove node metadata
        */
 
-       setNode(p, n);
+       removeNodeMetadata(p);
 
        /*
-               Add intial metadata
+               Set the node on the map
        */
 
-       NodeMetadata *meta_proto = content_features(n).initial_metadata;
-       if(meta_proto)
-       {
-               NodeMetadata *meta = meta_proto->clone();
-               meta->setOwner(player_name);
-               setNodeMetadata(p, meta);
-       }
+       setNode(p, n);
 
        /*
                If node is under sunlight and doesn't let sunlight through,
@@ -1036,7 +1024,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                TODO: This could be optimized by mass-unlighting instead
                          of looping
        */
-       if(node_under_sunlight && !content_features(n).sunlight_propagates)
+       if(node_under_sunlight && !ndef->get(n).sunlight_propagates)
        {
                s16 y = p.Y - 1;
                for(;; y--){
@@ -1052,12 +1040,12 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                                break;
                        }
 
-                       if(n2.getLight(LIGHTBANK_DAY) == LIGHT_SUN)
+                       if(n2.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
                        {
                                unLightNeighbors(LIGHTBANK_DAY,
-                                               n2pos, n2.getLight(LIGHTBANK_DAY),
+                                               n2pos, n2.getLight(LIGHTBANK_DAY, ndef),
                                                light_sources, modified_blocks);
-                               n2.setLight(LIGHTBANK_DAY, 0);
+                               n2.setLight(LIGHTBANK_DAY, 0, ndef);
                                setNode(n2pos, n2);
                        }
                        else
@@ -1078,12 +1066,22 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        /*
                Update information about whether day and night light differ
        */
-       for(core::map<v3s16, MapBlock*>::Iterator
-                       i = modified_blocks.getIterator();
-                       i.atEnd() == false; i++)
+       for(std::map<v3s16, MapBlock*>::iterator
+                       i = modified_blocks.begin();
+                       i != modified_blocks.end(); ++i)
+       {
+               i->second->expireDayNightDiff();
+       }
+
+       /*
+               Report for rollback
+       */
+       if(m_gamedef->rollback())
        {
-               MapBlock *block = i.getNode()->getValue();
-               block->updateDayNightDiff();
+               RollbackNode rollback_newnode(this, p, m_gamedef);
+               RollbackAction action;
+               action.setSetNode(p, rollback_oldnode, rollback_newnode);
+               m_gamedef->rollback()->reportAction(action);
        }
 
        /*
@@ -1107,7 +1105,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                v3s16 p2 = p + dirs[i];
 
                MapNode n2 = getNode(p2);
-               if(content_liquid(n2.getContent()) || n2.getContent() == CONTENT_AIR)
+               if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
                {
                        m_transforming_liquid.push_back(p2);
                }
@@ -1121,8 +1119,10 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
 /*
 */
 void Map::removeNodeAndUpdate(v3s16 p,
-               core::map<v3s16, MapBlock*> &modified_blocks)
+               std::map<v3s16, MapBlock*> &modified_blocks)
 {
+       INodeDefManager *ndef = m_gamedef->ndef();
+
        /*PrintInfo(m_dout);
        m_dout<<DTIME<<"Map::removeNodeAndUpdate(): p=("
                        <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
@@ -1134,6 +1134,11 @@ void Map::removeNodeAndUpdate(v3s16 p,
        // Node will be replaced with this
        content_t replace_material = CONTENT_AIR;
 
+       /*
+               Collect old node for rollback
+       */
+       RollbackNode rollback_oldnode(this, p, m_gamedef);
+
        /*
                If there is a node at top and it doesn't have sunlight,
                there will be no sunlight going down.
@@ -1141,14 +1146,14 @@ void Map::removeNodeAndUpdate(v3s16 p,
        try{
                MapNode topnode = getNode(toppos);
 
-               if(topnode.getLight(LIGHTBANK_DAY) != LIGHT_SUN)
+               if(topnode.getLight(LIGHTBANK_DAY, ndef) != LIGHT_SUN)
                        node_under_sunlight = false;
        }
        catch(InvalidPositionException &e)
        {
        }
 
-       core::map<v3s16, bool> light_sources;
+       std::set<v3s16> light_sources;
 
        enum LightBank banks[] =
        {
@@ -1163,7 +1168,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                        Unlight neighbors (in case the node is a light source)
                */
                unLightNeighbors(bank, p,
-                               getNode(p).getLight(bank),
+                               getNode(p).getLight(bank, ndef),
                                light_sources, modified_blocks);
        }
 
@@ -1196,7 +1201,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
        v3s16 blockpos = getNodeBlockPos(p);
        MapBlock * block = getBlockNoCreate(blockpos);
        assert(block != NULL);
-       modified_blocks.insert(blockpos, block);
+       modified_blocks[blockpos] = block;
 
        /*
                If the removed node was under sunlight, propagate the
@@ -1225,7 +1230,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                // TODO: Is this needed? Lighting is cleared up there already.
                try{
                        MapNode n = getNode(p);
-                       n.setLight(LIGHTBANK_DAY, 0);
+                       n.setLight(LIGHTBANK_DAY, 0, ndef);
                        setNode(p, n);
                }
                catch(InvalidPositionException &e)
@@ -1241,7 +1246,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                // Get the brightest neighbour node and propagate light from it
                v3s16 n2p = getBrightestNeighbour(bank, p);
                try{
-                       MapNode n2 = getNode(n2p);
+                       //MapNode n2 = getNode(n2p);
                        lightNeighbors(bank, n2p, modified_blocks);
                }
                catch(InvalidPositionException &e)
@@ -1252,12 +1257,22 @@ void Map::removeNodeAndUpdate(v3s16 p,
        /*
                Update information about whether day and night light differ
        */
-       for(core::map<v3s16, MapBlock*>::Iterator
-                       i = modified_blocks.getIterator();
-                       i.atEnd() == false; i++)
+       for(std::map<v3s16, MapBlock*>::iterator
+                       i = modified_blocks.begin();
+                       i != modified_blocks.end(); ++i)
+       {
+               i->second->expireDayNightDiff();
+       }
+
+       /*
+               Report for rollback
+       */
+       if(m_gamedef->rollback())
        {
-               MapBlock *block = i.getNode()->getValue();
-               block->updateDayNightDiff();
+               RollbackNode rollback_newnode(this, p, m_gamedef);
+               RollbackAction action;
+               action.setSetNode(p, rollback_oldnode, rollback_newnode);
+               m_gamedef->rollback()->reportAction(action);
        }
 
        /*
@@ -1281,7 +1296,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                v3s16 p2 = p + dirs[i];
 
                MapNode n2 = getNode(p2);
-               if(content_liquid(n2.getContent()) || n2.getContent() == CONTENT_AIR)
+               if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
                {
                        m_transforming_liquid.push_back(p2);
                }
@@ -1301,16 +1316,15 @@ bool Map::addNodeWithEvent(v3s16 p, MapNode n)
 
        bool succeeded = true;
        try{
-               core::map<v3s16, MapBlock*> modified_blocks;
-               std::string st = std::string("");
-               addNodeAndUpdate(p, n, modified_blocks, st);
+               std::map<v3s16, MapBlock*> modified_blocks;
+               addNodeAndUpdate(p, n, modified_blocks);
 
                // Copy modified_blocks to event
-               for(core::map<v3s16, MapBlock*>::Iterator
-                               i = modified_blocks.getIterator();
-                               i.atEnd()==false; i++)
+               for(std::map<v3s16, MapBlock*>::iterator
+                               i = modified_blocks.begin();
+                               i != modified_blocks.end(); ++i)
                {
-                       event.modified_blocks.insert(i.getNode()->getKey(), false);
+                       event.modified_blocks.insert(i->first);
                }
        }
        catch(InvalidPositionException &e){
@@ -1330,15 +1344,15 @@ bool Map::removeNodeWithEvent(v3s16 p)
 
        bool succeeded = true;
        try{
-               core::map<v3s16, MapBlock*> modified_blocks;
+               std::map<v3s16, MapBlock*> modified_blocks;
                removeNodeAndUpdate(p, modified_blocks);
 
                // Copy modified_blocks to event
-               for(core::map<v3s16, MapBlock*>::Iterator
-                               i = modified_blocks.getIterator();
-                               i.atEnd()==false; i++)
+               for(std::map<v3s16, MapBlock*>::iterator
+                               i = modified_blocks.begin();
+                               i != modified_blocks.end(); ++i)
                {
-                       event.modified_blocks.insert(i.getNode()->getKey(), false);
+                       event.modified_blocks.insert(i->first);
                }
        }
        catch(InvalidPositionException &e){
@@ -1350,12 +1364,12 @@ bool Map::removeNodeWithEvent(v3s16 p)
        return succeeded;
 }
 
-bool Map::dayNightDiffed(v3s16 blockpos)
+bool Map::getDayNightDiff(v3s16 blockpos)
 {
        try{
                v3s16 p = blockpos + v3s16(0,0,0);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
@@ -1363,21 +1377,21 @@ bool Map::dayNightDiffed(v3s16 blockpos)
        try{
                v3s16 p = blockpos + v3s16(-1,0,0);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
        try{
                v3s16 p = blockpos + v3s16(0,-1,0);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
        try{
                v3s16 p = blockpos + v3s16(0,0,-1);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
@@ -1385,21 +1399,21 @@ bool Map::dayNightDiffed(v3s16 blockpos)
        try{
                v3s16 p = blockpos + v3s16(1,0,0);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
        try{
                v3s16 p = blockpos + v3s16(0,1,0);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
        try{
                v3s16 p = blockpos + v3s16(0,0,1);
                MapBlock *b = getBlockNoCreate(p);
-               if(b->dayNightDiffed())
+               if(b->getDayNightDiff())
                        return true;
        }
        catch(InvalidPositionException &e){}
@@ -1411,35 +1425,37 @@ bool Map::dayNightDiffed(v3s16 blockpos)
        Updates usage timers
 */
 void Map::timerUpdate(float dtime, float unload_timeout,
-               core::list<v3s16> *unloaded_blocks)
+               std::list<v3s16> *unloaded_blocks)
 {
        bool save_before_unloading = (mapType() == MAPTYPE_SERVER);
-       
-       core::list<v2s16> sector_deletion_queue;
+
+       // Profile modified reasons
+       Profiler modprofiler;
+
+       std::list<v2s16> sector_deletion_queue;
        u32 deleted_blocks_count = 0;
        u32 saved_blocks_count = 0;
-
-       core::map<v2s16, MapSector*>::Iterator si;
+       u32 block_count_all = 0;
 
        beginSave();
-       si = m_sectors.getIterator();
-       for(; si.atEnd() == false; si++)
+       for(std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
+               si != m_sectors.end(); ++si)
        {
-               MapSector *sector = si.getNode()->getValue();
+               MapSector *sector = si->second;
 
                bool all_blocks_deleted = true;
 
-               core::list<MapBlock*> blocks;
+               std::list<MapBlock*> blocks;
                sector->getBlocks(blocks);
-               
-               for(core::list<MapBlock*>::Iterator i = blocks.begin();
-                               i != blocks.end(); i++)
+
+               for(std::list<MapBlock*>::iterator i = blocks.begin();
+                               i != blocks.end(); ++i)
                {
                        MapBlock *block = (*i);
-                       
+
                        block->incrementUsageTimer(dtime);
-                       
-                       if(block->getUsageTimer() > unload_timeout)
+
+                       if(block->refGet() == 0 && block->getUsageTimer() > unload_timeout)
                        {
                                v3s16 p = block->getPos();
 
@@ -1447,6 +1463,7 @@ void Map::timerUpdate(float dtime, float unload_timeout,
                                if(block->getModified() != MOD_STATE_CLEAN
                                                && save_before_unloading)
                                {
+                                       modprofiler.add(block->getModifiedReason(), 1);
                                        saveBlock(block);
                                        saved_blocks_count++;
                                }
@@ -1462,19 +1479,20 @@ void Map::timerUpdate(float dtime, float unload_timeout,
                        else
                        {
                                all_blocks_deleted = false;
+                               block_count_all++;
                        }
                }
 
                if(all_blocks_deleted)
                {
-                       sector_deletion_queue.push_back(si.getNode()->getKey());
+                       sector_deletion_queue.push_back(si->first);
                }
        }
        endSave();
-       
+
        // Finally delete the empty sectors
        deleteSectors(sector_deletion_queue);
-       
+
        if(deleted_blocks_count != 0)
        {
                PrintInfo(infostream); // ServerMap/ClientMap:
@@ -1482,21 +1500,27 @@ void Map::timerUpdate(float dtime, float unload_timeout,
                                <<" blocks from memory";
                if(save_before_unloading)
                        infostream<<", of which "<<saved_blocks_count<<" were written";
+               infostream<<", "<<block_count_all<<" blocks in memory";
                infostream<<"."<<std::endl;
+               if(saved_blocks_count != 0){
+                       PrintInfo(infostream); // ServerMap/ClientMap:
+                       infostream<<"Blocks modified by: "<<std::endl;
+                       modprofiler.print(infostream);
+               }
        }
 }
 
-void Map::deleteSectors(core::list<v2s16> &list)
+void Map::deleteSectors(std::list<v2s16> &list)
 {
-       core::list<v2s16>::Iterator j;
-       for(j=list.begin(); j!=list.end(); j++)
+       for(std::list<v2s16>::iterator j = list.begin();
+               j != list.end(); ++j)
        {
                MapSector *sector = m_sectors[*j];
                // If sector is in sector cache, remove it from there
                if(m_sector_cache == sector)
                        m_sector_cache = NULL;
                // Remove from map and delete
-               m_sectors.remove(*j);
+               m_sectors.erase(*j);
                delete sector;
        }
 }
@@ -1522,7 +1546,7 @@ void Map::unloadUnusedData(float timeout,
                                i != blocks.end(); i++)
                {
                        MapBlock *block = (*i);
-                       
+
                        if(block->getUsageTimer() > timeout)
                        {
                                // Save if modified
@@ -1574,174 +1598,547 @@ struct NodeNeighbor {
        MapNode n;
        NeighborType t;
        v3s16 p;
+       bool l; //can liquid
+       bool i; //infinity
+};
+
+void Map::transforming_liquid_add(v3s16 p) {
+        m_transforming_liquid.push_back(p);
+}
+
+s32 Map::transforming_liquid_size() {
+        return m_transforming_liquid.size();
+}
+
+const v3s16 g_7dirs[7] =
+{
+       // +right, +top, +back
+       v3s16( 0,-1, 0), // bottom
+       v3s16( 0, 0, 0), // self
+       v3s16( 0, 0, 1), // back
+       v3s16( 0, 0,-1), // front
+       v3s16( 1, 0, 0), // right
+       v3s16(-1, 0, 0), // left
+       v3s16( 0, 1, 0)  // top
 };
 
-void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
+#define D_BOTTOM 0
+#define D_TOP 6
+#define D_SELF 1
+
+void Map::transformLiquidsFinite(std::map<v3s16, MapBlock*> & modified_blocks)
 {
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
        DSTACK(__FUNCTION_NAME);
        //TimeTaker timer("transformLiquids()");
 
        u32 loopcount = 0;
        u32 initial_size = m_transforming_liquid.size();
 
-       /*if(initial_size != 0)
-               infostream<<"transformLiquids(): initial_size="<<initial_size<<std::endl;*/
+       u8 relax = g_settings->getS16("liquid_relax");
+       bool fast_flood = g_settings->getS16("liquid_fast_flood");
+       int water_level = g_settings->getS16("water_level");
 
        // list of nodes that due to viscosity have not reached their max level height
-       UniqueQueue<v3s16> must_reflow;
-       
+       UniqueQueue<v3s16> must_reflow, must_reflow_second;
+
        // List of MapBlocks that will require a lighting update (due to lava)
-       core::map<v3s16, MapBlock*> lighting_modified_blocks;
+       std::map<v3s16, MapBlock*> lighting_modified_blocks;
 
-       while(m_transforming_liquid.size() != 0)
+       while (m_transforming_liquid.size() > 0)
        {
                // This should be done here so that it is done when continue is used
-               if(loopcount >= initial_size * 3)
+               if (loopcount >= initial_size || loopcount >= 1000)
                        break;
                loopcount++;
-
                /*
                        Get a queued transforming liquid node
                */
                v3s16 p0 = m_transforming_liquid.pop_front();
-
-               MapNode n0 = getNodeNoEx(p0);
-
-               /*
-                       Collect information about current node
-                */
-               s8 liquid_level = -1;
-               u8 liquid_kind = CONTENT_IGNORE;
-               LiquidType liquid_type = content_features(n0.getContent()).liquid_type;
-               switch (liquid_type) {
-                       case LIQUID_SOURCE:
-                               liquid_level = LIQUID_LEVEL_SOURCE;
-                               liquid_kind = content_features(n0.getContent()).liquid_alternative_flowing;
-                               break;
-                       case LIQUID_FLOWING:
-                               liquid_level = (n0.param2 & LIQUID_LEVEL_MASK);
-                               liquid_kind = n0.getContent();
-                               break;
-                       case LIQUID_NONE:
-                               // if this is an air node, it *could* be transformed into a liquid. otherwise,
-                               // continue with the next node.
-                               if (n0.getContent() != CONTENT_AIR)
-                                       continue;
-                               liquid_kind = CONTENT_AIR;
-                               break;
-               }
-
+               u16 total_level = 0;
+               // surrounding flowing liquid nodes
+               NodeNeighbor neighbors[7]; 
+               // current level of every block
+               s8 liquid_levels[7] = {-1, -1, -1, -1, -1, -1, -1};
+                // target levels
+               s8 liquid_levels_want[7] = {-1, -1, -1, -1, -1, -1, -1};
+               s8 can_liquid_same_level = 0;
+               content_t liquid_kind = CONTENT_IGNORE;
+               content_t liquid_kind_flowing = CONTENT_IGNORE;
                /*
                        Collect information about the environment
                 */
-               const v3s16 *dirs = g_6dirs;
-               NodeNeighbor sources[6]; // surrounding sources
-               int num_sources = 0;
-               NodeNeighbor flows[6]; // surrounding flowing liquid nodes
-               int num_flows = 0;
-               NodeNeighbor airs[6]; // surrounding air
-               int num_airs = 0;
-               NodeNeighbor neutrals[6]; // nodes that are solid or another kind of liquid
-               int num_neutrals = 0;
-               bool flowing_down = false;
-               for (u16 i = 0; i < 6; i++) {
+               const v3s16 *dirs = g_7dirs;
+               for (u16 i = 0; i < 7; i++) {
                        NeighborType nt = NEIGHBOR_SAME_LEVEL;
                        switch (i) {
-                               case 1:
+                               case D_TOP:
                                        nt = NEIGHBOR_UPPER;
                                        break;
-                               case 4:
+                               case D_BOTTOM:
                                        nt = NEIGHBOR_LOWER;
                                        break;
                        }
                        v3s16 npos = p0 + dirs[i];
-                       NodeNeighbor nb = {getNodeNoEx(npos), nt, npos};
-                       switch (content_features(nb.n.getContent()).liquid_type) {
+
+                       neighbors[i].n = getNodeNoEx(npos);
+                       neighbors[i].t = nt;
+                       neighbors[i].p = npos;
+                       neighbors[i].l = 0;
+                       neighbors[i].i = 0;
+                       NodeNeighbor & nb = neighbors[i];
+
+                       switch (nodemgr->get(nb.n.getContent()).liquid_type) {
                                case LIQUID_NONE:
                                        if (nb.n.getContent() == CONTENT_AIR) {
-                                               airs[num_airs++] = nb;
-                                               // if the current node is a water source the neighbor
-                                               // should be enqueded for transformation regardless of whether the
-                                               // current node changes or not.
-                                               if (nb.t != NEIGHBOR_UPPER && liquid_type != LIQUID_NONE)
-                                                       m_transforming_liquid.push_back(npos);
-                                               // if the current node happens to be a flowing node, it will start to flow down here.
-                                               if (nb.t == NEIGHBOR_LOWER) {
-                                                       flowing_down = true;
-                                               }
-                                       } else {
-                                               neutrals[num_neutrals++] = nb;
+                                               liquid_levels[i] = 0;
+                                               nb.l = 1;
                                        }
                                        break;
                                case LIQUID_SOURCE:
-                                       // if this node is not (yet) of a liquid type, choose the first liquid type we encounter 
-                                       if (liquid_kind == CONTENT_AIR)
-                                               liquid_kind = content_features(nb.n.getContent()).liquid_alternative_flowing;
-                                       if (content_features(nb.n.getContent()).liquid_alternative_flowing !=liquid_kind) {
-                                               neutrals[num_neutrals++] = nb;
-                                       } else {
-                                               sources[num_sources++] = nb;
+                                       // if this node is not (yet) of a liquid type,
+                                       // choose the first liquid type we encounter
+                                       if (liquid_kind_flowing == CONTENT_IGNORE)
+                                               liquid_kind_flowing = nodemgr->getId(
+                                                       nodemgr->get(nb.n).liquid_alternative_flowing);
+                                       if (liquid_kind == CONTENT_IGNORE)
+                                               liquid_kind = nb.n.getContent();
+                                       if (nb.n.getContent() == liquid_kind) {
+                                               liquid_levels[i] = LIQUID_LEVEL_SOURCE;
+                                               nb.l = 1;
+                                               nb.i = (nb.n.param2 & LIQUID_INFINITY_MASK);
                                        }
                                        break;
                                case LIQUID_FLOWING:
-                                       // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
-                                       if (liquid_kind == CONTENT_AIR)
-                                               liquid_kind = content_features(nb.n.getContent()).liquid_alternative_flowing;
-                                       if (content_features(nb.n.getContent()).liquid_alternative_flowing != liquid_kind) {
-                                               neutrals[num_neutrals++] = nb;
-                                       } else {
-                                               flows[num_flows++] = nb;
-                                               if (nb.t == NEIGHBOR_LOWER)
-                                                       flowing_down = true;
+                                       // if this node is not (yet) of a liquid type,
+                                       // choose the first liquid type we encounter
+                                       if (liquid_kind_flowing == CONTENT_IGNORE)
+                                               liquid_kind_flowing = nb.n.getContent();
+                                       if (liquid_kind == CONTENT_IGNORE)
+                                               liquid_kind = nodemgr->getId(
+                                                       nodemgr->get(nb.n).liquid_alternative_source);
+                                       if (nb.n.getContent() == liquid_kind_flowing) {
+                                               liquid_levels[i] = (nb.n.param2 & LIQUID_LEVEL_MASK);
+                                               nb.l = 1;
                                        }
                                        break;
                        }
+                       
+                       if (nb.l && nb.t == NEIGHBOR_SAME_LEVEL)
+                               ++can_liquid_same_level;
+                       if (liquid_levels[i] > 0)
+                               total_level += liquid_levels[i];
+
+                       /*
+                       infostream << "get node i=" <<(int)i<<" " << PP(npos) << " c="
+                       << nb.n.getContent() <<" p0="<< (int)nb.n.param0 <<" p1="
+                       << (int)nb.n.param1 <<" p2="<< (int)nb.n.param2 << " lt="
+                       << nodemgr->get(nb.n.getContent()).liquid_type
+                       //<< " lk=" << liquid_kind << " lkf=" << liquid_kind_flowing
+                       << " l="<< nb.l << " inf="<< nb.i << " nlevel=" << (int)liquid_levels[i]
+                       << " tlevel=" << (int)total_level << " cansame="
+                       << (int)can_liquid_same_level << std::endl;
+                       */
                }
 
-               /*
-                       decide on the type (and possibly level) of the current node
-                */
-               content_t new_node_content;
-               s8 new_node_level = -1;
-               s8 max_node_level = -1;
-               if (num_sources >= 2 || liquid_type == LIQUID_SOURCE) {
-                       // liquid_kind will be set to either the flowing alternative of the node (if it's a liquid)
-                       // or the flowing alternative of the first of the surrounding sources (if it's air), so
-                       // it's perfectly safe to use liquid_kind here to determine the new node content.
-                       new_node_content = content_features(liquid_kind).liquid_alternative_source;
-               } else if (num_sources == 1 && sources[0].t != NEIGHBOR_LOWER) {
-                       // liquid_kind is set properly, see above
-                       new_node_content = liquid_kind;
-                       max_node_level = new_node_level = LIQUID_LEVEL_MAX;
-               } else {
-                       // no surrounding sources, so get the maximum level that can flow into this node
-                       for (u16 i = 0; i < num_flows; i++) {
-                               u8 nb_liquid_level = (flows[i].n.param2 & LIQUID_LEVEL_MASK);
-                               switch (flows[i].t) {
-                                       case NEIGHBOR_UPPER:
-                                               if (nb_liquid_level + WATER_DROP_BOOST > max_node_level) {
-                                                       max_node_level = LIQUID_LEVEL_MAX;
-                                                       if (nb_liquid_level + WATER_DROP_BOOST < LIQUID_LEVEL_MAX)
-                                                               max_node_level = nb_liquid_level + WATER_DROP_BOOST;
-                                               } else if (nb_liquid_level > max_node_level)
-                                                       max_node_level = nb_liquid_level;
-                                               break;
-                                       case NEIGHBOR_LOWER:
-                                               break;
-                                       case NEIGHBOR_SAME_LEVEL:
-                                               if ((flows[i].n.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK &&
-                                                       nb_liquid_level > 0 && nb_liquid_level - 1 > max_node_level) {
-                                                       max_node_level = nb_liquid_level - 1;
-                                               }
-                                               break;
-                               }
-                       }
+               if (liquid_kind == CONTENT_IGNORE ||
+                       !neighbors[D_SELF].l ||
+                       total_level <= 0)
+                       continue;
 
-                       u8 viscosity = content_features(liquid_kind).liquid_viscosity;
-                       if (viscosity > 1 && max_node_level != liquid_level) {
-                               // amount to gain, limited by viscosity
-                               // must be at least 1 in absolute value
-                               s8 level_inc = max_node_level - liquid_level;
+               // fill bottom block
+               if (neighbors[D_BOTTOM].l) {
+                       liquid_levels_want[D_BOTTOM] = total_level > LIQUID_LEVEL_SOURCE ?
+                               LIQUID_LEVEL_SOURCE : total_level;
+                       total_level -= liquid_levels_want[D_BOTTOM];
+               }
+
+               //relax up
+               if (relax && ((p0.Y == water_level) || (fast_flood && p0.Y <= water_level)) && liquid_levels[D_TOP] == 0 &&
+                       liquid_levels[D_BOTTOM] == LIQUID_LEVEL_SOURCE &&
+                       total_level >= LIQUID_LEVEL_SOURCE * can_liquid_same_level-
+                       (can_liquid_same_level - relax) &&
+                       can_liquid_same_level >= relax + 1) { 
+                       total_level = LIQUID_LEVEL_SOURCE * can_liquid_same_level; 
+               }
+
+               // prevent lakes in air above unloaded blocks
+               if (liquid_levels[D_TOP] == 0 && (p0.Y > water_level || !fast_flood) && neighbors[D_BOTTOM].n.getContent() == CONTENT_IGNORE) {
+                       --total_level;
+               }
+
+               // calculate self level 5 blocks
+               u8 want_level = 
+                         total_level >= LIQUID_LEVEL_SOURCE * can_liquid_same_level
+                       ? LIQUID_LEVEL_SOURCE 
+                       : total_level / can_liquid_same_level;
+               total_level -= want_level * can_liquid_same_level;
+
+               //relax down
+               if (relax && p0.Y == water_level + 1 && liquid_levels[D_TOP] == 0 &&
+                       liquid_levels[D_BOTTOM] == LIQUID_LEVEL_SOURCE && want_level == 0 &&
+                       total_level <= (can_liquid_same_level - relax) &&
+                       can_liquid_same_level >= relax + 1) {
+                       total_level = 0;
+               }
+
+               for (u16 ii = D_SELF; ii < D_TOP; ++ii) { // fill only same level
+                       if (!neighbors[ii].l)
+                               continue;
+                       liquid_levels_want[ii] = want_level;
+                       if (liquid_levels_want[ii] < LIQUID_LEVEL_SOURCE && total_level > 0
+                               && liquid_levels[ii] > liquid_levels_want[ii]
+                               ) {
+                               ++liquid_levels_want[ii];
+                               --total_level;
+                       }
+               }
+
+               for (u16 ii = 0; ii < 7; ++ii) {
+                       if (total_level < 1) break;
+                       if (liquid_levels_want[ii] >= 0 &&
+                               liquid_levels_want[ii] < LIQUID_LEVEL_SOURCE) {
+                               ++liquid_levels_want[ii];
+                               --total_level;
+                       }
+               }
+
+               // fill top block if can
+               if (neighbors[D_TOP].l) {
+                       liquid_levels_want[D_TOP] = total_level > LIQUID_LEVEL_SOURCE ?
+                               LIQUID_LEVEL_SOURCE : total_level;
+                       total_level -= liquid_levels_want[D_TOP];
+               }
+
+               for (u16 ii = 0; ii < 7; ii++) // infinity and cave flood optimization
+                       if (    neighbors[ii].i ||
+                               (liquid_levels_want[ii] >= 0 &&
+                                (fast_flood && p0.Y < water_level &&
+                                 (initial_size >= 1000
+                                  && ii != D_TOP
+                                  && want_level >= LIQUID_LEVEL_SOURCE/4
+                                  && can_liquid_same_level >= 5
+                                  && liquid_levels[D_TOP] >= LIQUID_LEVEL_SOURCE))))
+                               liquid_levels_want[ii] = LIQUID_LEVEL_SOURCE;
+
+               /*
+               if (total_level > 0) //|| flowed != volume)
+                       infostream <<" AFTER level=" << (int)total_level 
+                       //<< " flowed="<<flowed<< " volume=" << volume
+                       << " wantsame="<<(int)want_level<< " top="
+                       << (int)liquid_levels_want[D_TOP]<< " topwas="
+                       << (int)liquid_levels[D_TOP]<< " bot="
+                       << (int)liquid_levels_want[D_BOTTOM]<<std::endl;
+               */
+
+               u8 changed = 0;
+               for (u16 i = 0; i < 7; i++) {
+                       if (liquid_levels_want[i] < 0 || !neighbors[i].l) 
+                               continue;
+                       MapNode & n0 = neighbors[i].n;
+                       p0 = neighbors[i].p;
+                       /*
+                               decide on the type (and possibly level) of the current node
+                       */
+                       content_t new_node_content;
+                       s8 new_node_level = -1;
+                       u8 viscosity = nodemgr->get(liquid_kind).liquid_viscosity;
+                       if (viscosity > 1 && liquid_levels_want[i] != liquid_levels[i]) {
+                               // amount to gain, limited by viscosity
+                               // must be at least 1 in absolute value
+                               s8 level_inc = liquid_levels_want[i] - liquid_levels[i];
+                               if (level_inc < -viscosity || level_inc > viscosity)
+                                       new_node_level = liquid_levels[i] + level_inc/viscosity;
+                               else if (level_inc < 0)
+                                       new_node_level = liquid_levels[i] - 1;
+                               else if (level_inc > 0)
+                                       new_node_level = liquid_levels[i] + 1;
+                       } else {
+                               new_node_level = liquid_levels_want[i];
+                       }
+                       
+                       if (new_node_level >= LIQUID_LEVEL_SOURCE)
+                               new_node_content = liquid_kind;
+                       else if (new_node_level > 0)
+                               new_node_content = liquid_kind_flowing;
+                       else
+                               new_node_content = CONTENT_AIR;
+
+                       // last level must flow down on stairs
+                       if (liquid_levels_want[i] != liquid_levels[i] &&
+                               liquid_levels[D_TOP] <= 0 && !neighbors[D_BOTTOM].l &&
+                               new_node_level >= 1 && new_node_level <= 2) {
+                               for (u16 ii = D_SELF + 1; ii < D_TOP; ++ii) { // only same level
+                                       if (neighbors[ii].l)
+                                               must_reflow_second.push_back(p0 + dirs[ii]);
+                               }
+                       }
+
+                       /*
+                               check if anything has changed.
+                               if not, just continue with the next node.
+                        */
+                       if (
+                                new_node_content == n0.getContent() 
+                               && (nodemgr->get(n0.getContent()).liquid_type != LIQUID_FLOWING ||
+                                ((n0.param2 & LIQUID_LEVEL_MASK) == (u8)new_node_level 
+                                //&& ((n0.param2 & LIQUID_FLOW_DOWN_MASK) ==
+                                //LIQUID_FLOW_DOWN_MASK) == flowing_down
+                                ))
+                               &&
+                                (nodemgr->get(n0.getContent()).liquid_type != LIQUID_SOURCE ||
+                                (((n0.param2 & LIQUID_INFINITY_MASK) ==
+                                       LIQUID_INFINITY_MASK) == neighbors[i].i
+                                ))
+                          ) {
+                               continue;
+                       }
+                       ++changed;
+
+                       /*
+                               update the current node
+                        */
+                       if (nodemgr->get(new_node_content).liquid_type == LIQUID_FLOWING) {
+                               // set level to last 3 bits, flowing down bit to 4th bit
+                               n0.param2 = (new_node_level & LIQUID_LEVEL_MASK);
+                       } else if (nodemgr->get(new_node_content).liquid_type == LIQUID_SOURCE) {
+                               //n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
+                               n0.param2 = (neighbors[i].i ? LIQUID_INFINITY_MASK : 0x00);
+                       }
+                       /*
+                       infostream << "set node i=" <<(int)i<<" "<< PP(p0)<< " nc="
+                       <<new_node_content<< " p2="<<(int)n0.param2<< " nl="
+                       <<(int)new_node_level<<std::endl;
+                       */
+                       
+                       n0.setContent(new_node_content);
+                       // Find out whether there is a suspect for this action
+                       std::string suspect;
+                       if(m_gamedef->rollback()){
+                               suspect = m_gamedef->rollback()->getSuspect(p0, 83, 1);
+                       }
+
+                       if(!suspect.empty()){
+                               // Blame suspect
+                               RollbackScopeActor rollback_scope(m_gamedef->rollback(), suspect, true);
+                               // Get old node for rollback
+                               RollbackNode rollback_oldnode(this, p0, m_gamedef);
+                               // Set node
+                               setNode(p0, n0);
+                               // Report
+                               RollbackNode rollback_newnode(this, p0, m_gamedef);
+                               RollbackAction action;
+                               action.setSetNode(p0, rollback_oldnode, rollback_newnode);
+                               m_gamedef->rollback()->reportAction(action);
+                       } else {
+                               // Set node
+                               setNode(p0, n0);
+                       }
+
+                       v3s16 blockpos = getNodeBlockPos(p0);
+                       MapBlock *block = getBlockNoCreateNoEx(blockpos);
+                       if(block != NULL) {
+                               modified_blocks[blockpos] = block;
+                               // If node emits light, MapBlock requires lighting update
+                               if(nodemgr->get(n0).light_source != 0)
+                                       lighting_modified_blocks[block->getPos()] = block;
+                       }
+                       must_reflow.push_back(neighbors[i].p);
+               }
+               /* //for better relax  only same level
+               if (changed)  for (u16 ii = D_SELF + 1; ii < D_TOP; ++ii) {
+                       if (!neighbors[ii].l) continue;
+                       must_reflow.push_back(p0 + dirs[ii]);
+               }*/
+       }
+       /*
+       if (loopcount)
+               infostream<<"Map::transformLiquids(): loopcount="<<loopcount
+               <<" reflow="<<must_reflow.size()
+               <<" queue="<< m_transforming_liquid.size()<<std::endl;
+       */
+       while (must_reflow.size() > 0)
+               m_transforming_liquid.push_back(must_reflow.pop_front());
+       while (must_reflow_second.size() > 0)
+               m_transforming_liquid.push_back(must_reflow_second.pop_front());
+       updateLighting(lighting_modified_blocks, modified_blocks);
+}
+
+void Map::transformLiquids(std::map<v3s16, MapBlock*> & modified_blocks)
+{
+
+       if (g_settings->getBool("liquid_finite"))
+               return Map::transformLiquidsFinite(modified_blocks);
+
+       INodeDefManager *nodemgr = m_gamedef->ndef();
+
+       DSTACK(__FUNCTION_NAME);
+       //TimeTaker timer("transformLiquids()");
+
+       u32 loopcount = 0;
+       u32 initial_size = m_transforming_liquid.size();
+
+       /*if(initial_size != 0)
+               infostream<<"transformLiquids(): initial_size="<<initial_size<<std::endl;*/
+
+       // list of nodes that due to viscosity have not reached their max level height
+       UniqueQueue<v3s16> must_reflow;
+
+       // List of MapBlocks that will require a lighting update (due to lava)
+       std::map<v3s16, MapBlock*> lighting_modified_blocks;
+
+       while(m_transforming_liquid.size() != 0)
+       {
+               // This should be done here so that it is done when continue is used
+               if(loopcount >= initial_size || loopcount >= 10000)
+                       break;
+               loopcount++;
+
+               /*
+                       Get a queued transforming liquid node
+               */
+               v3s16 p0 = m_transforming_liquid.pop_front();
+
+               MapNode n0 = getNodeNoEx(p0);
+
+               /*
+                       Collect information about current node
+                */
+               s8 liquid_level = -1;
+               content_t liquid_kind = CONTENT_IGNORE;
+               LiquidType liquid_type = nodemgr->get(n0).liquid_type;
+               switch (liquid_type) {
+                       case LIQUID_SOURCE:
+                               liquid_level = LIQUID_LEVEL_SOURCE;
+                               liquid_kind = nodemgr->getId(nodemgr->get(n0).liquid_alternative_flowing);
+                               break;
+                       case LIQUID_FLOWING:
+                               liquid_level = (n0.param2 & LIQUID_LEVEL_MASK);
+                               liquid_kind = n0.getContent();
+                               break;
+                       case LIQUID_NONE:
+                               // if this is an air node, it *could* be transformed into a liquid. otherwise,
+                               // continue with the next node.
+                               if (n0.getContent() != CONTENT_AIR)
+                                       continue;
+                               liquid_kind = CONTENT_AIR;
+                               break;
+               }
+
+               /*
+                       Collect information about the environment
+                */
+               const v3s16 *dirs = g_6dirs;
+               NodeNeighbor sources[6]; // surrounding sources
+               int num_sources = 0;
+               NodeNeighbor flows[6]; // surrounding flowing liquid nodes
+               int num_flows = 0;
+               NodeNeighbor airs[6]; // surrounding air
+               int num_airs = 0;
+               NodeNeighbor neutrals[6]; // nodes that are solid or another kind of liquid
+               int num_neutrals = 0;
+               bool flowing_down = false;
+               for (u16 i = 0; i < 6; i++) {
+                       NeighborType nt = NEIGHBOR_SAME_LEVEL;
+                       switch (i) {
+                               case 1:
+                                       nt = NEIGHBOR_UPPER;
+                                       break;
+                               case 4:
+                                       nt = NEIGHBOR_LOWER;
+                                       break;
+                       }
+                       v3s16 npos = p0 + dirs[i];
+                       NodeNeighbor nb = {getNodeNoEx(npos), nt, npos};
+                       switch (nodemgr->get(nb.n.getContent()).liquid_type) {
+                               case LIQUID_NONE:
+                                       if (nb.n.getContent() == CONTENT_AIR) {
+                                               airs[num_airs++] = nb;
+                                               // if the current node is a water source the neighbor
+                                               // should be enqueded for transformation regardless of whether the
+                                               // current node changes or not.
+                                               if (nb.t != NEIGHBOR_UPPER && liquid_type != LIQUID_NONE)
+                                                       m_transforming_liquid.push_back(npos);
+                                               // if the current node happens to be a flowing node, it will start to flow down here.
+                                               if (nb.t == NEIGHBOR_LOWER) {
+                                                       flowing_down = true;
+                                               }
+                                       } else {
+                                               neutrals[num_neutrals++] = nb;
+                                       }
+                                       break;
+                               case LIQUID_SOURCE:
+                                       // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
+                                       if (liquid_kind == CONTENT_AIR)
+                                               liquid_kind = nodemgr->getId(nodemgr->get(nb.n).liquid_alternative_flowing);
+                                       if (nodemgr->getId(nodemgr->get(nb.n).liquid_alternative_flowing) != liquid_kind) {
+                                               neutrals[num_neutrals++] = nb;
+                                       } else {
+                                               // Do not count bottom source, it will screw things up
+                                               if(dirs[i].Y != -1)
+                                                       sources[num_sources++] = nb;
+                                       }
+                                       break;
+                               case LIQUID_FLOWING:
+                                       // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
+                                       if (liquid_kind == CONTENT_AIR)
+                                               liquid_kind = nodemgr->getId(nodemgr->get(nb.n).liquid_alternative_flowing);
+                                       if (nodemgr->getId(nodemgr->get(nb.n).liquid_alternative_flowing) != liquid_kind) {
+                                               neutrals[num_neutrals++] = nb;
+                                       } else {
+                                               flows[num_flows++] = nb;
+                                               if (nb.t == NEIGHBOR_LOWER)
+                                                       flowing_down = true;
+                                       }
+                                       break;
+                       }
+               }
+
+               /*
+                       decide on the type (and possibly level) of the current node
+                */
+               content_t new_node_content;
+               s8 new_node_level = -1;
+               s8 max_node_level = -1;
+               if ((num_sources >= 2 && nodemgr->get(liquid_kind).liquid_renewable) || liquid_type == LIQUID_SOURCE) {
+                       // liquid_kind will be set to either the flowing alternative of the node (if it's a liquid)
+                       // or the flowing alternative of the first of the surrounding sources (if it's air), so
+                       // it's perfectly safe to use liquid_kind here to determine the new node content.
+                       new_node_content = nodemgr->getId(nodemgr->get(liquid_kind).liquid_alternative_source);
+               } else if (num_sources >= 1 && sources[0].t != NEIGHBOR_LOWER) {
+                       // liquid_kind is set properly, see above
+                       new_node_content = liquid_kind;
+                       max_node_level = new_node_level = LIQUID_LEVEL_MAX;
+               } else {
+                       // no surrounding sources, so get the maximum level that can flow into this node
+                       for (u16 i = 0; i < num_flows; i++) {
+                               u8 nb_liquid_level = (flows[i].n.param2 & LIQUID_LEVEL_MASK);
+                               switch (flows[i].t) {
+                                       case NEIGHBOR_UPPER:
+                                               if (nb_liquid_level + WATER_DROP_BOOST > max_node_level) {
+                                                       max_node_level = LIQUID_LEVEL_MAX;
+                                                       if (nb_liquid_level + WATER_DROP_BOOST < LIQUID_LEVEL_MAX)
+                                                               max_node_level = nb_liquid_level + WATER_DROP_BOOST;
+                                               } else if (nb_liquid_level > max_node_level)
+                                                       max_node_level = nb_liquid_level;
+                                               break;
+                                       case NEIGHBOR_LOWER:
+                                               break;
+                                       case NEIGHBOR_SAME_LEVEL:
+                                               if ((flows[i].n.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK &&
+                                                       nb_liquid_level > 0 && nb_liquid_level - 1 > max_node_level) {
+                                                       max_node_level = nb_liquid_level - 1;
+                                               }
+                                               break;
+                               }
+                       }
+
+                       u8 viscosity = nodemgr->get(liquid_kind).liquid_viscosity;
+                       if (viscosity > 1 && max_node_level != liquid_level) {
+                               // amount to gain, limited by viscosity
+                               // must be at least 1 in absolute value
+                               s8 level_inc = max_node_level - liquid_level;
                                if (level_inc < -viscosity || level_inc > viscosity)
                                        new_node_level = liquid_level + level_inc/viscosity;
                                else if (level_inc < 0)
@@ -1763,7 +2160,7 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                /*
                        check if anything has changed. if not, just continue with the next node.
                 */
-               if (new_node_content == n0.getContent() && (content_features(n0.getContent()).liquid_type != LIQUID_FLOWING ||
+               if (new_node_content == n0.getContent() && (nodemgr->get(n0.getContent()).liquid_type != LIQUID_FLOWING ||
                                                                                 ((n0.param2 & LIQUID_LEVEL_MASK) == (u8)new_node_level &&
                                                                                 ((n0.param2 & LIQUID_FLOW_DOWN_MASK) == LIQUID_FLOW_DOWN_MASK)
                                                                                 == flowing_down)))
@@ -1773,8 +2170,8 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                /*
                        update the current node
                 */
-               bool flow_down_enabled = (flowing_down && ((n0.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK));
-               if (content_features(new_node_content).liquid_type == LIQUID_FLOWING) {
+               //bool flow_down_enabled = (flowing_down && ((n0.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK));
+               if (nodemgr->get(new_node_content).liquid_type == LIQUID_FLOWING) {
                        // set level to last 3 bits, flowing down bit to 4th bit
                        n0.param2 = (flowing_down ? LIQUID_FLOW_DOWN_MASK : 0x00) | (new_node_level & LIQUID_LEVEL_MASK);
                } else {
@@ -1782,20 +2179,43 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                        n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
                }
                n0.setContent(new_node_content);
-               setNode(p0, n0);
+
+               // Find out whether there is a suspect for this action
+               std::string suspect;
+               if(m_gamedef->rollback()){
+                       suspect = m_gamedef->rollback()->getSuspect(p0, 83, 1);
+               }
+
+               if(!suspect.empty()){
+                       // Blame suspect
+                       RollbackScopeActor rollback_scope(m_gamedef->rollback(), suspect, true);
+                       // Get old node for rollback
+                       RollbackNode rollback_oldnode(this, p0, m_gamedef);
+                       // Set node
+                       setNode(p0, n0);
+                       // Report
+                       RollbackNode rollback_newnode(this, p0, m_gamedef);
+                       RollbackAction action;
+                       action.setSetNode(p0, rollback_oldnode, rollback_newnode);
+                       m_gamedef->rollback()->reportAction(action);
+               } else {
+                       // Set node
+                       setNode(p0, n0);
+               }
+
                v3s16 blockpos = getNodeBlockPos(p0);
                MapBlock *block = getBlockNoCreateNoEx(blockpos);
                if(block != NULL) {
-                       modified_blocks.insert(blockpos, block);
+                       modified_blocks[blockpos] =  block;
                        // If node emits light, MapBlock requires lighting update
-                       if(content_features(n0).light_source != 0)
+                       if(nodemgr->get(n0).light_source != 0)
                                lighting_modified_blocks[block->getPos()] = block;
                }
 
                /*
                        enqueue neighbors for update if neccessary
                 */
-               switch (content_features(n0.getContent()).liquid_type) {
+               switch (nodemgr->get(n0.getContent()).liquid_type) {
                        case LIQUID_SOURCE:
                        case LIQUID_FLOWING:
                                // make sure source flows into all neighboring nodes
@@ -1872,61 +2292,86 @@ void Map::removeNodeMetadata(v3s16 p)
        block->m_node_metadata.remove(p_rel);
 }
 
-void Map::nodeMetadataStep(float dtime,
-               core::map<v3s16, MapBlock*> &changed_blocks)
+NodeTimer Map::getNodeTimer(v3s16 p)
 {
-       /*
-               NOTE:
-               Currently there is no way to ensure that all the necessary
-               blocks are loaded when this is run. (They might get unloaded)
-               NOTE: ^- Actually, that might not be so. In a quick test it
-               reloaded a block with a furnace when I walked back to it from
-               a distance.
-       */
-       core::map<v2s16, MapSector*>::Iterator si;
-       si = m_sectors.getIterator();
-       for(; si.atEnd() == false; si++)
+       v3s16 blockpos = getNodeBlockPos(p);
+       v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
+       MapBlock *block = getBlockNoCreateNoEx(blockpos);
+       if(!block){
+               infostream<<"Map::getNodeTimer(): Need to emerge "
+                               <<PP(blockpos)<<std::endl;
+               block = emergeBlock(blockpos, false);
+       }
+       if(!block)
        {
-               MapSector *sector = si.getNode()->getValue();
-               core::list< MapBlock * > sectorblocks;
-               sector->getBlocks(sectorblocks);
-               core::list< MapBlock * >::Iterator i;
-               for(i=sectorblocks.begin(); i!=sectorblocks.end(); i++)
-               {
-                       MapBlock *block = *i;
-                       bool changed = block->m_node_metadata.step(dtime);
-                       if(changed)
-                               changed_blocks[block->getPos()] = block;
-               }
+               infostream<<"WARNING: Map::getNodeTimer(): Block not found"
+                               <<std::endl;
+               return NodeTimer();
        }
+       NodeTimer t = block->m_node_timers.get(p_rel);
+       return t;
 }
 
-/*
-       ServerMap
-*/
-
-ServerMap::ServerMap(std::string savedir):
-       Map(dout_server),
-       m_seed(0),
-       m_map_metadata_changed(true),
-       m_database(NULL),
-       m_database_read(NULL),
-       m_database_write(NULL)
+void Map::setNodeTimer(v3s16 p, NodeTimer t)
 {
-       infostream<<__FUNCTION_NAME<<std::endl;
-
-       //m_chunksize = 8; // Takes a few seconds
-
-       if (g_settings->get("fixed_map_seed").empty())
-       {
-               m_seed = (((u64)(myrand()%0xffff)<<0)
-                               + ((u64)(myrand()%0xffff)<<16)
-                               + ((u64)(myrand()%0xffff)<<32)
-                               + ((u64)(myrand()%0xffff)<<48));
+       v3s16 blockpos = getNodeBlockPos(p);
+       v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
+       MapBlock *block = getBlockNoCreateNoEx(blockpos);
+       if(!block){
+               infostream<<"Map::setNodeTimer(): Need to emerge "
+                               <<PP(blockpos)<<std::endl;
+               block = emergeBlock(blockpos, false);
        }
-       else
+       if(!block)
+       {
+               infostream<<"WARNING: Map::setNodeTimer(): Block not found"
+                               <<std::endl;
+               return;
+       }
+       block->m_node_timers.set(p_rel, t);
+}
+
+void Map::removeNodeTimer(v3s16 p)
+{
+       v3s16 blockpos = getNodeBlockPos(p);
+       v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
+       MapBlock *block = getBlockNoCreateNoEx(blockpos);
+       if(block == NULL)
        {
-               m_seed = g_settings->getU64("fixed_map_seed");
+               infostream<<"WARNING: Map::removeNodeTimer(): Block not found"
+                               <<std::endl;
+               return;
+       }
+       block->m_node_timers.remove(p_rel);
+}
+
+/*
+       ServerMap
+*/
+ServerMap::ServerMap(std::string savedir, IGameDef *gamedef, EmergeManager *emerge):
+       Map(dout_server, gamedef),
+       m_seed(0),
+       m_map_metadata_changed(true),
+       m_database(NULL),
+       m_database_read(NULL),
+       m_database_write(NULL)
+{
+       verbosestream<<__FUNCTION_NAME<<std::endl;
+
+       m_emerge = emerge;
+       m_mgparams = m_emerge->getParamsFromSettings(g_settings);
+       if (!m_mgparams)
+               m_mgparams = new MapgenV6Params();
+
+       m_seed = m_mgparams->seed;
+
+       if (g_settings->get("fixed_map_seed").empty())
+       {
+               m_seed = (((u64)(myrand() & 0xffff) << 0)
+                               | ((u64)(myrand() & 0xffff) << 16)
+                               | ((u64)(myrand() & 0xffff) << 32)
+                               | ((u64)(myrand() & 0xffff) << 48));
+               m_mgparams->seed = m_seed;
        }
 
        /*
@@ -1951,7 +2396,7 @@ ServerMap::ServerMap(std::string savedir):
                        // If directory is empty, it is safe to save into it.
                        if(fs::GetDirListing(m_savedir).size() == 0)
                        {
-                               infostream<<"Server: Empty save directory is valid."
+                               infostream<<"ServerMap: Empty save directory is valid."
                                                <<std::endl;
                                m_map_saving_enabled = true;
                        }
@@ -1961,6 +2406,10 @@ ServerMap::ServerMap(std::string savedir):
                                        // Load map metadata (seed, chunksize)
                                        loadMapMeta();
                                }
+                               catch(SettingNotFoundException &e){
+                                       infostream<<"ServerMap:  Some metadata not found."
+                                                         <<" Using default settings."<<std::endl;
+                               }
                                catch(FileNotGoodException &e){
                                        infostream<<"WARNING: Could not load map metadata"
                                                        //<<" Disabling chunk-based generator."
@@ -1968,25 +2417,10 @@ ServerMap::ServerMap(std::string savedir):
                                        //m_chunksize = 0;
                                }
 
-                               /*try{
-                                       // Load chunk metadata
-                                       loadChunkMeta();
-                               }
-                               catch(FileNotGoodException &e){
-                                       infostream<<"WARNING: Could not load chunk metadata."
-                                                       <<" Disabling chunk-based generator."
-                                                       <<std::endl;
-                                       m_chunksize = 0;
-                               }*/
-
-                               /*infostream<<"Server: Successfully loaded chunk "
-                                               "metadata and sector (0,0) from "<<savedir<<
-                                               ", assuming valid save directory."
-                                               <<std::endl;*/
-
-                               infostream<<"Server: Successfully loaded map "
-                                               <<"and chunk metadata from "<<savedir
+                               infostream<<"ServerMap: Successfully loaded map "
+                                               <<"metadata from "<<savedir
                                                <<", assuming valid save directory."
+                                               <<" seed="<<m_seed<<"."
                                                <<std::endl;
 
                                m_map_saving_enabled = true;
@@ -2001,7 +2435,7 @@ ServerMap::ServerMap(std::string savedir):
        }
        catch(std::exception &e)
        {
-               infostream<<"WARNING: Server: Failed to load map from "<<savedir
+               infostream<<"WARNING: ServerMap: Failed to load map from "<<savedir
                                <<", exception: "<<e.what()<<std::endl;
                infostream<<"Please remove the map or fix it."<<std::endl;
                infostream<<"WARNING: Map saving will be disabled."<<std::endl;
@@ -2013,29 +2447,29 @@ ServerMap::ServerMap(std::string savedir):
        emergeSector(v2s16(0,0));
 
        // Initially write whole map
-       save(false);
+       save(MOD_STATE_CLEAN);
 }
 
 ServerMap::~ServerMap()
 {
-       infostream<<__FUNCTION_NAME<<std::endl;
+       verbosestream<<__FUNCTION_NAME<<std::endl;
 
        try
        {
                if(m_map_saving_enabled)
                {
                        // Save only changed parts
-                       save(true);
-                       infostream<<"Server: saved map to "<<m_savedir<<std::endl;
+                       save(MOD_STATE_WRITE_AT_UNLOAD);
+                       infostream<<"ServerMap: Saved map to "<<m_savedir<<std::endl;
                }
                else
                {
-                       infostream<<"Server: map not saved"<<std::endl;
+                       infostream<<"ServerMap: Map not saved"<<std::endl;
                }
        }
        catch(std::exception &e)
        {
-               infostream<<"Server: Failed to save map to "<<m_savedir
+               infostream<<"ServerMap: Failed to save map to "<<m_savedir
                                <<", exception: "<<e.what()<<std::endl;
        }
 
@@ -2060,44 +2494,57 @@ ServerMap::~ServerMap()
                delete chunk;
        }
 #endif
+
+       delete m_mgparams;
 }
 
-void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
+bool ServerMap::initBlockMake(BlockMakeData *data, v3s16 blockpos)
 {
-       bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
-       if(enable_mapgen_debug_info)
-               infostream<<"initBlockMake(): ("<<blockpos.X<<","<<blockpos.Y<<","
-                               <<blockpos.Z<<")"<<std::endl;
-       
+       bool enable_mapgen_debug_info = m_emerge->mapgen_debug_info;
+       EMERGE_DBG_OUT("initBlockMake(): " PP(blockpos) " - " PP(blockpos));
+
+       s16 chunksize = m_mgparams->chunksize;
+       s16 coffset = -chunksize / 2;
+       v3s16 chunk_offset(coffset, coffset, coffset);
+       v3s16 blockpos_div = getContainerPos(blockpos - chunk_offset, chunksize);
+       v3s16 blockpos_min = blockpos_div * chunksize;
+       v3s16 blockpos_max = blockpos_div * chunksize + v3s16(1,1,1)*(chunksize-1);
+       blockpos_min += chunk_offset;
+       blockpos_max += chunk_offset;
+
+       v3s16 extra_borders(1,1,1);
+
        // Do nothing if not inside limits (+-1 because of neighbors)
-       if(blockpos_over_limit(blockpos - v3s16(1,1,1)) ||
-               blockpos_over_limit(blockpos + v3s16(1,1,1)))
-       {
-               data->no_op = true;
-               return;
-       }
-       
-       data->no_op = false;
+       if(blockpos_over_limit(blockpos_min - extra_borders) ||
+               blockpos_over_limit(blockpos_max + extra_borders))
+               return false;
+
        data->seed = m_seed;
-       data->blockpos = blockpos;
+       data->blockpos_min = blockpos_min;
+       data->blockpos_max = blockpos_max;
+       data->blockpos_requested = blockpos;
+       data->nodedef = m_gamedef->ndef();
 
        /*
                Create the whole area of this and the neighboring blocks
        */
        {
                //TimeTaker timer("initBlockMake() create area");
-               
-               for(s16 x=-1; x<=1; x++)
-               for(s16 z=-1; z<=1; z++)
+
+               for(s16 x=blockpos_min.X-extra_borders.X;
+                               x<=blockpos_max.X+extra_borders.X; x++)
+               for(s16 z=blockpos_min.Z-extra_borders.Z;
+                               z<=blockpos_max.Z+extra_borders.Z; z++)
                {
-                       v2s16 sectorpos(blockpos.X+x, blockpos.Z+z);
+                       v2s16 sectorpos(x, z);
                        // Sector metadata is loaded from disk if not already loaded.
                        ServerMapSector *sector = createSector(sectorpos);
                        assert(sector);
 
-                       for(s16 y=-1; y<=1; y++)
+                       for(s16 y=blockpos_min.Y-extra_borders.Y;
+                                       y<=blockpos_max.Y+extra_borders.Y; y++)
                        {
-                               v3s16 p(blockpos.X+x, blockpos.Y+y, blockpos.Z+z);
+                               v3s16 p(x,y,z);
                                //MapBlock *block = createBlock(p);
                                // 1) get from memory, 2) load from disk
                                MapBlock *block = emergeBlock(p, false);
@@ -2111,7 +2558,7 @@ void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
 
                                                Refer to the map generator heuristics.
                                        */
-                                       bool ug = mapgen::block_is_underground(data->seed, p);
+                                       bool ug = m_emerge->isBlockUnderground(p);
                                        block->setIsUnderground(ug);
                                }
 
@@ -2122,18 +2569,18 @@ void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
                        }
                }
        }
-       
+
        /*
                Now we have a big empty area.
 
                Make a ManualMapVoxelManipulator that contains this and the
                neighboring blocks
        */
-       
+
        // The area that contains this block and it's neighbors
-       v3s16 bigarea_blocks_min = blockpos - v3s16(1,1,1);
-       v3s16 bigarea_blocks_max = blockpos + v3s16(1,1,1);
-       
+       v3s16 bigarea_blocks_min = blockpos_min - extra_borders;
+       v3s16 bigarea_blocks_max = blockpos_max + extra_borders;
+
        data->vmanip = new ManualMapVoxelManipulator(this);
        //data->vmanip->setMap(this);
 
@@ -2142,28 +2589,56 @@ void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
                //TimeTaker timer("initBlockMake() initialEmerge");
                data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max);
        }
+       
+       // Ensure none of the blocks to be generated were marked as containing CONTENT_IGNORE
+/*     for (s16 z = blockpos_min.Z; z <= blockpos_max.Z; z++) {
+               for (s16 y = blockpos_min.Y; y <= blockpos_max.Y; y++) {
+                       for (s16 x = blockpos_min.X; x <= blockpos_max.X; x++) {
+                               core::map<v3s16, u8>::Node *n;
+                               n = data->vmanip->m_loaded_blocks.find(v3s16(x, y, z));
+                               if (n == NULL)
+                                       continue;
+                               u8 flags = n->getValue();
+                               flags &= ~VMANIP_BLOCK_CONTAINS_CIGNORE;
+                               n->setValue(flags);
+                       }
+               }
+       }*/
 
        // Data is ready now.
+       return true;
 }
 
-MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
-               core::map<v3s16, MapBlock*> &changed_blocks)
+MapBlock* ServerMap::finishBlockMake(BlockMakeData *data,
+               std::map<v3s16, MapBlock*> &changed_blocks)
 {
-       v3s16 blockpos = data->blockpos;
-       /*infostream<<"finishBlockMake(): ("<<blockpos.X<<","<<blockpos.Y<<","
-                       <<blockpos.Z<<")"<<std::endl;*/
+       v3s16 blockpos_min = data->blockpos_min;
+       v3s16 blockpos_max = data->blockpos_max;
+       v3s16 blockpos_requested = data->blockpos_requested;
+       /*infostream<<"finishBlockMake(): ("<<blockpos_requested.X<<","
+                       <<blockpos_requested.Y<<","
+                       <<blockpos_requested.Z<<")"<<std::endl;*/
 
-       if(data->no_op)
-       {
-               //infostream<<"finishBlockMake(): no-op"<<std::endl;
-               return NULL;
-       }
+       v3s16 extra_borders(1,1,1);
 
-       bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
+       bool enable_mapgen_debug_info = m_emerge->mapgen_debug_info;
 
        /*infostream<<"Resulting vmanip:"<<std::endl;
        data->vmanip.print(infostream);*/
-       
+
+       // Make sure affected blocks are loaded
+       for(s16 x=blockpos_min.X-extra_borders.X;
+                       x<=blockpos_max.X+extra_borders.X; x++)
+       for(s16 z=blockpos_min.Z-extra_borders.Z;
+                       z<=blockpos_max.Z+extra_borders.Z; z++)
+       for(s16 y=blockpos_min.Y-extra_borders.Y;
+                       y<=blockpos_max.Y+extra_borders.Y; y++)
+       {
+               v3s16 p(x, y, z);
+               // Load from disk if not already in memory
+               emergeBlock(p, false);
+       }
+
        /*
                Blit generated stuff to map
                NOTE: blitBackAll adds nearly everything to changed_blocks
@@ -2174,9 +2649,7 @@ MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
                data->vmanip->blitBackAll(&changed_blocks);
        }
 
-       if(enable_mapgen_debug_info)
-               infostream<<"finishBlockMake: changed_blocks.size()="
-                               <<changed_blocks.size()<<std::endl;
+       EMERGE_DBG_OUT("finishBlockMake: changed_blocks.size()=" << changed_blocks.size());
 
        /*
                Copy transforming liquid information
@@ -2186,149 +2659,114 @@ MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
                v3s16 p = data->transforming_liquid.pop_front();
                m_transforming_liquid.push_back(p);
        }
-       
-       /*
-               Get central block
-       */
-       MapBlock *block = getBlockNoCreateNoEx(data->blockpos);
-       assert(block);
 
        /*
-               Set is_underground flag for lighting with sunlight.
-
-               Refer to map generator heuristics.
-
-               NOTE: This is done in initChunkMake
-       */
-       //block->setIsUnderground(mapgen::block_is_underground(data->seed, blockpos));
-
-
-       /*
-               Add sunlight to central block.
-               This makes in-dark-spawning monsters to not flood the whole thing.
-               Do not spread the light, though.
-       */
-       /*core::map<v3s16, bool> light_sources;
-       bool black_air_left = false;
-       block->propagateSunlight(light_sources, true, &black_air_left);*/
-
-       /*
-               NOTE: Lighting and object adding shouldn't really be here, but
-               lighting is a bit tricky to move properly to makeBlock.
-               TODO: Do this the right way anyway, that is, move it to makeBlock.
-                     - There needs to be some way for makeBlock to report back if
-                           the lighting update is going further down because of the
-                               new block blocking light
+               Do stuff in central blocks
        */
 
        /*
                Update lighting
-               NOTE: This takes ~60ms, TODO: Investigate why
        */
        {
+#if 0
                TimeTaker t("finishBlockMake lighting update");
 
                core::map<v3s16, MapBlock*> lighting_update_blocks;
-#if 1
-               // Center block
-               lighting_update_blocks.insert(block->getPos(), block);
-
-               /*{
-                       s16 x = 0;
-                       s16 z = 0;
-                       v3s16 p = block->getPos()+v3s16(x,1,z);
-                       lighting_update_blocks[p] = getBlockNoCreateNoEx(p);
-               }*/
-#endif
-#if 0
-               // All modified blocks
-               // NOTE: Should this be done? If this is not done, then the lighting
-               // of the others will be updated in a different place, one by one, i
-               // think... or they might not? Well, at least they are left marked as
-               // "lighting expired"; it seems that is not handled at all anywhere,
-               // so enabling this will slow it down A LOT because otherwise it
-               // would not do this at all. This causes the black trees.
-               for(core::map<v3s16, MapBlock*>::Iterator
-                               i = changed_blocks.getIterator();
-                               i.atEnd() == false; i++)
+
+               // Center blocks
+               for(s16 x=blockpos_min.X-extra_borders.X;
+                               x<=blockpos_max.X+extra_borders.X; x++)
+               for(s16 z=blockpos_min.Z-extra_borders.Z;
+                               z<=blockpos_max.Z+extra_borders.Z; z++)
+               for(s16 y=blockpos_min.Y-extra_borders.Y;
+                               y<=blockpos_max.Y+extra_borders.Y; y++)
                {
-                       lighting_update_blocks.insert(i.getNode()->getKey(),
-                                       i.getNode()->getValue());
+                       v3s16 p(x, y, z);
+                       MapBlock *block = getBlockNoCreateNoEx(p);
+                       assert(block);
+                       lighting_update_blocks.insert(block->getPos(), block);
                }
-               /*// Also force-add all the upmost blocks for proper sunlight
-               for(s16 x=-1; x<=1; x++)
-               for(s16 z=-1; z<=1; z++)
-               {
-                       v3s16 p = block->getPos()+v3s16(x,1,z);
-                       lighting_update_blocks[p] = getBlockNoCreateNoEx(p);
-               }*/
-#endif
+
                updateLighting(lighting_update_blocks, changed_blocks);
-               
+#endif
+
                /*
                        Set lighting to non-expired state in all of them.
                        This is cheating, but it is not fast enough if all of them
                        would actually be updated.
                */
-               for(s16 x=-1; x<=1; x++)
-               for(s16 y=-1; y<=1; y++)
-               for(s16 z=-1; z<=1; z++)
+               for(s16 x=blockpos_min.X-extra_borders.X;
+                               x<=blockpos_max.X+extra_borders.X; x++)
+               for(s16 z=blockpos_min.Z-extra_borders.Z;
+                               z<=blockpos_max.Z+extra_borders.Z; z++)
+               for(s16 y=blockpos_min.Y-extra_borders.Y;
+                               y<=blockpos_max.Y+extra_borders.Y; y++)
                {
-                       v3s16 p = block->getPos()+v3s16(x,y,z);
+                       v3s16 p(x, y, z);
                        getBlockNoCreateNoEx(p)->setLightingExpired(false);
                }
 
+#if 0
                if(enable_mapgen_debug_info == false)
                        t.stop(true); // Hide output
+#endif
        }
 
-       /*
-               Add random objects to block
-       */
-       mapgen::add_random_objects(block);
-
        /*
                Go through changed blocks
        */
-       for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
-                       i.atEnd() == false; i++)
+       for(std::map<v3s16, MapBlock*>::iterator i = changed_blocks.begin();
+                       i != changed_blocks.end(); ++i)
        {
-               MapBlock *block = i.getNode()->getValue();
+               MapBlock *block = i->second;
                assert(block);
                /*
                        Update day/night difference cache of the MapBlocks
                */
-               block->updateDayNightDiff();
+               block->expireDayNightDiff();
                /*
                        Set block as modified
                */
-               block->raiseModified(MOD_STATE_WRITE_NEEDED);
+               block->raiseModified(MOD_STATE_WRITE_NEEDED,
+                               "finishBlockMake expireDayNightDiff");
        }
 
        /*
-               Set central block as generated
+               Set central blocks as generated
        */
-       block->setGenerated(true);
-       
+       for(s16 x=blockpos_min.X; x<=blockpos_max.X; x++)
+       for(s16 z=blockpos_min.Z; z<=blockpos_max.Z; z++)
+       for(s16 y=blockpos_min.Y; y<=blockpos_max.Y; y++)
+       {
+               v3s16 p(x, y, z);
+               MapBlock *block = getBlockNoCreateNoEx(p);
+               assert(block);
+               block->setGenerated(true);
+       }
+
        /*
                Save changed parts of map
                NOTE: Will be saved later.
        */
-       //save(true);
+       //save(MOD_STATE_WRITE_AT_UNLOAD);
 
-       /*infostream<<"finishBlockMake() done for ("<<blockpos.X<<","<<blockpos.Y<<","
-                       <<blockpos.Z<<")"<<std::endl;*/
+       /*infostream<<"finishBlockMake() done for ("<<blockpos_requested.X
+                       <<","<<blockpos_requested.Y<<","
+                       <<blockpos_requested.Z<<")"<<std::endl;*/
 #if 0
        if(enable_mapgen_debug_info)
        {
                /*
                        Analyze resulting blocks
                */
-               for(s16 x=-1; x<=1; x++)
-               for(s16 y=-1; y<=1; y++)
-               for(s16 z=-1; z<=1; z++)
+               /*for(s16 x=blockpos_min.X-1; x<=blockpos_max.X+1; x++)
+               for(s16 z=blockpos_min.Z-1; z<=blockpos_max.Z+1; z++)
+               for(s16 y=blockpos_min.Y-1; y<=blockpos_max.Y+1; y++)*/
+               for(s16 x=blockpos_min.X-0; x<=blockpos_max.X+0; x++)
+               for(s16 z=blockpos_min.Z-0; z<=blockpos_max.Z+0; z++)
+               for(s16 y=blockpos_min.Y-0; y<=blockpos_max.Y+0; y++)
                {
-                       v3s16 p = block->getPos()+v3s16(x,y,z);
+                       v3s16 p = v3s16(x,y,z);
                        MapBlock *block = getBlockNoCreateNoEx(p);
                        char spos[20];
                        snprintf(spos, 20, "(%2d,%2d,%2d)", x, y, z);
@@ -2338,6 +2776,9 @@ MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
        }
 #endif
 
+       MapBlock *block = getBlockNoCreateNoEx(blockpos_requested);
+       assert(block);
+
        return block;
 }
 
@@ -2346,14 +2787,14 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
        DSTACKF("%s: p2d=(%d,%d)",
                        __FUNCTION_NAME,
                        p2d.X, p2d.Y);
-       
+
        /*
                Check if it exists already in memory
        */
        ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
        if(sector != NULL)
                return sector;
-       
+
        /*
                Try to load it from disk (with blocks)
        */
@@ -2386,43 +2827,44 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
        /*
                Generate blank sector
        */
-       
-       sector = new ServerMapSector(this, p2d);
-       
+
+       sector = new ServerMapSector(this, p2d, m_gamedef);
+
        // Sector position on map in nodes
-       v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;
+       //v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;
 
        /*
                Insert to container
        */
-       m_sectors.insert(p2d, sector);
-       
+       m_sectors[p2d] = sector;
+
        return sector;
 }
 
+#if 0
 /*
        This is a quick-hand function for calling makeBlock().
 */
 MapBlock * ServerMap::generateBlock(
                v3s16 p,
-               core::map<v3s16, MapBlock*> &modified_blocks
+               std::map<v3s16, MapBlock*> &modified_blocks
 )
 {
        DSTACKF("%s: p=(%d,%d,%d)", __FUNCTION_NAME, p.X, p.Y, p.Z);
-       
+
        /*infostream<<"generateBlock(): "
                        <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
                        <<std::endl;*/
-       
+
        bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
 
        TimeTaker timer("generateBlock");
-       
+
        //MapBlock *block = original_dummy;
-                       
+
        v2s16 p2d(p.X, p.Z);
        v2s16 p2d_nodes = p2d * MAP_BLOCKSIZE;
-       
+
        /*
                Do not generate over-limit
        */
@@ -2435,7 +2877,7 @@ MapBlock * ServerMap::generateBlock(
        /*
                Create block make data
        */
-       mapgen::BlockMakeData data;
+       BlockMakeData data;
        initBlockMake(&data, p);
 
        /*
@@ -2443,7 +2885,8 @@ MapBlock * ServerMap::generateBlock(
        */
        {
                TimeTaker t("mapgen::make_block()");
-               mapgen::make_block(&data);
+               mapgen->makeChunk(&data);
+               //mapgen::make_block(&data);
 
                if(enable_mapgen_debug_info == false)
                        t.stop(true); // Hide output
@@ -2500,10 +2943,7 @@ MapBlock * ServerMap::generateBlock(
                        for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
                        {
                                MapNode n;
-                               if(y0%2==0)
-                                       n.setContent(CONTENT_AIR);
-                               else
-                                       n.setContent(CONTENT_STONE);
+                               n.setContent(CONTENT_AIR);
                                block->setNode(v3s16(x0,y0,z0), n);
                        }
                }
@@ -2515,12 +2955,13 @@ MapBlock * ServerMap::generateBlock(
 
        return block;
 }
+#endif
 
 MapBlock * ServerMap::createBlock(v3s16 p)
 {
        DSTACKF("%s: p=(%d,%d,%d)",
                        __FUNCTION_NAME, p.X, p.Y, p.Z);
-       
+
        /*
                Do not create over-limit
        */
@@ -2531,7 +2972,7 @@ MapBlock * ServerMap::createBlock(v3s16 p)
        || p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
        || p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
                throw InvalidPositionException("createBlock(): pos. over limit");
-       
+
        v2s16 p2d(p.X, p.Z);
        s16 block_y = p.Y;
        /*
@@ -2576,15 +3017,16 @@ MapBlock * ServerMap::createBlock(v3s16 p)
        }
        // Create blank
        block = sector->createBlankBlock(block_y);
+
        return block;
 }
 
-MapBlock * ServerMap::emergeBlock(v3s16 p, bool allow_generate)
+MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
 {
-       DSTACKF("%s: p=(%d,%d,%d), allow_generate=%d",
+       DSTACKF("%s: p=(%d,%d,%d), create_blank=%d",
                        __FUNCTION_NAME,
-                       p.X, p.Y, p.Z, allow_generate);
-       
+                       p.X, p.Y, p.Z, create_blank);
+
        {
                MapBlock *block = getBlockNoCreateNoEx(p);
                if(block && block->isDummy() == false)
@@ -2597,9 +3039,15 @@ MapBlock * ServerMap::emergeBlock(v3s16 p, bool allow_generate)
                        return block;
        }
 
-       if(allow_generate)
+       if (create_blank) {
+               ServerMapSector *sector = createSector(v2s16(p.X, p.Z));
+               MapBlock *block = sector->createBlankBlock(p.Y);
+
+               return block;
+       }
+       /*if(allow_generate)
        {
-               core::map<v3s16, MapBlock*> modified_blocks;
+               std::map<v3s16, MapBlock*> modified_blocks;
                MapBlock *block = generateBlock(p, modified_blocks);
                if(block)
                {
@@ -2608,19 +3056,19 @@ MapBlock * ServerMap::emergeBlock(v3s16 p, bool allow_generate)
                        event.p = p;
 
                        // Copy modified_blocks to event
-                       for(core::map<v3s16, MapBlock*>::Iterator
-                                       i = modified_blocks.getIterator();
-                                       i.atEnd()==false; i++)
+                       for(std::map<v3s16, MapBlock*>::iterator
+                                       i = modified_blocks.begin();
+                                       i != modified_blocks.end(); ++i)
                        {
-                               event.modified_blocks.insert(i.getNode()->getKey(), false);
+                               event.modified_blocks.insert(i->first);
                        }
 
                        // Queue event
                        dispatchEvent(&event);
-                                                               
+
                        return block;
                }
-       }
+       }*/
 
        return NULL;
 }
@@ -2661,8 +3109,8 @@ s16 ServerMap::findGroundLevel(v2s16 p2d)
        /*
                Determine from map generator noise functions
        */
-       
-       s16 level = mapgen::find_ground_level_from_noise(m_seed, p2d, 1);
+
+       s16 level = m_emerge->getGroundLevelAtPoint(p2d);
        return level;
 
        //double level = base_rock_level_2d(m_seed, p2d) + AVERAGE_MUD_AMOUNT;
@@ -2681,55 +3129,55 @@ void ServerMap::createDatabase() {
        if(e == SQLITE_ABORT)
                throw FileNotGoodException("Could not create database structure");
        else
-               infostream<<"Server: Database structure was created";
+               infostream<<"ServerMap: Database structure was created";
 }
 
 void ServerMap::verifyDatabase() {
        if(m_database)
                return;
-       
+
        {
                std::string dbp = m_savedir + DIR_DELIM + "map.sqlite";
                bool needs_create = false;
                int d;
-               
+
                /*
                        Open the database connection
                */
-       
+
                createDirs(m_savedir);
-       
+
                if(!fs::PathExists(dbp))
                        needs_create = true;
-       
+
                d = sqlite3_open_v2(dbp.c_str(), &m_database, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL);
                if(d != SQLITE_OK) {
                        infostream<<"WARNING: Database failed to open: "<<sqlite3_errmsg(m_database)<<std::endl;
                        throw FileNotGoodException("Cannot open database file");
                }
-               
+
                if(needs_create)
                        createDatabase();
-       
+
                d = sqlite3_prepare(m_database, "SELECT `data` FROM `blocks` WHERE `pos`=? LIMIT 1", -1, &m_database_read, NULL);
                if(d != SQLITE_OK) {
                        infostream<<"WARNING: Database read statment failed to prepare: "<<sqlite3_errmsg(m_database)<<std::endl;
                        throw FileNotGoodException("Cannot prepare read statement");
                }
-               
+
                d = sqlite3_prepare(m_database, "REPLACE INTO `blocks` VALUES(?, ?)", -1, &m_database_write, NULL);
                if(d != SQLITE_OK) {
                        infostream<<"WARNING: Database write statment failed to prepare: "<<sqlite3_errmsg(m_database)<<std::endl;
                        throw FileNotGoodException("Cannot prepare write statement");
                }
-               
+
                d = sqlite3_prepare(m_database, "SELECT `pos` FROM `blocks`", -1, &m_database_list, NULL);
                if(d != SQLITE_OK) {
                        infostream<<"WARNING: Database list statment failed to prepare: "<<sqlite3_errmsg(m_database)<<std::endl;
                        throw FileNotGoodException("Cannot prepare read statement");
                }
-               
-               infostream<<"Server: Database opened"<<std::endl;
+
+               infostream<<"ServerMap: Database opened"<<std::endl;
        }
 }
 
@@ -2825,7 +3273,7 @@ std::string ServerMap::getBlockFilename(v3s16 p)
        return cc;
 }
 
-void ServerMap::save(bool only_changed)
+void ServerMap::save(ModifiedState save_level)
 {
        DSTACK(__FUNCTION_NAME);
        if(m_map_saving_enabled == false)
@@ -2833,46 +3281,57 @@ void ServerMap::save(bool only_changed)
                infostream<<"WARNING: Not saving map, saving disabled."<<std::endl;
                return;
        }
-       
-       if(only_changed == false)
+
+       if(save_level == MOD_STATE_CLEAN)
                infostream<<"ServerMap: Saving whole map, this can take time."
                                <<std::endl;
-       
-       if(only_changed == false || m_map_metadata_changed)
+
+       if(m_map_metadata_changed || save_level == MOD_STATE_CLEAN)
        {
                saveMapMeta();
        }
 
+       // Profile modified reasons
+       Profiler modprofiler;
+
        u32 sector_meta_count = 0;
        u32 block_count = 0;
        u32 block_count_all = 0; // Number of blocks in memory
-       
-       beginSave();
-       core::map<v2s16, MapSector*>::Iterator i = m_sectors.getIterator();
-       for(; i.atEnd() == false; i++)
+
+       // Don't do anything with sqlite unless something is really saved
+       bool save_started = false;
+
+       for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
+               i != m_sectors.end(); ++i)
        {
-               ServerMapSector *sector = (ServerMapSector*)i.getNode()->getValue();
+               ServerMapSector *sector = (ServerMapSector*)i->second;
                assert(sector->getId() == MAPSECTOR_SERVER);
-       
-               if(sector->differs_from_disk || only_changed == false)
+
+               if(sector->differs_from_disk || save_level == MOD_STATE_CLEAN)
                {
                        saveSectorMeta(sector);
                        sector_meta_count++;
                }
-               core::list<MapBlock*> blocks;
+               std::list<MapBlock*> blocks;
                sector->getBlocks(blocks);
-               core::list<MapBlock*>::Iterator j;
-               
-               //sqlite3_exec(m_database, "BEGIN;", NULL, NULL, NULL);
-               for(j=blocks.begin(); j!=blocks.end(); j++)
+
+               for(std::list<MapBlock*>::iterator j = blocks.begin();
+                       j != blocks.end(); ++j)
                {
                        MapBlock *block = *j;
-                       
+
                        block_count_all++;
 
-                       if(block->getModified() >= MOD_STATE_WRITE_NEEDED 
-                                       || only_changed == false)
+                       if(block->getModified() >= (u32)save_level)
                        {
+                               // Lazy beginSave()
+                               if(!save_started){
+                                       beginSave();
+                                       save_started = true;
+                               }
+
+                               modprofiler.add(block->getModifiedReason(), 1);
+
                                saveBlock(block);
                                block_count++;
 
@@ -2882,15 +3341,15 @@ void ServerMap::save(bool only_changed)
                                                <<block->getPos().Z<<")"
                                                <<std::endl;*/
                        }
-               //sqlite3_exec(m_database, "COMMIT;", NULL, NULL, NULL);
                }
        }
-       endSave();
+       if(save_started)
+               endSave();
 
        /*
                Only print if something happened or saved whole map
        */
-       if(only_changed == false || sector_meta_count != 0
+       if(save_level == MOD_STATE_CLEAN || sector_meta_count != 0
                        || block_count != 0)
        {
                infostream<<"ServerMap: Written: "
@@ -2898,6 +3357,9 @@ void ServerMap::save(bool only_changed)
                                <<block_count<<" block files"
                                <<", "<<block_count_all<<" blocks in memory."
                                <<std::endl;
+               PrintInfo(infostream); // ServerMap/ClientMap:
+               infostream<<"Blocks modified by: "<<std::endl;
+               modprofiler.print(infostream);
        }
 }
 
@@ -2927,16 +3389,16 @@ v3s16 ServerMap::getIntegerAsBlock(sqlite3_int64 i)
        return v3s16(x,y,z);
 }
 
-void ServerMap::listAllLoadableBlocks(core::list<v3s16> &dst)
+void ServerMap::listAllLoadableBlocks(std::list<v3s16> &dst)
 {
        if(loadFromFolders()){
                errorstream<<"Map::listAllLoadableBlocks(): Result will be missing "
                                <<"all blocks that are stored in flat files"<<std::endl;
        }
-       
+
        {
                verifyDatabase();
-               
+
                while(sqlite3_step(m_database_list) == SQLITE_ROW)
                {
                        sqlite3_int64 block_i = sqlite3_column_int64(m_database_list, 0);
@@ -2950,13 +3412,13 @@ void ServerMap::listAllLoadableBlocks(core::list<v3s16> &dst)
 void ServerMap::saveMapMeta()
 {
        DSTACK(__FUNCTION_NAME);
-       
-       infostream<<"ServerMap::saveMapMeta(): "
+
+       /*infostream<<"ServerMap::saveMapMeta(): "
                        <<"seed="<<m_seed
-                       <<std::endl;
+                       <<std::endl;*/
 
        createDirs(m_savedir);
-       
+
        std::string fullpath = m_savedir + DIR_DELIM + "map_meta.txt";
        std::ofstream os(fullpath.c_str(), std::ios_base::binary);
        if(os.good() == false)
@@ -2965,23 +3427,23 @@ void ServerMap::saveMapMeta()
                                <<"could not open"<<fullpath<<std::endl;
                throw FileNotGoodException("Cannot open chunk metadata");
        }
-       
+
        Settings params;
-       params.setU64("seed", m_seed);
 
+       m_emerge->setParamsToSettings(&params);
        params.writeLines(os);
 
        os<<"[end_of_params]\n";
-       
+
        m_map_metadata_changed = false;
 }
 
 void ServerMap::loadMapMeta()
 {
        DSTACK(__FUNCTION_NAME);
-       
-       infostream<<"ServerMap::loadMapMeta(): Loading map metadata"
-                       <<std::endl;
+
+       /*infostream<<"ServerMap::loadMapMeta(): Loading map metadata"
+                       <<std::endl;*/
 
        std::string fullpath = m_savedir + DIR_DELIM + "map_meta.txt";
        std::ifstream is(fullpath.c_str(), std::ios_base::binary);
@@ -3006,10 +3468,29 @@ void ServerMap::loadMapMeta()
                        break;
                params.parseConfigLine(line);
        }
+       
+       MapgenParams *mgparams;
+       try {
+               mgparams = m_emerge->getParamsFromSettings(&params);
+       } catch (SettingNotFoundException &e) {
+               infostream << "Couldn't get a setting from map_meta.txt: "
+                                  << e.what() << std::endl;
+               mgparams = NULL;
+       }
+       
+       if (mgparams) {
+               if (m_mgparams)
+                       delete m_mgparams;
+               m_mgparams = mgparams;
+               m_seed = mgparams->seed;
+       } else {
+               if (params.exists("seed")) {
+                       m_seed = params.getU64("seed");
+                       m_mgparams->seed = m_seed;
+               }
+       }
 
-       m_seed = params.getU64("seed");
-
-       infostream<<"ServerMap::loadMapMeta(): "<<"seed="<<m_seed<<std::endl;
+       verbosestream<<"ServerMap::loadMapMeta(): "<<"seed="<<m_seed<<std::endl;
 }
 
 void ServerMap::saveSectorMeta(ServerMapSector *sector)
@@ -3021,14 +3502,14 @@ void ServerMap::saveSectorMeta(ServerMapSector *sector)
        v2s16 pos = sector->getPos();
        std::string dir = getSectorDir(pos);
        createDirs(dir);
-       
+
        std::string fullpath = dir + DIR_DELIM + "meta";
        std::ofstream o(fullpath.c_str(), std::ios_base::binary);
        if(o.good() == false)
                throw FileNotGoodException("Cannot open sector metafile");
 
        sector->serialize(o, version);
-       
+
        sector->differs_from_disk = false;
 }
 
@@ -3052,8 +3533,8 @@ MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load
                                        <<fullpath<<" doesn't exist but directory does."
                                        <<" Continuing with a sector with no metadata."
                                        <<std::endl;*/
-                       sector = new ServerMapSector(this, p2d);
-                       m_sectors.insert(p2d, sector);
+                       sector = new ServerMapSector(this, p2d, m_gamedef);
+                       m_sectors[p2d] = sector;
                }
                else
                {
@@ -3063,11 +3544,11 @@ MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load
        else
        {
                sector = ServerMapSector::deSerialize
-                               (is, this, p2d, m_sectors);
+                               (is, this, p2d, m_sectors, m_gamedef);
                if(save_after_load)
                        saveSectorMeta(sector);
        }
-       
+
        sector->differs_from_disk = false;
 
        return sector;
@@ -3112,7 +3593,7 @@ bool ServerMap::loadSectorMeta(v2s16 p2d)
        {
                return false;
        }
-       
+
        return true;
 }
 
@@ -3156,7 +3637,7 @@ bool ServerMap::loadSectorFull(v2s16 p2d)
        {
                return false;
        }
-       
+
        /*
                Load blocks
        */
@@ -3218,8 +3699,8 @@ void ServerMap::saveBlock(MapBlock *block)
        u8 version = SER_FMT_VER_HIGHEST;
        // Get destination
        v3s16 p3d = block->getPos();
-       
-       
+
+
 #if 0
        v2s16 p2d(p3d.X, p3d.Z);
        std::string sectordir = getSectorDir(p2d);
@@ -3235,37 +3716,42 @@ void ServerMap::saveBlock(MapBlock *block)
                [0] u8 serialization version
                [1] data
        */
-       
+
        verifyDatabase();
-       
+
        std::ostringstream o(std::ios_base::binary);
-       
+
        o.write((char*)&version, 1);
-       
+
        // Write basic data
-       block->serialize(o, version);
-       
-       // Write extra data stored on disk
-       block->serializeDiskExtra(o, version);
-       
+       block->serialize(o, version, true);
+
        // Write block to database
-       
+
        std::string tmp = o.str();
        const char *bytes = tmp.c_str();
-       
-       if(sqlite3_bind_int64(m_database_write, 1, getBlockAsInteger(p3d)) != SQLITE_OK)
+
+       bool success = true;
+       if(sqlite3_bind_int64(m_database_write, 1, getBlockAsInteger(p3d)) != SQLITE_OK) {
                infostream<<"WARNING: Block position failed to bind: "<<sqlite3_errmsg(m_database)<<std::endl;
-       if(sqlite3_bind_blob(m_database_write, 2, (void *)bytes, o.tellp(), NULL) != SQLITE_OK) // TODO this mught not be the right length
+               success = false;
+       }
+       if(sqlite3_bind_blob(m_database_write, 2, (void *)bytes, o.tellp(), NULL) != SQLITE_OK) { // TODO this mught not be the right length
                infostream<<"WARNING: Block data failed to bind: "<<sqlite3_errmsg(m_database)<<std::endl;
+               success = false;
+       }
        int written = sqlite3_step(m_database_write);
-       if(written != SQLITE_DONE)
-               infostream<<"WARNING: Block failed to save ("<<p3d.X<<", "<<p3d.Y<<", "<<p3d.Z<<") "
-               <<sqlite3_errmsg(m_database)<<std::endl;
+       if(written != SQLITE_DONE) {
+               errorstream<<"WARNING: Block failed to save ("<<p3d.X<<", "<<p3d.Y<<", "<<p3d.Z<<") "
+                               <<sqlite3_errmsg(m_database)<<std::endl;
+               success = false;
+       }
        // Make ready for later reuse
        sqlite3_reset(m_database_write);
-       
+
        // We just wrote it to the disk so clear modified flag
-       block->resetModified();
+       if (success)
+               block->resetModified();
 }
 
 void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSector *sector, bool save_after_load)
@@ -3278,12 +3764,12 @@ void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSecto
                std::ifstream is(fullpath.c_str(), std::ios_base::binary);
                if(is.good() == false)
                        throw FileNotGoodException("Cannot open block file");
-               
+
                v3s16 p3d = getBlockPos(sectordir, blockfile);
                v2s16 p2d(p3d.X, p3d.Z);
-               
+
                assert(sector->getPos() == p2d);
-               
+
                u8 version = SER_FMT_VER_INVALID;
                is.read((char*)&version, 1);
 
@@ -3306,17 +3792,14 @@ void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSecto
                        block = sector->createBlankBlockNoInsert(p3d.Y);
                        created_new = true;
                }
-               
+
                // Read basic data
-               block->deSerialize(is, version);
+               block->deSerialize(is, version, true);
 
-               // Read extra data stored on disk
-               block->deSerializeDiskExtra(is, version);
-               
                // If it's a new block, insert it to the map
                if(created_new)
                        sector->insertBlock(block);
-               
+
                /*
                        Save blocks loaded in old format in new format
                */
@@ -3324,11 +3807,11 @@ void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSecto
                if(version < SER_FMT_VER_HIGHEST || save_after_load)
                {
                        saveBlock(block);
-                       
+
                        // Should be in database now, so delete the old file
                        fs::RecursiveDelete(fullpath);
                }
-               
+
                // We just loaded it from the disk, so it's up-to-date.
                block->resetModified();
 
@@ -3353,7 +3836,7 @@ void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool
 
        try {
                std::istringstream is(*blob, std::ios_base::binary);
-               
+
                u8 version = SER_FMT_VER_INVALID;
                is.read((char*)&version, 1);
 
@@ -3376,876 +3859,146 @@ void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool
                        block = sector->createBlankBlockNoInsert(p3d.Y);
                        created_new = true;
                }
-               
+
                // Read basic data
-               block->deSerialize(is, version);
+               block->deSerialize(is, version, true);
 
-               // Read extra data stored on disk
-               block->deSerializeDiskExtra(is, version);
-               
                // If it's a new block, insert it to the map
                if(created_new)
                        sector->insertBlock(block);
-               
-               /*
-                       Save blocks loaded in old format in new format
-               */
-
-               if(version < SER_FMT_VER_HIGHEST || save_after_load)
-               {
-                       saveBlock(block);
-               }
-               
-               // We just loaded it from, so it's up-to-date.
-               block->resetModified();
-
-       }
-       catch(SerializationError &e)
-       {
-               infostream<<"WARNING: Invalid block data in database "
-                               <<" (SerializationError). "
-                               <<"what()="<<e.what()
-                               <<std::endl;
-                               //" Ignoring. A new one will be generated.
-               assert(0);
-
-               // TODO: Copy to a backup database.
-       }
-}
-
-MapBlock* ServerMap::loadBlock(v3s16 blockpos)
-{
-       DSTACK(__FUNCTION_NAME);
-
-       v2s16 p2d(blockpos.X, blockpos.Z);
-
-       if(!loadFromFolders()) {
-               verifyDatabase();
-               
-               if(sqlite3_bind_int64(m_database_read, 1, getBlockAsInteger(blockpos)) != SQLITE_OK)
-                       infostream<<"WARNING: Could not bind block position for load: "
-                               <<sqlite3_errmsg(m_database)<<std::endl;
-               if(sqlite3_step(m_database_read) == SQLITE_ROW) {
-                       /*
-                               Make sure sector is loaded
-                       */
-                       MapSector *sector = createSector(p2d);
-                       
-                       /*
-                               Load block
-                       */
-                       const char * data = (const char *)sqlite3_column_blob(m_database_read, 0);
-                       size_t len = sqlite3_column_bytes(m_database_read, 0);
-                       
-                       std::string datastr(data, len);
-                       
-                       loadBlock(&datastr, blockpos, sector, false);
-
-                       sqlite3_step(m_database_read);
-                       // We should never get more than 1 row, so ok to reset
-                       sqlite3_reset(m_database_read);
-
-                       return getBlockNoCreateNoEx(blockpos);
-               }
-               sqlite3_reset(m_database_read);
-               
-               // Not found in database, try the files
-       }
-
-       // The directory layout we're going to load from.
-       //  1 - original sectors/xxxxzzzz/
-       //  2 - new sectors2/xxx/zzz/
-       //  If we load from anything but the latest structure, we will
-       //  immediately save to the new one, and remove the old.
-       int loadlayout = 1;
-       std::string sectordir1 = getSectorDir(p2d, 1);
-       std::string sectordir;
-       if(fs::PathExists(sectordir1))
-       {
-               sectordir = sectordir1;
-       }
-       else
-       {
-               loadlayout = 2;
-               sectordir = getSectorDir(p2d, 2);
-       }
-       
-       /*
-               Make sure sector is loaded
-       */
-       MapSector *sector = getSectorNoGenerateNoEx(p2d);
-       if(sector == NULL)
-       {
-               try{
-                       sector = loadSectorMeta(sectordir, loadlayout != 2);
-               }
-               catch(InvalidFilenameException &e)
-               {
-                       return false;
-               }
-               catch(FileNotGoodException &e)
-               {
-                       return false;
-               }
-               catch(std::exception &e)
-               {
-                       return false;
-               }
-       }
-       
-       /*
-               Make sure file exists
-       */
-
-       std::string blockfilename = getBlockFilename(blockpos);
-       if(fs::PathExists(sectordir+DIR_DELIM+blockfilename) == false)
-               return NULL;
-
-       /*
-               Load block and save it to the database
-       */
-       loadBlock(sectordir, blockfilename, sector, true);
-       return getBlockNoCreateNoEx(blockpos);
-}
 
-void ServerMap::PrintInfo(std::ostream &out)
-{
-       out<<"ServerMap: ";
-}
-
-#ifndef SERVER
-
-/*
-       ClientMap
-*/
-
-ClientMap::ClientMap(
-               Client *client,
-               MapDrawControl &control,
-               scene::ISceneNode* parent,
-               scene::ISceneManager* mgr,
-               s32 id
-):
-       Map(dout_client),
-       scene::ISceneNode(parent, mgr, id),
-       m_client(client),
-       m_control(control),
-       m_camera_position(0,0,0),
-       m_camera_direction(0,0,1),
-       m_camera_fov(PI)
-{
-       m_camera_mutex.Init();
-       assert(m_camera_mutex.IsInitialized());
-       
-       m_box = core::aabbox3d<f32>(-BS*1000000,-BS*1000000,-BS*1000000,
-                       BS*1000000,BS*1000000,BS*1000000);
-}
-
-ClientMap::~ClientMap()
-{
-       /*JMutexAutoLock lock(mesh_mutex);
-       
-       if(mesh != NULL)
-       {
-               mesh->drop();
-               mesh = NULL;
-       }*/
-}
-
-MapSector * ClientMap::emergeSector(v2s16 p2d)
-{
-       DSTACK(__FUNCTION_NAME);
-       // Check that it doesn't exist already
-       try{
-               return getSectorNoGenerate(p2d);
-       }
-       catch(InvalidPositionException &e)
-       {
-       }
-       
-       // Create a sector
-       ClientMapSector *sector = new ClientMapSector(this, p2d);
-       
-       {
-               //JMutexAutoLock lock(m_sector_mutex); // Bulk comment-out
-               m_sectors.insert(p2d, sector);
-       }
-       
-       return sector;
-}
-
-#if 0
-void ClientMap::deSerializeSector(v2s16 p2d, std::istream &is)
-{
-       DSTACK(__FUNCTION_NAME);
-       ClientMapSector *sector = NULL;
-
-       //JMutexAutoLock lock(m_sector_mutex); // Bulk comment-out
-       
-       core::map<v2s16, MapSector*>::Node *n = m_sectors.find(p2d);
-
-       if(n != NULL)
-       {
-               sector = (ClientMapSector*)n->getValue();
-               assert(sector->getId() == MAPSECTOR_CLIENT);
-       }
-       else
-       {
-               sector = new ClientMapSector(this, p2d);
-               {
-                       //JMutexAutoLock lock(m_sector_mutex); // Bulk comment-out
-                       m_sectors.insert(p2d, sector);
-               }
-       }
-
-       sector->deSerialize(is);
-}
-#endif
-
-void ClientMap::OnRegisterSceneNode()
-{
-       if(IsVisible)
-       {
-               SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
-               SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
-       }
-
-       ISceneNode::OnRegisterSceneNode();
-}
-
-static bool isOccluded(Map *map, v3s16 p0, v3s16 p1, float step, float stepfac,
-               float start_off, float end_off, u32 needed_count)
-{
-       float d0 = (float)BS * p0.getDistanceFrom(p1);
-       v3s16 u0 = p1 - p0;
-       v3f uf = v3f(u0.X, u0.Y, u0.Z) * BS;
-       uf.normalize();
-       v3f p0f = v3f(p0.X, p0.Y, p0.Z) * BS;
-       u32 count = 0;
-       for(float s=start_off; s<d0+end_off; s+=step){
-               v3f pf = p0f + uf * s;
-               v3s16 p = floatToInt(pf, BS);
-               MapNode n = map->getNodeNoEx(p);
-               bool is_transparent = false;
-               ContentFeatures &f = content_features(n);
-               if(f.solidness == 0)
-                       is_transparent = (f.visual_solidness != 2);
-               else
-                       is_transparent = (f.solidness != 2);
-               if(!is_transparent){
-                       count++;
-                       if(count >= needed_count)
-                               return true;
-               }
-               step *= stepfac;
-       }
-       return false;
-}
-
-void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
-{
-       //m_dout<<DTIME<<"Rendering map..."<<std::endl;
-       DSTACK(__FUNCTION_NAME);
-
-       bool is_transparent_pass = pass == scene::ESNRP_TRANSPARENT;
-       
-       std::string prefix;
-       if(pass == scene::ESNRP_SOLID)
-               prefix = "CM: solid: ";
-       else
-               prefix = "CM: transparent: ";
-
-       /*
-               This is called two times per frame, reset on the non-transparent one
-       */
-       if(pass == scene::ESNRP_SOLID)
-       {
-               m_last_drawn_sectors.clear();
-       }
-
-       /*
-               Get time for measuring timeout.
-               
-               Measuring time is very useful for long delays when the
-               machine is swapping a lot.
-       */
-       int time1 = time(0);
-
-       //u32 daynight_ratio = m_client->getDayNightRatio();
-
-       m_camera_mutex.Lock();
-       v3f camera_position = m_camera_position;
-       v3f camera_direction = m_camera_direction;
-       f32 camera_fov = m_camera_fov;
-       m_camera_mutex.Unlock();
-
-       /*
-               Get all blocks and draw all visible ones
-       */
-
-       v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
-       
-       v3s16 box_nodes_d = m_control.wanted_range * v3s16(1,1,1);
-
-       v3s16 p_nodes_min = cam_pos_nodes - box_nodes_d;
-       v3s16 p_nodes_max = cam_pos_nodes + box_nodes_d;
-
-       // Take a fair amount as we will be dropping more out later
-       // Umm... these additions are a bit strange but they are needed.
-       v3s16 p_blocks_min(
-                       p_nodes_min.X / MAP_BLOCKSIZE - 3,
-                       p_nodes_min.Y / MAP_BLOCKSIZE - 3,
-                       p_nodes_min.Z / MAP_BLOCKSIZE - 3);
-       v3s16 p_blocks_max(
-                       p_nodes_max.X / MAP_BLOCKSIZE + 1,
-                       p_nodes_max.Y / MAP_BLOCKSIZE + 1,
-                       p_nodes_max.Z / MAP_BLOCKSIZE + 1);
-       
-       u32 vertex_count = 0;
-       u32 meshbuffer_count = 0;
-       
-       // For limiting number of mesh updates per frame
-       u32 mesh_update_count = 0;
-       
-       // Number of blocks in rendering range
-       u32 blocks_in_range = 0;
-       // Number of blocks occlusion culled
-       u32 blocks_occlusion_culled = 0;
-       // Number of blocks in rendering range but don't have a mesh
-       u32 blocks_in_range_without_mesh = 0;
-       // Blocks that had mesh that would have been drawn according to
-       // rendering range (if max blocks limit didn't kick in)
-       u32 blocks_would_have_drawn = 0;
-       // Blocks that were drawn and had a mesh
-       u32 blocks_drawn = 0;
-       // Blocks which had a corresponding meshbuffer for this pass
-       u32 blocks_had_pass_meshbuf = 0;
-       // Blocks from which stuff was actually drawn
-       u32 blocks_without_stuff = 0;
-
-       /*
-               Collect a set of blocks for drawing
-       */
-       
-       core::map<v3s16, MapBlock*> drawset;
-
-       {
-       ScopeProfiler sp(g_profiler, prefix+"collecting blocks for drawing", SPT_AVG);
-
-       for(core::map<v2s16, MapSector*>::Iterator
-                       si = m_sectors.getIterator();
-                       si.atEnd() == false; si++)
-       {
-               MapSector *sector = si.getNode()->getValue();
-               v2s16 sp = sector->getPos();
-               
-               if(m_control.range_all == false)
-               {
-                       if(sp.X < p_blocks_min.X
-                       || sp.X > p_blocks_max.X
-                       || sp.Y < p_blocks_min.Z
-                       || sp.Y > p_blocks_max.Z)
-                               continue;
-               }
-
-               core::list< MapBlock * > sectorblocks;
-               sector->getBlocks(sectorblocks);
-               
                /*
-                       Loop through blocks in sector
+                       Save blocks loaded in old format in new format
                */
 
-               u32 sector_blocks_drawn = 0;
-               
-               core::list< MapBlock * >::Iterator i;
-               for(i=sectorblocks.begin(); i!=sectorblocks.end(); i++)
-               {
-                       MapBlock *block = *i;
-
-                       /*
-                               Compare block position to camera position, skip
-                               if not seen on display
-                       */
-                       
-                       float range = 100000 * BS;
-                       if(m_control.range_all == false)
-                               range = m_control.wanted_range * BS;
-
-                       float d = 0.0;
-                       if(isBlockInSight(block->getPos(), camera_position,
-                                       camera_direction, camera_fov,
-                                       range, &d) == false)
-                       {
-                               continue;
-                       }
-
-                       // This is ugly (spherical distance limit?)
-                       /*if(m_control.range_all == false &&
-                                       d - 0.5*BS*MAP_BLOCKSIZE > range)
-                               continue;*/
-
-                       blocks_in_range++;
-                       
-                       // This block is in range. Reset usage timer.
-                       block->resetUsageTimer();
-
-#if 1
-                       /*
-                               Update expired mesh (used for day/night change)
+               //if(version < SER_FMT_VER_HIGHEST || save_after_load)
+               // Only save if asked to; no need to update version
+               if(save_after_load)
+                       saveBlock(block);
 
-                               It doesn't work exactly like it should now with the
-                               tasked mesh update but whatever.
-                       */
+               // We just loaded it from, so it's up-to-date.
+               block->resetModified();
 
-                       bool mesh_expired = false;
-                       
-                       {
-                               JMutexAutoLock lock(block->mesh_mutex);
+       }
+       catch(SerializationError &e)
+       {
+               errorstream<<"Invalid block data in database"
+                               <<" ("<<p3d.X<<","<<p3d.Y<<","<<p3d.Z<<")"
+                               <<" (SerializationError): "<<e.what()<<std::endl;
 
-                               mesh_expired = block->getMeshExpired();
+               // TODO: Block should be marked as invalid in memory so that it is
+               // not touched but the game can run
 
-                               // Mesh has not been expired and there is no mesh:
-                               // block has no content
-                               if(block->mesh == NULL && mesh_expired == false){
-                                       blocks_in_range_without_mesh++;
-                                       continue;
-                               }
-                       }
+               if(g_settings->getBool("ignore_world_load_errors")){
+                       errorstream<<"Ignoring block load error. Duck and cover! "
+                                       <<"(ignore_world_load_errors)"<<std::endl;
+               } else {
+                       throw SerializationError("Invalid block data in database");
+                       //assert(0);
+               }
+       }
+}
 
-                       f32 faraway = BS*50;
-                       //f32 faraway = m_control.wanted_range * BS;
-                       
-                       /*
-                               This has to be done with the mesh_mutex unlocked
-                       */
-                       // Pretty random but this should work somewhat nicely
-                       if(mesh_expired && (
-                                       (mesh_update_count < 3
-                                               && (d < faraway || mesh_update_count < 2)
-                                       )
-                                       || 
-                                       (m_control.range_all && mesh_update_count < 20)
-                               )
-                       )
-                       /*if(mesh_expired && mesh_update_count < 6
-                                       && (d < faraway || mesh_update_count < 3))*/
-                       {
-                               mesh_update_count++;
+MapBlock* ServerMap::loadBlock(v3s16 blockpos)
+{
+       DSTACK(__FUNCTION_NAME);
 
-                               // Mesh has been expired: generate new mesh
-                               //block->updateMesh(daynight_ratio);
-                               m_client->addUpdateMeshTask(block->getPos());
+       v2s16 p2d(blockpos.X, blockpos.Z);
 
-                               mesh_expired = false;
-                       }
-#endif
+       if(!loadFromFolders()) {
+               verifyDatabase();
 
+               if(sqlite3_bind_int64(m_database_read, 1, getBlockAsInteger(blockpos)) != SQLITE_OK)
+                       infostream<<"WARNING: Could not bind block position for load: "
+                               <<sqlite3_errmsg(m_database)<<std::endl;
+               if(sqlite3_step(m_database_read) == SQLITE_ROW) {
                        /*
-                               Occlusion culling
+                               Make sure sector is loaded
                        */
+                       MapSector *sector = createSector(p2d);
 
-                       v3s16 cpn = v3s16(block->getPos() * MAP_BLOCKSIZE)
-                                       + v3s16(MAP_BLOCKSIZE)/2;
-                       float step = BS*1;
-                       float stepfac = 1.1;
-                       float startoff = BS*1;
-                       float endoff = -BS*MAP_BLOCKSIZE*1.42*1.42;
-                       v3s16 spn = cam_pos_nodes + v3s16(0,0,0);
-                       s16 bs2 = MAP_BLOCKSIZE/2 + 1;
-                       u32 needed_count = 1;
-                       if(
-                               isOccluded(this, spn, cpn + v3s16(0,0,0),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,bs2,bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,bs2,-bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,-bs2,bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,-bs2,-bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,bs2,bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,bs2,-bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,bs2),
-                                               step, stepfac, startoff, endoff, needed_count) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,-bs2),
-                                               step, stepfac, startoff, endoff, needed_count)
-                       )
-                       {
-                               blocks_occlusion_culled++;
-                               continue;
-                       }
-                       
                        /*
-                               Ignore if mesh doesn't exist
+                               Load block
                        */
-                       {
-                               JMutexAutoLock lock(block->mesh_mutex);
-
-                               scene::SMesh *mesh = block->mesh;
-                               
-                               if(mesh == NULL){
-                                       blocks_in_range_without_mesh++;
-                                       continue;
-                               }
-                       }
-                       
-                       // Limit block count in case of a sudden increase
-                       blocks_would_have_drawn++;
-                       if(blocks_drawn >= m_control.wanted_max_blocks
-                                       && m_control.range_all == false
-                                       && d > m_control.wanted_min_range * BS)
-                               continue;
-                       
-                       // Add to set
-                       drawset[block->getPos()] = block;
-                       
-                       sector_blocks_drawn++;
-                       blocks_drawn++;
+                       const char * data = (const char *)sqlite3_column_blob(m_database_read, 0);
+                       size_t len = sqlite3_column_bytes(m_database_read, 0);
 
-               } // foreach sectorblocks
+                       std::string datastr(data, len);
 
-               if(sector_blocks_drawn != 0)
-                       m_last_drawn_sectors[sp] = true;
-       }
-       } // ScopeProfiler
-       
-       /*
-               Draw the selected MapBlocks
-       */
+                       loadBlock(&datastr, blockpos, sector, false);
 
-       {
-       ScopeProfiler sp(g_profiler, prefix+"drawing blocks", SPT_AVG);
+                       sqlite3_step(m_database_read);
+                       // We should never get more than 1 row, so ok to reset
+                       sqlite3_reset(m_database_read);
 
-       int timecheck_counter = 0;
-       for(core::map<v3s16, MapBlock*>::Iterator
-                       i = drawset.getIterator();
-                       i.atEnd() == false; i++)
-       {
-               {
-                       timecheck_counter++;
-                       if(timecheck_counter > 50)
-                       {
-                               timecheck_counter = 0;
-                               int time2 = time(0);
-                               if(time2 > time1 + 4)
-                               {
-                                       infostream<<"ClientMap::renderMap(): "
-                                               "Rendering takes ages, returning."
-                                               <<std::endl;
-                                       return;
-                               }
-                       }
+                       return getBlockNoCreateNoEx(blockpos);
                }
-               
-               MapBlock *block = i.getNode()->getValue();
-
-               /*
-                       Draw the faces of the block
-               */
-               {
-                       JMutexAutoLock lock(block->mesh_mutex);
+               sqlite3_reset(m_database_read);
 
-                       scene::SMesh *mesh = block->mesh;
-                       assert(mesh);
-                       
-                       u32 c = mesh->getMeshBufferCount();
-                       bool stuff_actually_drawn = false;
-                       for(u32 i=0; i<c; i++)
-                       {
-                               scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
-                               const video::SMaterial& material = buf->getMaterial();
-                               video::IMaterialRenderer* rnd =
-                                               driver->getMaterialRenderer(material.MaterialType);
-                               bool transparent = (rnd && rnd->isTransparent());
-                               // Render transparent on transparent pass and likewise.
-                               if(transparent == is_transparent_pass)
-                               {
-                                       if(buf->getVertexCount() == 0)
-                                               errorstream<<"Block ["<<analyze_block(block)
-                                                               <<"] contains an empty meshbuf"<<std::endl;
-                                       /*
-                                               This *shouldn't* hurt too much because Irrlicht
-                                               doesn't change opengl textures if the old
-                                               material has the same texture.
-                                       */
-                                       driver->setMaterial(buf->getMaterial());
-                                       driver->drawMeshBuffer(buf);
-                                       vertex_count += buf->getVertexCount();
-                                       meshbuffer_count++;
-                                       stuff_actually_drawn = true;
-                               }
-                       }
-                       if(stuff_actually_drawn)
-                               blocks_had_pass_meshbuf++;
-                       else
-                               blocks_without_stuff++;
-               }
-       }
-       } // ScopeProfiler
-       
-       // Log only on solid pass because values are the same
-       if(pass == scene::ESNRP_SOLID){
-               g_profiler->avg("CM: blocks in range", blocks_in_range);
-               g_profiler->avg("CM: blocks occlusion culled", blocks_occlusion_culled);
-               if(blocks_in_range != 0)
-                       g_profiler->avg("CM: blocks in range without mesh (frac)",
-                                       (float)blocks_in_range_without_mesh/blocks_in_range);
-               g_profiler->avg("CM: blocks drawn", blocks_drawn);
+               // Not found in database, try the files
        }
-       
-       g_profiler->avg(prefix+"vertices drawn", vertex_count);
-       if(blocks_had_pass_meshbuf != 0)
-               g_profiler->avg(prefix+"meshbuffers per block",
-                               (float)meshbuffer_count / (float)blocks_had_pass_meshbuf);
-       if(blocks_drawn != 0)
-               g_profiler->avg(prefix+"empty blocks (frac)",
-                               (float)blocks_without_stuff / blocks_drawn);
-
-       m_control.blocks_drawn = blocks_drawn;
-       m_control.blocks_would_have_drawn = blocks_would_have_drawn;
-
-       /*infostream<<"renderMap(): is_transparent_pass="<<is_transparent_pass
-                       <<", rendered "<<vertex_count<<" vertices."<<std::endl;*/
-}
-
-void ClientMap::renderPostFx()
-{
-       // Sadly ISceneManager has no "post effects" render pass, in that case we
-       // could just register for that and handle it in renderMap().
 
-       m_camera_mutex.Lock();
-       v3f camera_position = m_camera_position;
-       m_camera_mutex.Unlock();
-
-       MapNode n = getNodeNoEx(floatToInt(camera_position, BS));
-
-       // - If the player is in a solid node, make everything black.
-       // - If the player is in liquid, draw a semi-transparent overlay.
-       ContentFeatures& features = content_features(n);
-       video::SColor post_effect_color = features.post_effect_color;
-       if(features.solidness == 2 && g_settings->getBool("free_move") == false)
+       // The directory layout we're going to load from.
+       //  1 - original sectors/xxxxzzzz/
+       //  2 - new sectors2/xxx/zzz/
+       //  If we load from anything but the latest structure, we will
+       //  immediately save to the new one, and remove the old.
+       int loadlayout = 1;
+       std::string sectordir1 = getSectorDir(p2d, 1);
+       std::string sectordir;
+       if(fs::PathExists(sectordir1))
        {
-               post_effect_color = video::SColor(255, 0, 0, 0);
+               sectordir = sectordir1;
        }
-       if (post_effect_color.getAlpha() != 0)
+       else
        {
-               // Draw a full-screen rectangle
-               video::IVideoDriver* driver = SceneManager->getVideoDriver();
-               v2u32 ss = driver->getScreenSize();
-               core::rect<s32> rect(0,0, ss.X, ss.Y);
-               driver->draw2DRectangle(post_effect_color, rect);
+               loadlayout = 2;
+               sectordir = getSectorDir(p2d, 2);
        }
-}
 
-bool ClientMap::setTempMod(v3s16 p, NodeMod mod,
-               core::map<v3s16, MapBlock*> *affected_blocks)
-{
-       bool changed = false;
        /*
-               Add it to all blocks touching it
+               Make sure sector is loaded
        */
-       v3s16 dirs[7] = {
-               v3s16(0,0,0), // this
-               v3s16(0,0,1), // back
-               v3s16(0,1,0), // top
-               v3s16(1,0,0), // right
-               v3s16(0,0,-1), // front
-               v3s16(0,-1,0), // bottom
-               v3s16(-1,0,0), // left
-       };
-       for(u16 i=0; i<7; i++)
-       {
-               v3s16 p2 = p + dirs[i];
-               // Block position of neighbor (or requested) node
-               v3s16 blockpos = getNodeBlockPos(p2);
-               MapBlock * blockref = getBlockNoCreateNoEx(blockpos);
-               if(blockref == NULL)
-                       continue;
-               // Relative position of requested node
-               v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
-               if(blockref->setTempMod(relpos, mod))
-               {
-                       changed = true;
-               }
-       }
-       if(changed && affected_blocks!=NULL)
+       MapSector *sector = getSectorNoGenerateNoEx(p2d);
+       if(sector == NULL)
        {
-               for(u16 i=0; i<7; i++)
-               {
-                       v3s16 p2 = p + dirs[i];
-                       // Block position of neighbor (or requested) node
-                       v3s16 blockpos = getNodeBlockPos(p2);
-                       MapBlock * blockref = getBlockNoCreateNoEx(blockpos);
-                       if(blockref == NULL)
-                               continue;
-                       affected_blocks->insert(blockpos, blockref);
+               try{
+                       sector = loadSectorMeta(sectordir, loadlayout != 2);
                }
-       }
-       return changed;
-}
-
-bool ClientMap::clearTempMod(v3s16 p,
-               core::map<v3s16, MapBlock*> *affected_blocks)
-{
-       bool changed = false;
-       v3s16 dirs[7] = {
-               v3s16(0,0,0), // this
-               v3s16(0,0,1), // back
-               v3s16(0,1,0), // top
-               v3s16(1,0,0), // right
-               v3s16(0,0,-1), // front
-               v3s16(0,-1,0), // bottom
-               v3s16(-1,0,0), // left
-       };
-       for(u16 i=0; i<7; i++)
-       {
-               v3s16 p2 = p + dirs[i];
-               // Block position of neighbor (or requested) node
-               v3s16 blockpos = getNodeBlockPos(p2);
-               MapBlock * blockref = getBlockNoCreateNoEx(blockpos);
-               if(blockref == NULL)
-                       continue;
-               // Relative position of requested node
-               v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
-               if(blockref->clearTempMod(relpos))
+               catch(InvalidFilenameException &e)
                {
-                       changed = true;
+                       return NULL;
                }
-       }
-       if(changed && affected_blocks!=NULL)
-       {
-               for(u16 i=0; i<7; i++)
+               catch(FileNotGoodException &e)
                {
-                       v3s16 p2 = p + dirs[i];
-                       // Block position of neighbor (or requested) node
-                       v3s16 blockpos = getNodeBlockPos(p2);
-                       MapBlock * blockref = getBlockNoCreateNoEx(blockpos);
-                       if(blockref == NULL)
-                               continue;
-                       affected_blocks->insert(blockpos, blockref);
+                       return NULL;
                }
-       }
-       return changed;
-}
-
-void ClientMap::expireMeshes(bool only_daynight_diffed)
-{
-       TimeTaker timer("expireMeshes()");
-
-       core::map<v2s16, MapSector*>::Iterator si;
-       si = m_sectors.getIterator();
-       for(; si.atEnd() == false; si++)
-       {
-               MapSector *sector = si.getNode()->getValue();
-
-               core::list< MapBlock * > sectorblocks;
-               sector->getBlocks(sectorblocks);
-               
-               core::list< MapBlock * >::Iterator i;
-               for(i=sectorblocks.begin(); i!=sectorblocks.end(); i++)
+               catch(std::exception &e)
                {
-                       MapBlock *block = *i;
-
-                       if(only_daynight_diffed && dayNightDiffed(block->getPos()) == false)
-                       {
-                               continue;
-                       }
-                       
-                       {
-                               JMutexAutoLock lock(block->mesh_mutex);
-                               if(block->mesh != NULL)
-                               {
-                                       /*block->mesh->drop();
-                                       block->mesh = NULL;*/
-                                       block->setMeshExpired(true);
-                               }
-                       }
+                       return NULL;
                }
        }
-}
 
-void ClientMap::updateMeshes(v3s16 blockpos, u32 daynight_ratio)
-{
-       assert(mapType() == MAPTYPE_CLIENT);
+       /*
+               Make sure file exists
+       */
 
-       try{
-               v3s16 p = blockpos + v3s16(0,0,0);
-               MapBlock *b = getBlockNoCreate(p);
-               b->updateMesh(daynight_ratio);
-               //b->setMeshExpired(true);
-       }
-       catch(InvalidPositionException &e){}
-       // Leading edge
-       try{
-               v3s16 p = blockpos + v3s16(-1,0,0);
-               MapBlock *b = getBlockNoCreate(p);
-               b->updateMesh(daynight_ratio);
-               //b->setMeshExpired(true);
-       }
-       catch(InvalidPositionException &e){}
-       try{
-               v3s16 p = blockpos + v3s16(0,-1,0);
-               MapBlock *b = getBlockNoCreate(p);
-               b->updateMesh(daynight_ratio);
-               //b->setMeshExpired(true);
-       }
-       catch(InvalidPositionException &e){}
-       try{
-               v3s16 p = blockpos + v3s16(0,0,-1);
-               MapBlock *b = getBlockNoCreate(p);
-               b->updateMesh(daynight_ratio);
-               //b->setMeshExpired(true);
-       }
-       catch(InvalidPositionException &e){}
-}
+       std::string blockfilename = getBlockFilename(blockpos);
+       if(fs::PathExists(sectordir+DIR_DELIM+blockfilename) == false)
+               return NULL;
 
-#if 0
-/*
-       Update mesh of block in which the node is, and if the node is at the
-       leading edge, update the appropriate leading blocks too.
-*/
-void ClientMap::updateNodeMeshes(v3s16 nodepos, u32 daynight_ratio)
-{
-       v3s16 dirs[4] = {
-               v3s16(0,0,0),
-               v3s16(-1,0,0),
-               v3s16(0,-1,0),
-               v3s16(0,0,-1),
-       };
-       v3s16 blockposes[4];
-       for(u32 i=0; i<4; i++)
-       {
-               v3s16 np = nodepos + dirs[i];
-               blockposes[i] = getNodeBlockPos(np);
-               // Don't update mesh of block if it has been done already
-               bool already_updated = false;
-               for(u32 j=0; j<i; j++)
-               {
-                       if(blockposes[j] == blockposes[i])
-                       {
-                               already_updated = true;
-                               break;
-                       }
-               }
-               if(already_updated)
-                       continue;
-               // Update mesh
-               MapBlock *b = getBlockNoCreate(blockposes[i]);
-               b->updateMesh(daynight_ratio);
-       }
+       /*
+               Load block and save it to the database
+       */
+       loadBlock(sectordir, blockfilename, sector, true);
+       return getBlockNoCreateNoEx(blockpos);
 }
-#endif
 
-void ClientMap::PrintInfo(std::ostream &out)
+void ServerMap::PrintInfo(std::ostream &out)
 {
-       out<<"ClientMap: ";
+       out<<"ServerMap: ";
 }
 
-#endif // !SERVER
-
 /*
        MapVoxelManipulator
 */
@@ -4278,12 +4031,14 @@ void MapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
        for(s32 y=p_min.Y; y<=p_max.Y; y++)
        for(s32 x=p_min.X; x<=p_max.X; x++)
        {
+               u8 flags = 0;
+               MapBlock *block;
                v3s16 p(x,y,z);
-               core::map<v3s16, bool>::Node *n;
+               std::map<v3s16, u8>::iterator n;
                n = m_loaded_blocks.find(p);
-               if(n != NULL)
+               if(n != m_loaded_blocks.end())
                        continue;
-               
+
                bool block_data_inexistent = false;
                try
                {
@@ -4294,8 +4049,8 @@ void MapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
                                        <<" wanted area: ";
                        a.print(infostream);
                        infostream<<std::endl;*/
-                       
-                       MapBlock *block = m_map->getBlockNoCreate(p);
+
+                       block = m_map->getBlockNoCreate(p);
                        if(block->isDummy())
                                block_data_inexistent = true;
                        else
@@ -4308,6 +4063,8 @@ void MapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
 
                if(block_data_inexistent)
                {
+                       flags |= VMANIP_BLOCK_DATA_INEXIST;
+
                        VoxelArea a(p*MAP_BLOCKSIZE, (p+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
                        // Fill with VOXELFLAG_INEXISTENT
                        for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
@@ -4317,8 +4074,13 @@ void MapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
                                memset(&m_flags[i], VOXELFLAG_INEXISTENT, MAP_BLOCKSIZE);
                        }
                }
+               /*else if (block->getNode(0, 0, 0).getContent() == CONTENT_IGNORE)
+               {
+                       // Mark that block was loaded as blank
+                       flags |= VMANIP_BLOCK_CONTAINS_CIGNORE;
+               }*/
 
-               m_loaded_blocks.insert(p, !block_data_inexistent);
+               m_loaded_blocks[p] = flags;
        }
 
        //infostream<<"emerge done"<<std::endl;
@@ -4330,16 +4092,16 @@ void MapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
                  run on background.
 */
 void MapVoxelManipulator::blitBack
-               (core::map<v3s16, MapBlock*> & modified_blocks)
+               (std::map<v3s16, MapBlock*> & modified_blocks)
 {
        if(m_area.getExtent() == v3s16(0,0,0))
                return;
-       
+
        //TimeTaker timer1("blitBack");
 
        /*infostream<<"blitBack(): m_loaded_blocks.size()="
                        <<m_loaded_blocks.size()<<std::endl;*/
-       
+
        /*
                Initialize block cache
        */
@@ -4358,9 +4120,9 @@ void MapVoxelManipulator::blitBack
                        continue;
 
                MapNode &n = m_data[m_area.index(p)];
-                       
+
                v3s16 blockpos = getNodeBlockPos(p);
-               
+
                try
                {
                        // Get block
@@ -4369,7 +4131,7 @@ void MapVoxelManipulator::blitBack
                                blockpos_last = blockpos;
                                block_checked_in_modified = false;
                        }
-                       
+
                        // Calculate relative position in block
                        v3s16 relpos = p - blockpos * MAP_BLOCKSIZE;
 
@@ -4379,7 +4141,7 @@ void MapVoxelManipulator::blitBack
 
                        //m_map->setNode(m_area.MinEdge + p, n);
                        block->setNode(relpos, n);
-                       
+
                        /*
                                Make sure block is in modified_blocks
                        */
@@ -4422,7 +4184,7 @@ void ManualMapVoxelManipulator::initialEmerge(
 
        VoxelArea block_area_nodes
                        (p_min*MAP_BLOCKSIZE, (p_max+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
-       
+
        u32 size_MB = block_area_nodes.getVolume()*4/1000000;
        if(size_MB >= 1)
        {
@@ -4438,18 +4200,20 @@ void ManualMapVoxelManipulator::initialEmerge(
        for(s32 y=p_min.Y; y<=p_max.Y; y++)
        for(s32 x=p_min.X; x<=p_max.X; x++)
        {
+               u8 flags = 0;
+               MapBlock *block;
                v3s16 p(x,y,z);
-               core::map<v3s16, bool>::Node *n;
+               std::map<v3s16, u8>::iterator n;
                n = m_loaded_blocks.find(p);
-               if(n != NULL)
+               if(n != m_loaded_blocks.end())
                        continue;
-               
+
                bool block_data_inexistent = false;
                try
                {
                        TimeTaker timer1("emerge load", &emerge_load_time);
 
-                       MapBlock *block = m_map->getBlockNoCreate(p);
+                       block = m_map->getBlockNoCreate(p);
                        if(block->isDummy())
                                block_data_inexistent = true;
                        else
@@ -4462,6 +4226,8 @@ void ManualMapVoxelManipulator::initialEmerge(
 
                if(block_data_inexistent)
                {
+                       flags |= VMANIP_BLOCK_DATA_INEXIST;
+                       
                        /*
                                Mark area inexistent
                        */
@@ -4474,48 +4240,41 @@ void ManualMapVoxelManipulator::initialEmerge(
                                memset(&m_flags[i], VOXELFLAG_INEXISTENT, MAP_BLOCKSIZE);
                        }
                }
+               /*else if (block->getNode(0, 0, 0).getContent() == CONTENT_IGNORE)
+               {
+                       // Mark that block was loaded as blank
+                       flags |= VMANIP_BLOCK_CONTAINS_CIGNORE;
+               }*/
 
-               m_loaded_blocks.insert(p, !block_data_inexistent);
+               m_loaded_blocks[p] = flags;
        }
 }
 
 void ManualMapVoxelManipulator::blitBackAll(
-               core::map<v3s16, MapBlock*> * modified_blocks)
+               std::map<v3s16, MapBlock*> * modified_blocks)
 {
        if(m_area.getExtent() == v3s16(0,0,0))
                return;
-       
+
        /*
                Copy data of all blocks
        */
-       for(core::map<v3s16, bool>::Iterator
-                       i = m_loaded_blocks.getIterator();
-                       i.atEnd() == false; i++)
+       for(std::map<v3s16, u8>::iterator
+                       i = m_loaded_blocks.begin();
+                       i != m_loaded_blocks.end(); ++i)
        {
-               v3s16 p = i.getNode()->getKey();
-               bool existed = i.getNode()->getValue();
-               if(existed == false)
-               {
-                       // The Great Bug was found using this
-                       /*infostream<<"ManualMapVoxelManipulator::blitBackAll: "
-                                       <<"Inexistent ("<<p.X<<","<<p.Y<<","<<p.Z<<")"
-                                       <<std::endl;*/
-                       continue;
-               }
+               v3s16 p = i->first;
                MapBlock *block = m_map->getBlockNoCreateNoEx(p);
-               if(block == NULL)
+               bool existed = !(i->second & VMANIP_BLOCK_DATA_INEXIST);
+               if(existed == false)
                {
-                       infostream<<"WARNING: "<<__FUNCTION_NAME
-                                       <<": got NULL block "
-                                       <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
-                                       <<std::endl;
                        continue;
                }
 
                block->copyFrom(*this);
 
                if(modified_blocks)
-                       modified_blocks->insert(p, block);
+                       (*modified_blocks)[p] = block;
        }
 }