]> git.lizzy.rs Git - dragonfireclient.git/blobdiff - src/map.cpp
Fix typo in lua_api.txt
[dragonfireclient.git] / src / map.cpp
index e0175a4ab31dc0f4d7a3bfe5dfe25e406a3fec48..cea20b0d3b0dd8ca1c50dd63ab93ea02deb37e3e 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.
 */
@@ -21,36 +21,44 @@ 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 "serialization.h"
 #include "nodemetadata.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 "util/mathconstants.h"
+#include "rollback_interface.h"
+#include "environment.h"
+#include "emerge.h"
+#include "mapgen_v6.h"
+#include "biome.h"
+#include "config.h"
+#include "server.h"
+#include "database.h"
+#include "database-dummy.h"
+#include "database-sqlite3.h"
+#if USE_LEVELDB
+#include "database-leveldb.h"
+#endif
 
 #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
@@ -76,34 +84,30 @@ 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);
        }
 }
 
@@ -113,14 +117,14 @@ 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;
@@ -138,7 +142,7 @@ MapSector * Map::getSectorNoGenerate(v2s16 p)
        MapSector *sector = getSectorNoGenerateNoEx(p);
        if(sector == NULL)
                throw InvalidPositionException();
-       
+
        return sector;
 }
 
@@ -153,7 +157,7 @@ MapBlock * Map::getBlockNoCreateNoEx(v3s16 p3d)
 }
 
 MapBlock * Map::getBlockNoCreate(v3s16 p3d)
-{      
+{
        MapBlock *block = getBlockNoCreateNoEx(p3d);
        if(block == NULL)
                throw InvalidPositionException();
@@ -239,9 +243,9 @@ 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();
 
@@ -253,15 +257,13 @@ 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
@@ -270,12 +272,13 @@ 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){
@@ -295,12 +298,12 @@ 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++)
@@ -357,7 +360,7 @@ void Map::unspreadLight(enum LightBank bank,
                                                n2.setLight(bank, 0, nodemgr);
                                                block->setNode(relpos, n2);
 
-                                               unlighted_nodes.insert(n2pos, current_light);
+                                               unlighted_nodes[n2pos] = current_light;
                                                changed = true;
 
                                                /*
@@ -376,16 +379,16 @@ 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;
                                }
@@ -411,11 +414,11 @@ 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);
 }
@@ -425,8 +428,8 @@ 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();
 
@@ -444,9 +447,7 @@ 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
@@ -456,12 +457,10 @@ 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
@@ -528,8 +527,7 @@ void Map::spreadLight(enum LightBank bank,
                                */
                                if(n2.getLight(bank, nodemgr) > undiminish_light(oldlight))
                                {
-                                       lighted_nodes.insert(n2pos, true);
-                                       //lighted_nodes.push_back(n2pos);
+                                       lighted_nodes.insert(n2pos);
                                        changed = true;
                                }
                                /*
@@ -542,8 +540,7 @@ void Map::spreadLight(enum LightBank bank,
                                        {
                                                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;
                                        }
                                }
@@ -552,9 +549,9 @@ 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;
                                }
@@ -580,10 +577,10 @@ 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);
 }
 
@@ -638,7 +635,7 @@ 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();
 
@@ -665,7 +662,7 @@ s16 Map::propagateSunlight(v3s16 start,
                        n.setLight(LIGHTBANK_DAY, LIGHT_SUN, nodemgr);
                        block->setNode(relpos, n);
 
-                       modified_blocks.insert(blockpos, block);
+                       modified_blocks[blockpos] = block;
                }
                else
                {
@@ -677,8 +674,8 @@ 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();
 
@@ -691,17 +688,21 @@ 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;
+
+       int num_bottom_invalid = 0;
 
-       core::map<v3s16, MapBlock*>::Iterator i;
-       i = a_blocks.getIterator();
-       for(; i.atEnd() == false; i++)
        {
-               MapBlock *block = i.getNode()->getValue();
+       //TimeTaker t("first stuff");
+
+       for(std::map<v3s16, MapBlock*>::iterator i = a_blocks.begin();
+               i != a_blocks.end(); ++i)
+       {
+               MapBlock *block = i->second;
 
                for(;;)
                {
@@ -710,9 +711,9 @@ 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
@@ -724,21 +725,24 @@ void Map::updateLighting(enum LightBank bank,
 
                                try{
                                        v3s16 p(x,y,z);
-                                       MapNode n = block->getNode(v3s16(x,y,z));
+                                       MapNode n = block->getNode(p);
                                        u8 oldlight = n.getLight(bank, nodemgr);
                                        n.setLight(bank, 0, nodemgr);
-                                       block->setNode(v3s16(x,y,z), n);
+                                       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)
@@ -757,6 +761,9 @@ 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;
@@ -789,7 +796,9 @@ void Map::updateLighting(enum LightBank bank,
 
                }
        }
-       
+
+       }
+
        /*
                Enable this to disable proper lighting for speeding up map
                generation for testing or whatever
@@ -809,38 +818,43 @@ 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++)
@@ -874,6 +888,7 @@ void Map::updateLighting(enum LightBank bank,
                        // Lighting of block will be updated completely
                        block->setLightingExpired(false);
                }
+               }
 
                {
                        //TimeTaker timer("unSpreadLight");
@@ -890,12 +905,13 @@ 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);
@@ -903,21 +919,21 @@ 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::map<v3s16, MapBlock*> &modified_blocks)
 {
-       INodeDefManager *nodemgr = m_gamedef->ndef();
+       INodeDefManager *ndef = m_gamedef->ndef();
 
        /*PrintInfo(m_dout);
        m_dout<<DTIME<<"Map::addNodeAndUpdate(): p=("
@@ -931,10 +947,15 @@ 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,
@@ -945,7 +966,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        try{
                MapNode topnode = getNode(toppos);
 
-               if(topnode.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN)
+               if(topnode.getLight(LIGHTBANK_DAY, ndef) != LIGHT_SUN)
                        node_under_sunlight = false;
        }
        catch(InvalidPositionException &e)
@@ -965,13 +986,13 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
        {
                enum LightBank bank = banks[i];
 
-               u8 lightwas = getNode(p).getLight(bank, nodemgr);
+               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));
 
@@ -982,38 +1003,29 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                // light again into this.
                unLightNeighbors(bank, p, lightwas, light_sources, modified_blocks);
 
-               n.setLight(bank, 0, nodemgr);
+               n.setLight(bank, 0, ndef);
        }
 
        /*
                If node lets sunlight through and is under sunlight, it has
                sunlight too.
        */
-       if(node_under_sunlight && nodemgr->get(n).sunlight_propagates)
+       if(node_under_sunlight && ndef->get(n).sunlight_propagates)
        {
-               n.setLight(LIGHTBANK_DAY, LIGHT_SUN, nodemgr);
+               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
        */
-       
-       std::string metadata_name = nodemgr->get(n).metadata_name;
-       if(metadata_name != ""){
-               NodeMetadata *meta = NodeMetadata::create(metadata_name, m_gamedef);
-               if(!meta){
-                       errorstream<<"Failed to create node metadata \""
-                                       <<metadata_name<<"\""<<std::endl;
-               } else {
-                       setNodeMetadata(p, meta);
-               }
-       }
+
+       setNode(p, n);
 
        /*
                If node is under sunlight and doesn't let sunlight through,
@@ -1022,7 +1034,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                TODO: This could be optimized by mass-unlighting instead
                          of looping
        */
-       if(node_under_sunlight && !nodemgr->get(n).sunlight_propagates)
+       if(node_under_sunlight && !ndef->get(n).sunlight_propagates)
        {
                s16 y = p.Y - 1;
                for(;; y--){
@@ -1038,12 +1050,12 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                                break;
                        }
 
-                       if(n2.getLight(LIGHTBANK_DAY, nodemgr) == LIGHT_SUN)
+                       if(n2.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
                        {
                                unLightNeighbors(LIGHTBANK_DAY,
-                                               n2pos, n2.getLight(LIGHTBANK_DAY, nodemgr),
+                                               n2pos, n2.getLight(LIGHTBANK_DAY, ndef),
                                                light_sources, modified_blocks);
-                               n2.setLight(LIGHTBANK_DAY, 0, nodemgr);
+                               n2.setLight(LIGHTBANK_DAY, 0, ndef);
                                setNode(n2pos, n2);
                        }
                        else
@@ -1064,17 +1076,28 @@ 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);
        }
 
        /*
                Add neighboring liquid nodes and the node itself if it is
                liquid (=water node was added) to transform queue.
+               note: todo: for liquid_finite enough to add only self node
        */
        v3s16 dirs[7] = {
                v3s16(0,0,0), // self
@@ -1093,7 +1116,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
                v3s16 p2 = p + dirs[i];
 
                MapNode n2 = getNode(p2);
-               if(nodemgr->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
+               if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
                {
                        m_transforming_liquid.push_back(p2);
                }
@@ -1107,9 +1130,9 @@ 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 *nodemgr = m_gamedef->ndef();
+       INodeDefManager *ndef = m_gamedef->ndef();
 
        /*PrintInfo(m_dout);
        m_dout<<DTIME<<"Map::removeNodeAndUpdate(): p=("
@@ -1122,6 +1145,11 @@ 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.
@@ -1129,14 +1157,14 @@ void Map::removeNodeAndUpdate(v3s16 p,
        try{
                MapNode topnode = getNode(toppos);
 
-               if(topnode.getLight(LIGHTBANK_DAY, nodemgr) != 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[] =
        {
@@ -1151,7 +1179,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                        Unlight neighbors (in case the node is a light source)
                */
                unLightNeighbors(bank, p,
-                               getNode(p).getLight(bank, nodemgr),
+                               getNode(p).getLight(bank, ndef),
                                light_sources, modified_blocks);
        }
 
@@ -1184,7 +1212,7 @@ 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
@@ -1213,7 +1241,7 @@ 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, nodemgr);
+                       n.setLight(LIGHTBANK_DAY, 0, ndef);
                        setNode(p, n);
                }
                catch(InvalidPositionException &e)
@@ -1229,7 +1257,7 @@ 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)
@@ -1240,17 +1268,28 @@ 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);
        }
 
        /*
                Add neighboring liquid nodes and this node to transform queue.
                (it's vital for the node itself to get updated last.)
+               note: todo: for liquid_finite enough to add only self node
        */
        v3s16 dirs[7] = {
                v3s16(0,0,1), // back
@@ -1269,7 +1308,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
                v3s16 p2 = p + dirs[i];
 
                MapNode n2 = getNode(p2);
-               if(nodemgr->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
+               if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
                {
                        m_transforming_liquid.push_back(p2);
                }
@@ -1289,15 +1328,15 @@ bool Map::addNodeWithEvent(v3s16 p, MapNode n)
 
        bool succeeded = true;
        try{
-               core::map<v3s16, MapBlock*> modified_blocks;
+               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){
@@ -1317,15 +1356,15 @@ 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){
@@ -1337,12 +1376,12 @@ 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){}
@@ -1350,21 +1389,21 @@ 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){}
@@ -1372,21 +1411,21 @@ 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){}
@@ -1398,39 +1437,37 @@ 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);
-       
+
        // Profile modified reasons
        Profiler modprofiler;
-       
-       core::list<v2s16> sector_deletion_queue;
+
+       std::list<v2s16> sector_deletion_queue;
        u32 deleted_blocks_count = 0;
        u32 saved_blocks_count = 0;
        u32 block_count_all = 0;
 
-       core::map<v2s16, MapSector*>::Iterator si;
-
        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();
 
@@ -1460,14 +1497,14 @@ void Map::timerUpdate(float dtime, float unload_timeout,
 
                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:
@@ -1485,17 +1522,22 @@ void Map::timerUpdate(float dtime, float unload_timeout,
        }
 }
 
-void Map::deleteSectors(core::list<v2s16> &list)
+void Map::unloadUnreferencedBlocks(std::list<v3s16> *unloaded_blocks)
+{
+       timerUpdate(0.0, -1.0, unloaded_blocks);
+}
+
+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;
        }
 }
@@ -1521,7 +1563,7 @@ void Map::unloadUnusedData(float timeout,
                                i != blocks.end(); i++)
                {
                        MapBlock *block = (*i);
-                       
+
                        if(block->getUsageTimer() > timeout)
                        {
                                // Save if modified
@@ -1573,10 +1615,395 @@ 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();
+
+       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, must_reflow_second;
+
+       // List of MapBlocks that will require a lighting update (due to lava)
+       std::map<v3s16, MapBlock*> lighting_modified_blocks;
+
+       u16 loop_max = g_settings->getU16("liquid_loop_max");
+
+       //if (m_transforming_liquid.size() > 0) errorstream << "Liquid queue size="<<m_transforming_liquid.size()<<std::endl;
+
+       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 >= loop_max)
+                       break;
+               loopcount++;
+               /*
+                       Get a queued transforming liquid node
+               */
+               v3s16 p0 = m_transforming_liquid.pop_front();
+               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_7dirs;
+               for (u16 i = 0; i < 7; i++) {
+                       NeighborType nt = NEIGHBOR_SAME_LEVEL;
+                       switch (i) {
+                               case D_TOP:
+                                       nt = NEIGHBOR_UPPER;
+                                       break;
+                               case D_BOTTOM:
+                                       nt = NEIGHBOR_LOWER;
+                                       break;
+                       }
+                       v3s16 npos = p0 + dirs[i];
+
+                       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) {
+                                               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_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] = nb.n.getLevel(nodemgr); //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_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.getLevel(nodemgr); //(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;
+                       */
+               }
+
+               if (liquid_kind == CONTENT_IGNORE ||
+                       !neighbors[D_SELF].l ||
+                       total_level <= 0)
+                       continue;
+
+               // 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) && neighbors[D_BOTTOM].n.getContent() == CONTENT_IGNORE && !(loopcount % 3)) {
+                       --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) {
+                               if (loopcount % 3 || liquid_levels[ii] <= 0){
+                                       if (liquid_levels[ii] > liquid_levels_want[ii]) {
+                                               ++liquid_levels_want[ii];
+                                               --total_level;
+                                       }
+                               } else if (neighbors[ii].l > 0){
+                                               ++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.getLevel(nodemgr) == (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
+                                ))
+                          )*/
+                       if (liquid_levels[i] == new_node_level)
+                       {
+                               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(liquid_kind_flowing);
+                       n0.setLevel(nodemgr, new_node_level);
+                       // 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);
@@ -1590,14 +2017,16 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
 
        // 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)
-       core::map<v3s16, MapBlock*> lighting_modified_blocks;
+       std::map<v3s16, MapBlock*> lighting_modified_blocks;
+
+       u16 loop_max = g_settings->getU16("liquid_loop_max");
 
        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 >= loop_max)
                        break;
                loopcount++;
 
@@ -1612,7 +2041,7 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                        Collect information about current node
                 */
                s8 liquid_level = -1;
-               u8 liquid_kind = CONTENT_IGNORE;
+               content_t liquid_kind = CONTENT_IGNORE;
                LiquidType liquid_type = nodemgr->get(n0).liquid_type;
                switch (liquid_type) {
                        case LIQUID_SOURCE:
@@ -1675,7 +2104,7 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                                        }
                                        break;
                                case LIQUID_SOURCE:
-                                       // if this node is not (yet) of a liquid type, choose the first liquid type we encounter 
+                                       // 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) {
@@ -1707,15 +2136,18 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                content_t new_node_content;
                s8 new_node_level = -1;
                s8 max_node_level = -1;
-               if (num_sources >= 2 || liquid_type == LIQUID_SOURCE) {
+               u8 range = rangelim(nodemgr->get(liquid_kind).liquid_range, 0, LIQUID_LEVEL_MAX+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) {
+               } 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;
+                       if (new_node_level < (LIQUID_LEVEL_MAX+1-range))
+                               new_node_content = CONTENT_AIR;
                } else {
                        // no surrounding sources, so get the maximum level that can flow into this node
                        for (u16 i = 0; i < num_flows; i++) {
@@ -1756,7 +2188,7 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                        } else
                                new_node_level = max_node_level;
 
-                       if (new_node_level >= 0)
+                       if (max_node_level >= (LIQUID_LEVEL_MAX+1-range))
                                new_node_content = liquid_kind;
                        else
                                new_node_content = CONTENT_AIR;
@@ -1776,6 +2208,7 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
                /*
                        update the current node
                 */
+               MapNode n00 = n0;
                //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
@@ -1785,14 +2218,38 @@ 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);
-               v3s16 blockpos = getNodeBlockPos(p0);
-               MapBlock *block = getBlockNoCreateNoEx(blockpos);
-               if(block != NULL) {
-                       modified_blocks.insert(blockpos, block);
-                       // If node emits light, MapBlock requires lighting update
-                       if(nodemgr->get(n0).light_source != 0)
-                               lighting_modified_blocks[block->getPos()] = block;
+
+               // 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 new or old node emits light, MapBlock requires lighting update
+                       if(nodemgr->get(n0).light_source != 0 ||
+                                       nodemgr->get(n00).light_source != 0)
+                               lighting_modified_blocks[block->getPos()] = block;
                }
 
                /*
@@ -1838,7 +2295,7 @@ NodeMetadata* Map::getNodeMetadata(v3s16 p)
                                <<std::endl;
                return NULL;
        }
-       NodeMetadata *meta = block->m_node_metadata->get(p_rel);
+       NodeMetadata *meta = block->m_node_metadata.get(p_rel);
        return meta;
 }
 
@@ -1858,7 +2315,7 @@ void Map::setNodeMetadata(v3s16 p, NodeMetadata *meta)
                                <<std::endl;
                return;
        }
-       block->m_node_metadata->set(p_rel, meta);
+       block->m_node_metadata.set(p_rel, meta);
 }
 
 void Map::removeNodeMetadata(v3s16 p)
@@ -1872,64 +2329,106 @@ void Map::removeNodeMetadata(v3s16 p)
                                <<std::endl;
                return;
        }
-       block->m_node_metadata->remove(p_rel);
+       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;
+}
+
+void Map::setNodeTimer(v3s16 p, NodeTimer t)
+{
+       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);
+       }
+       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)
+       {
+               infostream<<"WARNING: Map::removeNodeTimer(): Block not found"
+                               <<std::endl;
+               return;
+       }
+       block->m_node_timers.remove(p_rel);
+}
+
+s16 Map::getHeat(v3s16 p)
+{
+       MapBlock *block = getBlockNoCreateNoEx(getNodeBlockPos(p));
+       if(block != NULL) {
+               return block->heat;
+       }
+       //errorstream << "No heat for " << p.X<<"," << p.Z << std::endl;
+       return 0;
+}
+
+s16 Map::getHumidity(v3s16 p)
+{
+       MapBlock *block = getBlockNoCreateNoEx(getNodeBlockPos(p));
+       if(block != NULL) {
+               return block->humidity;
        }
+       //errorstream << "No humidity for " << p.X<<"," << p.Z << std::endl;
+       return 0;
 }
 
 /*
        ServerMap
 */
-
-ServerMap::ServerMap(std::string savedir, IGameDef *gamedef):
+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)
+       m_map_metadata_changed(true)
 {
        verbosestream<<__FUNCTION_NAME<<std::endl;
 
-       //m_chunksize = 8; // Takes a few seconds
+       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));
-       }
-       else
-       {
-               m_seed = g_settings->getU64("fixed_map_seed");
+               m_seed = (((u64)(myrand() & 0xffff) << 0)
+                               | ((u64)(myrand() & 0xffff) << 16)
+                               | ((u64)(myrand() & 0xffff) << 32)
+                               | ((u64)(myrand() & 0xffff) << 48));
+               m_mgparams->seed = m_seed;
        }
 
        /*
@@ -1943,6 +2442,28 @@ ServerMap::ServerMap(std::string savedir, IGameDef *gamedef):
                Try to load map; if not found, create a new one.
        */
 
+       // Determine which database backend to use
+       std::string conf_path = savedir + DIR_DELIM + "world.mt";
+       Settings conf;
+       bool succeeded = conf.readConfigFile(conf_path.c_str());
+       if (!succeeded || !conf.exists("backend")) {
+               // fall back to sqlite3
+               dbase = new Database_SQLite3(this, savedir);
+               conf.set("backend", "sqlite3");
+       } else {
+               std::string backend = conf.get("backend");
+               if (backend == "dummy")
+                       dbase = new Database_Dummy(this);
+               else if (backend == "sqlite3")
+                       dbase = new Database_SQLite3(this, savedir);
+               #if USE_LEVELDB
+               else if (backend == "leveldb")
+                       dbase = new Database_LevelDB(this, savedir);
+               #endif
+               else
+                       throw BaseException("Unknown map backend");
+       }
+
        m_savedir = savedir;
        m_map_saving_enabled = false;
 
@@ -1964,6 +2485,10 @@ ServerMap::ServerMap(std::string savedir, IGameDef *gamedef):
                                        // 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."
@@ -2030,12 +2555,7 @@ ServerMap::~ServerMap()
        /*
                Close database if it was opened
        */
-       if(m_database_read)
-               sqlite3_finalize(m_database_read);
-       if(m_database_write)
-               sqlite3_finalize(m_database_write);
-       if(m_database)
-               sqlite3_close(m_database);
+       delete(dbase);
 
 #if 0
        /*
@@ -2048,26 +2568,35 @@ 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();
 
        /*
@@ -2075,18 +2604,21 @@ void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
        */
        {
                //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);
@@ -2100,7 +2632,7 @@ 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);
                                }
 
@@ -2111,54 +2643,72 @@ 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);
 
        // Add the area
        {
                //TimeTaker timer("initBlockMake() initialEmerge");
-               data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max);
+               data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max, false);
        }
+       
+       // 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=-1; x<=1; x++)
-       for(s16 z=-1; z<=1; z++)
-       for(s16 y=-1; y<=1; y++)
-       {
-               v3s16 p(blockpos.X+x, blockpos.Y+y, blockpos.Z+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(x, y, z);
                // Load from disk if not already in memory
                emergeBlock(p, false);
        }
@@ -2173,9 +2723,7 @@ 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
@@ -2185,150 +2733,146 @@ 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,
-                               "finishBlockMake updateDayNightDiff");
+                               "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(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;*/
+                       
+       /*
+               Update weather data in blocks
+       */
+       ServerEnvironment *senv = &((Server *)m_gamedef)->getEnv();
+       if (senv->m_use_weather) {
+               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);
+                       updateBlockHeat(senv, p * MAP_BLOCKSIZE, NULL);
+                       updateBlockHumidity(senv, p * MAP_BLOCKSIZE, NULL);
+               }
+       } else {
+               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++)
+               {
+                       MapBlock *block = getBlockNoCreateNoEx(v3s16(x, y, z));
+                       block->heat     = HEAT_UNDEFINED;
+                       block->humidity = HUMIDITY_UNDEFINED;
+                       block->weather_update_time = 0;
+               }
+       }
+       
 #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 +2882,9 @@ MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
        }
 #endif
 
+       MapBlock *block = getBlockNoCreateNoEx(blockpos_requested);
+       assert(block);
+
        return block;
 }
 
@@ -2346,14 +2893,14 @@ 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 +2933,44 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
        /*
                Generate blank sector
        */
-       
+
        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 +2983,7 @@ MapBlock * ServerMap::generateBlock(
        /*
                Create block make data
        */
-       mapgen::BlockMakeData data;
+       BlockMakeData data;
        initBlockMake(&data, p);
 
        /*
@@ -2443,7 +2991,8 @@ 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
@@ -2512,12 +3061,13 @@ 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
        */
@@ -2528,7 +3078,7 @@ 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;
        /*
@@ -2573,15 +3123,16 @@ 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)
@@ -2594,9 +3145,15 @@ 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)
                {
@@ -2605,19 +3162,19 @@ 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;
 }
@@ -2658,89 +3215,20 @@ 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;
        //return (s16)level;
 }
 
-void ServerMap::createDatabase() {
-       int e;
-       assert(m_database);
-       e = sqlite3_exec(m_database,
-               "CREATE TABLE IF NOT EXISTS `blocks` ("
-                       "`pos` INT NOT NULL PRIMARY KEY,"
-                       "`data` BLOB"
-               ");"
-       , NULL, NULL, NULL);
-       if(e == SQLITE_ABORT)
-               throw FileNotGoodException("Could not create database structure");
-       else
-               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<<"ServerMap: Database opened"<<std::endl;
-       }
-}
-
 bool ServerMap::loadFromFolders() {
-       if(!m_database && !fs::PathExists(m_savedir + DIR_DELIM + "map.sqlite"))
+       if(!dbase->Initialized() && !fs::PathExists(m_savedir + DIR_DELIM + "map.sqlite")) // ?
                return true;
        return false;
 }
 
-sqlite3_int64 ServerMap::getBlockAsInteger(const v3s16 pos) {
-       return (sqlite3_int64)pos.Z*16777216 +
-               (sqlite3_int64)pos.Y*4096 + (sqlite3_int64)pos.X;
-}
-
 void ServerMap::createDirs(std::string path)
 {
        if(fs::CreateAllDirs(path) == false)
@@ -2777,17 +3265,18 @@ v2s16 ServerMap::getSectorPos(std::string dirname)
 {
        unsigned int x, y;
        int r;
-       size_t spos = dirname.rfind(DIR_DELIM_C) + 1;
-       assert(spos != std::string::npos);
-       if(dirname.size() - spos == 8)
+       std::string component;
+       fs::RemoveLastPathComponent(dirname, &component, 1);
+       if(component.size() == 8)
        {
                // Old layout
-               r = sscanf(dirname.substr(spos).c_str(), "%4x%4x", &x, &y);
+               r = sscanf(component.c_str(), "%4x%4x", &x, &y);
        }
-       else if(dirname.size() - spos == 3)
+       else if(component.size() == 3)
        {
                // New layout
-               r = sscanf(dirname.substr(spos-4).c_str(), "%3x" DIR_DELIM "%3x", &x, &y);
+               fs::RemoveLastPathComponent(dirname, &component, 2);
+               r = sscanf(component.c_str(), "%3x" DIR_DELIM "%3x", &x, &y);
                // Sign-extend the 12 bit values up to 16 bits...
                if(x&0x800) x|=0xF000;
                if(y&0x800) y|=0xF000;
@@ -2830,11 +3319,11 @@ void ServerMap::save(ModifiedState save_level)
                infostream<<"WARNING: Not saving map, saving disabled."<<std::endl;
                return;
        }
-       
+
        if(save_level == MOD_STATE_CLEAN)
                infostream<<"ServerMap: Saving whole map, this can take time."
                                <<std::endl;
-       
+
        if(m_map_metadata_changed || save_level == MOD_STATE_CLEAN)
        {
                saveMapMeta();
@@ -2842,36 +3331,36 @@ void ServerMap::save(ModifiedState save_level)
 
        // Profile modified reasons
        Profiler modprofiler;
-       
+
        u32 sector_meta_count = 0;
        u32 block_count = 0;
        u32 block_count_all = 0; // Number of blocks in memory
-       
+
        // Don't do anything with sqlite unless something is really saved
        bool save_started = false;
 
-       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)
        {
-               ServerMapSector *sector = (ServerMapSector*)i.getNode()->getValue();
+               ServerMapSector *sector = (ServerMapSector*)i->second;
                assert(sector->getId() == MAPSECTOR_SERVER);
-       
+
                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;
-               
-               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() >= save_level)
+                       if(block->getModified() >= (u32)save_level)
                        {
                                // Lazy beginSave()
                                if(!save_started){
@@ -2912,47 +3401,30 @@ void ServerMap::save(ModifiedState save_level)
        }
 }
 
-static s32 unsignedToSigned(s32 i, s32 max_positive)
-{
-       if(i < max_positive)
-               return i;
-       else
-               return i - 2*max_positive;
-}
-
-// modulo of a negative number does not work consistently in C
-static sqlite3_int64 pythonmodulo(sqlite3_int64 i, sqlite3_int64 mod)
-{
-       if(i >= 0)
-               return i % mod;
-       return mod - ((-i) % mod);
-}
-
-v3s16 ServerMap::getIntegerAsBlock(sqlite3_int64 i)
-{
-       s32 x = unsignedToSigned(pythonmodulo(i, 4096), 2048);
-       i = (i - x) / 4096;
-       s32 y = unsignedToSigned(pythonmodulo(i, 4096), 2048);
-       i = (i - y) / 4096;
-       s32 z = unsignedToSigned(pythonmodulo(i, 4096), 2048);
-       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;
        }
-       
+       dbase->listAllLoadableBlocks(dst);
+}
+
+void ServerMap::listAllLoadedBlocks(std::list<v3s16> &dst)
+{
+       for(std::map<v2s16, MapSector*>::iterator si = m_sectors.begin();
+               si != m_sectors.end(); ++si)
        {
-               verifyDatabase();
-               
-               while(sqlite3_step(m_database_list) == SQLITE_ROW)
+               MapSector *sector = si->second;
+
+               std::list<MapBlock*> blocks;
+               sector->getBlocks(blocks);
+
+               for(std::list<MapBlock*>::iterator i = blocks.begin();
+                               i != blocks.end(); ++i)
                {
-                       sqlite3_int64 block_i = sqlite3_column_int64(m_database_list, 0);
-                       v3s16 p = getIntegerAsBlock(block_i);
-                       //dstream<<"block_i="<<block_i<<" p="<<PP(p)<<std::endl;
+                       MapBlock *block = (*i);
+                       v3s16 p = block->getPos();
                        dst.push_back(p);
                }
        }
@@ -2961,36 +3433,37 @@ void ServerMap::listAllLoadableBlocks(core::list<v3s16> &dst)
 void ServerMap::saveMapMeta()
 {
        DSTACK(__FUNCTION_NAME);
-       
+
        /*infostream<<"ServerMap::saveMapMeta(): "
                        <<"seed="<<m_seed
                        <<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)
+       std::ostringstream ss(std::ios_base::binary);
+
+       Settings params;
+
+       m_emerge->setParamsToSettings(&params);
+       params.writeLines(ss);
+
+       ss<<"[end_of_params]\n";
+
+       if(!fs::safeWriteToFile(fullpath, ss.str()))
        {
                infostream<<"ERROR: ServerMap::saveMapMeta(): "
-                               <<"could not open"<<fullpath<<std::endl;
-               throw FileNotGoodException("Cannot open chunk metadata");
+                               <<"could not write "<<fullpath<<std::endl;
+               throw FileNotGoodException("Cannot save chunk metadata");
        }
-       
-       Settings params;
-       params.setU64("seed", m_seed);
-
-       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;*/
 
@@ -3017,8 +3490,27 @@ void ServerMap::loadMapMeta()
                        break;
                params.parseConfigLine(line);
        }
-
-       m_seed = params.getU64("seed");
+       
+       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 = read_seed(params.get("seed").c_str());
+                       m_mgparams->seed = m_seed;
+               }
+       }
 
        verbosestream<<"ServerMap::loadMapMeta(): "<<"seed="<<m_seed<<std::endl;
 }
@@ -3027,19 +3519,20 @@ void ServerMap::saveSectorMeta(ServerMapSector *sector)
 {
        DSTACK(__FUNCTION_NAME);
        // Format used for writing
-       u8 version = SER_FMT_VER_HIGHEST;
+       u8 version = SER_FMT_VER_HIGHEST_WRITE;
        // Get destination
        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");
+       std::ostringstream ss(std::ios_base::binary);
+
+       sector->serialize(ss, version);
+
+       if(!fs::safeWriteToFile(fullpath, ss.str()))
+               throw FileNotGoodException("Cannot write sector metafile");
 
-       sector->serialize(o, version);
-       
        sector->differs_from_disk = false;
 }
 
@@ -3064,7 +3557,7 @@ MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load
                                        <<" Continuing with a sector with no metadata."
                                        <<std::endl;*/
                        sector = new ServerMapSector(this, p2d, m_gamedef);
-                       m_sectors.insert(p2d, sector);
+                       m_sectors[p2d] = sector;
                }
                else
                {
@@ -3078,7 +3571,7 @@ MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load
                if(save_after_load)
                        saveSectorMeta(sector);
        }
-       
+
        sector->differs_from_disk = false;
 
        return sector;
@@ -3123,7 +3616,7 @@ bool ServerMap::loadSectorMeta(v2s16 p2d)
        {
                return false;
        }
-       
+
        return true;
 }
 
@@ -3167,7 +3660,7 @@ bool ServerMap::loadSectorFull(v2s16 p2d)
        {
                return false;
        }
-       
+
        /*
                Load blocks
        */
@@ -3200,80 +3693,16 @@ bool ServerMap::loadSectorFull(v2s16 p2d)
 #endif
 
 void ServerMap::beginSave() {
-       verifyDatabase();
-       if(sqlite3_exec(m_database, "BEGIN;", NULL, NULL, NULL) != SQLITE_OK)
-               infostream<<"WARNING: beginSave() failed, saving might be slow.";
+       dbase->beginSave();
 }
 
 void ServerMap::endSave() {
-       verifyDatabase();
-       if(sqlite3_exec(m_database, "COMMIT;", NULL, NULL, NULL) != SQLITE_OK)
-               infostream<<"WARNING: endSave() failed, map might not have saved.";
+       dbase->endSave();
 }
 
 void ServerMap::saveBlock(MapBlock *block)
 {
-       DSTACK(__FUNCTION_NAME);
-       /*
-               Dummy blocks are not written
-       */
-       if(block->isDummy())
-       {
-               /*v3s16 p = block->getPos();
-               infostream<<"ServerMap::saveBlock(): WARNING: Not writing dummy block "
-                               <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
-               return;
-       }
-
-       // Format used for writing
-       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);
-
-       createDirs(sectordir);
-
-       std::string fullpath = sectordir+DIR_DELIM+getBlockFilename(p3d);
-       std::ofstream o(fullpath.c_str(), std::ios_base::binary);
-       if(o.good() == false)
-               throw FileNotGoodException("Cannot open block data");
-#endif
-       /*
-               [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, 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)
-               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
-               infostream<<"WARNING: Block data failed to bind: "<<sqlite3_errmsg(m_database)<<std::endl;
-       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;
-       // Make ready for later reuse
-       sqlite3_reset(m_database_write);
-       
-       // We just wrote it to the disk so clear modified flag
-       block->resetModified();
+  dbase->saveBlock(block);
 }
 
 void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSector *sector, bool save_after_load)
@@ -3286,12 +3715,12 @@ 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);
 
@@ -3314,26 +3743,26 @@ 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, true);
 
                // 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)
+               if(version < SER_FMT_VER_HIGHEST_WRITE || 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();
 
@@ -3345,7 +3774,7 @@ void ServerMap::loadBlock(std::string sectordir, std::string blockfile, MapSecto
                                <<" (SerializationError). "
                                <<"what()="<<e.what()
                                <<std::endl;
-                               //" Ignoring. A new one will be generated.
+                               // Ignoring. A new one will be generated.
                assert(0);
 
                // TODO: Backup file; name is in fullpath.
@@ -3358,7 +3787,7 @@ 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);
 
@@ -3381,37 +3810,43 @@ 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, true);
-               
+
                // 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)
+               //if(version < SER_FMT_VER_HIGHEST_READ || save_after_load)
                // Only save if asked to; no need to update version
                if(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);
+               errorstream<<"Invalid block data in database"
+                               <<" ("<<p3d.X<<","<<p3d.Y<<","<<p3d.Z<<")"
+                               <<" (SerializationError): "<<e.what()<<std::endl;
+
+               // TODO: Block should be marked as invalid in memory so that it is
+               // not touched but the game can run
 
-               // TODO: Copy to a backup database.
+               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);
+               }
        }
 }
 
@@ -3421,38 +3856,11 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 
        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);
+       MapBlock *ret;
 
-                       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
-       }
+       ret = dbase->loadBlock(blockpos);
+       if (ret) return (ret);
+       // Not found in database, try the files
 
        // The directory layout we're going to load from.
        //  1 - original sectors/xxxxzzzz/
@@ -3471,7 +3879,7 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
                loadlayout = 2;
                sectordir = getSectorDir(p2d, 2);
        }
-       
+
        /*
                Make sure sector is loaded
        */
@@ -3483,18 +3891,18 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
                }
                catch(InvalidFilenameException &e)
                {
-                       return false;
+                       return NULL;
                }
                catch(FileNotGoodException &e)
                {
-                       return false;
+                       return NULL;
                }
                catch(std::exception &e)
                {
-                       return false;
+                       return NULL;
                }
        }
-       
+
        /*
                Make sure file exists
        */
@@ -3515,744 +3923,48 @@ void ServerMap::PrintInfo(std::ostream &out)
        out<<"ServerMap: ";
 }
 
-#ifndef SERVER
-
-/*
-       ClientMap
-*/
-
-ClientMap::ClientMap(
-               Client *client,
-               IGameDef *gamedef,
-               MapDrawControl &control,
-               scene::ISceneNode* parent,
-               scene::ISceneManager* mgr,
-               s32 id
-):
-       Map(dout_client, gamedef),
-       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)
+s16 ServerMap::updateBlockHeat(ServerEnvironment *env, v3s16 p, MapBlock *block)
 {
-       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, m_gamedef);
+       u32 gametime = env->getGameTime();
        
-       {
-               //JMutexAutoLock lock(m_sector_mutex); // Bulk comment-out
-               m_sectors.insert(p2d, sector);
+       if (block) {
+               if (gametime - block->weather_update_time < 10)
+                       return block->heat;
+       } else {
+               block = getBlockNoCreateNoEx(getNodeBlockPos(p));
        }
-       
-       return sector;
-}
 
-#if 0
-void ClientMap::deSerializeSector(v2s16 p2d, std::istream &is)
-{
-       DSTACK(__FUNCTION_NAME);
-       ClientMapSector *sector = NULL;
+       f32 heat = m_emerge->biomedef->calcBlockHeat(p, m_seed,
+                       env->getTimeOfDayF(), gametime * env->getTimeOfDaySpeed());
 
-       //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);
-               }
+       if(block) {
+               block->heat = heat;
+               block->weather_update_time = gametime;
        }
-
-       sector->deSerialize(is);
+       return heat;
 }
-#endif
 
-void ClientMap::OnRegisterSceneNode()
+s16 ServerMap::updateBlockHumidity(ServerEnvironment *env, v3s16 p, MapBlock *block)
 {
-       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, INodeDefManager *nodemgr)
-{
-       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;
-               const ContentFeatures &f = nodemgr->get(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)
-{
-       INodeDefManager *nodemgr = m_gamedef->ndef();
-
-       //m_dout<<DTIME<<"Rendering map..."<<std::endl;
-       DSTACK(__FUNCTION_NAME);
-
-       bool is_transparent_pass = pass == scene::ESNRP_TRANSPARENT;
+       u32 gametime = env->getGameTime();
        
-       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();
+       if (block) {
+               if (gametime - block->weather_update_time < 10)
+                       return block->humidity;
+       } else {
+               block = getBlockNoCreateNoEx(getNodeBlockPos(p));
        }
 
-       /*
-               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
-               */
-
-               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
-                       */
+       f32 humidity = m_emerge->biomedef->calcBlockHumidity(p, m_seed,
+                       env->getTimeOfDayF(), gametime * env->getTimeOfDaySpeed());
                        
-                       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++;
-                       
-#if 1
-                       /*
-                               Update expired mesh (used for day/night change)
-
-                               It doesn't work exactly like it should now with the
-                               tasked mesh update but whatever.
-                       */
-
-                       bool mesh_expired = false;
-                       
-                       {
-                               JMutexAutoLock lock(block->mesh_mutex);
-
-                               mesh_expired = block->getMeshExpired();
-
-                               // 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;
-                               }
-                       }
-
-                       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++;
-
-                               // Mesh has been expired: generate new mesh
-                               //block->updateMesh(daynight_ratio);
-                               m_client->addUpdateMeshTask(block->getPos());
-
-                               mesh_expired = false;
-                       }
-#endif
-
-                       /*
-                               Occlusion culling
-                       */
-
-                       v3s16 cpn = block->getPos() * MAP_BLOCKSIZE;
-                       cpn += v3s16(MAP_BLOCKSIZE/2, MAP_BLOCKSIZE/2, 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, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,bs2,bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,bs2,-bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,-bs2,bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(bs2,-bs2,-bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,bs2,bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,bs2,-bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr) &&
-                               isOccluded(this, spn, cpn + v3s16(-bs2,-bs2,-bs2),
-                                       step, stepfac, startoff, endoff, needed_count, nodemgr)
-                       )
-                       {
-                               blocks_occlusion_culled++;
-                               continue;
-                       }
-                       
-                       // This block is in range. Reset usage timer.
-                       block->resetUsageTimer();
-
-                       /*
-                               Ignore if mesh doesn't exist
-                       */
-                       {
-                               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++;
-
-               } // foreach sectorblocks
-
-               if(sector_blocks_drawn != 0)
-                       m_last_drawn_sectors[sp] = true;
-       }
-       } // ScopeProfiler
-       
-       /*
-               Draw the selected MapBlocks
-       */
-
-       {
-       ScopeProfiler sp(g_profiler, prefix+"drawing blocks", SPT_AVG);
-
-       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;
-                               }
-                       }
-               }
-               
-               MapBlock *block = i.getNode()->getValue();
-
-               /*
-                       Draw the faces of the block
-               */
-               {
-                       JMutexAutoLock lock(block->mesh_mutex);
-
-                       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);
-       }
-       
-       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()
-{
-       INodeDefManager *nodemgr = m_gamedef->ndef();
-
-       // 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.
-       const ContentFeatures& features = nodemgr->get(n);
-       video::SColor post_effect_color = features.post_effect_color;
-       if(features.solidness == 2 && g_settings->getBool("free_move") == false)
-       {
-               post_effect_color = video::SColor(255, 0, 0, 0);
-       }
-       if (post_effect_color.getAlpha() != 0)
-       {
-               // 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);
-       }
-}
-
-bool ClientMap::setTempMod(v3s16 p, NodeMod mod,
-               core::map<v3s16, MapBlock*> *affected_blocks)
-{
-       bool changed = false;
-       /*
-               Add it to all blocks touching it
-       */
-       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)
-       {
-               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);
-               }
-       }
-       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))
-               {
-                       changed = true;
-               }
-       }
-       if(changed && affected_blocks!=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);
-               }
-       }
-       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++)
-               {
-                       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);
-                               }
-                       }
-               }
-       }
-}
-
-void ClientMap::updateMeshes(v3s16 blockpos, u32 daynight_ratio)
-{
-       assert(mapType() == MAPTYPE_CLIENT);
-
-       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){}
-}
-
-#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);
+       if(block) {
+               block->humidity = humidity;
+               block->weather_update_time = gametime;
        }
-}
-#endif
-
-void ClientMap::PrintInfo(std::ostream &out)
-{
-       out<<"ClientMap: ";
+       return humidity;
 }
 
-#endif // !SERVER
-
 /*
        MapVoxelManipulator
 */
@@ -4285,12 +3997,14 @@ 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
                {
@@ -4301,8 +4015,8 @@ 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
@@ -4315,6 +4029,8 @@ 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++)
@@ -4324,8 +4040,13 @@ 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;
@@ -4337,16 +4058,16 @@ 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
        */
@@ -4365,9 +4086,9 @@ void MapVoxelManipulator::blitBack
                        continue;
 
                MapNode &n = m_data[m_area.index(p)];
-                       
+
                v3s16 blockpos = getNodeBlockPos(p);
-               
+
                try
                {
                        // Get block
@@ -4376,7 +4097,7 @@ void MapVoxelManipulator::blitBack
                                blockpos_last = blockpos;
                                block_checked_in_modified = false;
                        }
-                       
+
                        // Calculate relative position in block
                        v3s16 relpos = p - blockpos * MAP_BLOCKSIZE;
 
@@ -4386,7 +4107,7 @@ void MapVoxelManipulator::blitBack
 
                        //m_map->setNode(m_area.MinEdge + p, n);
                        block->setNode(relpos, n);
-                       
+
                        /*
                                Make sure block is in modified_blocks
                        */
@@ -4418,8 +4139,8 @@ void ManualMapVoxelManipulator::emerge(VoxelArea a, s32 caller_id)
        VoxelManipulator::emerge(a, caller_id);
 }
 
-void ManualMapVoxelManipulator::initialEmerge(
-               v3s16 blockpos_min, v3s16 blockpos_max)
+void ManualMapVoxelManipulator::initialEmerge(v3s16 blockpos_min,
+                                               v3s16 blockpos_max, bool load_if_inexistent)
 {
        TimeTaker timer1("initialEmerge", &emerge_time);
 
@@ -4429,7 +4150,7 @@ 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)
        {
@@ -4445,18 +4166,20 @@ 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
@@ -4469,60 +4192,65 @@ void ManualMapVoxelManipulator::initialEmerge(
 
                if(block_data_inexistent)
                {
-                       /*
-                               Mark area inexistent
-                       */
-                       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++)
-                       for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
-                       {
-                               s32 i = m_area.index(a.MinEdge.X,y,z);
-                               memset(&m_flags[i], VOXELFLAG_INEXISTENT, MAP_BLOCKSIZE);
+                       
+                       if (load_if_inexistent) {
+                               ServerMap *svrmap = (ServerMap *)m_map;
+                               block = svrmap->emergeBlock(p, false);
+                               if (block == NULL)
+                                       block = svrmap->createBlock(p);
+                               else
+                                       block->copyTo(*this);
+                       } else {
+                               flags |= VMANIP_BLOCK_DATA_INEXIST;
+                               
+                               /*
+                                       Mark area inexistent
+                               */
+                               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++)
+                               for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
+                               {
+                                       s32 i = m_area.index(a.MinEdge.X,y,z);
+                                       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;
        }
 }