src/mapgen_v7.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2010-2015 paramat, Matt Gregory
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21
  22 #include "mapgen.h"
  23 #include "voxel.h"
  24 #include "noise.h"
  25 #include "mapblock.h"
  26 #include "mapnode.h"
  27 #include "map.h"
  28 #include "content_sao.h"
  29 #include "nodedef.h"
  30 #include "voxelalgorithms.h"
  31 //#include "profiler.h" // For TimeTaker
  32 #include "settings.h" // For g_settings
  33 #include "emerge.h"
  34 #include "dungeongen.h"
  35 #include "cavegen.h"
  36 #include "treegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_v7.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_v7[] = {
  44         {"mountains", MGV7_MOUNTAINS},
  45         {"ridges",    MGV7_RIDGES},
  46         {NULL,        0}
  47 };
  48
  49
  50 ///////////////////////////////////////////////////////////////////////////////
  51
  52
  53 MapgenV7::MapgenV7(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  54         : MapgenBasic(mapgenid, params, emerge)
  55 {
  56         MapgenV7Params *sp = (MapgenV7Params *)params->sparams;
  57
  58         this->spflags    = sp->spflags;
  59         this->cave_width = sp->cave_width;
  60
  61         //// Terrain noise
  62         noise_terrain_base    = new Noise(&sp->np_terrain_base,    seed, csize.X, csize.Z);
  63         noise_terrain_alt     = new Noise(&sp->np_terrain_alt,     seed, csize.X, csize.Z);
  64         noise_terrain_persist = new Noise(&sp->np_terrain_persist, seed, csize.X, csize.Z);
  65         noise_height_select   = new Noise(&sp->np_height_select,   seed, csize.X, csize.Z);
  66         noise_filler_depth    = new Noise(&sp->np_filler_depth,    seed, csize.X, csize.Z);
  67         noise_mount_height    = new Noise(&sp->np_mount_height,    seed, csize.X, csize.Z);
  68         noise_ridge_uwater    = new Noise(&sp->np_ridge_uwater,    seed, csize.X, csize.Z);
  69
  70         //// 3d terrain noise
  71         // 1-up 1-down overgeneration
  72         noise_mountain = new Noise(&sp->np_mountain, seed, csize.X, csize.Y + 2, csize.Z);
  73         noise_ridge    = new Noise(&sp->np_ridge,    seed, csize.X, csize.Y + 2, csize.Z);
  74
  75         MapgenBasic::np_cave1 = sp->np_cave1;
  76         MapgenBasic::np_cave2 = sp->np_cave2;
  77 }
  78
  79
  80 MapgenV7::~MapgenV7()
  81 {
  82         delete noise_terrain_base;
  83         delete noise_terrain_persist;
  84         delete noise_height_select;
  85         delete noise_terrain_alt;
  86         delete noise_filler_depth;
  87         delete noise_mount_height;
  88         delete noise_ridge_uwater;
  89         delete noise_mountain;
  90         delete noise_ridge;
  91 }
  92
  93
  94 MapgenV7Params::MapgenV7Params()
  95 {
  96         spflags    = MGV7_MOUNTAINS | MGV7_RIDGES;
  97         cave_width = 0.3;
  98
  99         np_terrain_base    = NoiseParams(4,    70,  v3f(600,  600,  600),  82341, 5, 0.6,  2.0);
 100         np_terrain_alt     = NoiseParams(4,    25,  v3f(600,  600,  600),  5934,  5, 0.6,  2.0);
 101         np_terrain_persist = NoiseParams(0.6,  0.1, v3f(2000, 2000, 2000), 539,   3, 0.6,  2.0);
 102         np_height_select   = NoiseParams(-8,   16,  v3f(500,  500,  500),  4213,  6, 0.7,  2.0);
 103         np_filler_depth    = NoiseParams(0,    1.2, v3f(150,  150,  150),  261,   3, 0.7,  2.0);
 104         np_mount_height    = NoiseParams(256,  112, v3f(1000, 1000, 1000), 72449, 3, 0.6,  2.0);
 105         np_ridge_uwater    = NoiseParams(0,    1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0);
 106         np_mountain        = NoiseParams(-0.6, 1,   v3f(250,  350,  250),  5333,  5, 0.63, 2.0);
 107         np_ridge           = NoiseParams(0,    1,   v3f(100,  100,  100),  6467,  4, 0.75, 2.0);
 108         np_cave1           = NoiseParams(0,    12,  v3f(96,   96,   96),   52534, 4, 0.5,  2.0);
 109         np_cave2           = NoiseParams(0,    12,  v3f(96,   96,   96),   10325, 4, 0.5,  2.0);
 110 }
 111
 112
 113 void MapgenV7Params::readParams(const Settings *settings)
 114 {
 115         settings->getFlagStrNoEx("mgv7_spflags",  spflags, flagdesc_mapgen_v7);
 116         settings->getFloatNoEx("mgv7_cave_width", cave_width);
 117
 118         settings->getNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 119         settings->getNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 120         settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 121         settings->getNoiseParams("mgv7_np_height_select",   np_height_select);
 122         settings->getNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 123         settings->getNoiseParams("mgv7_np_mount_height",    np_mount_height);
 124         settings->getNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 125         settings->getNoiseParams("mgv7_np_mountain",        np_mountain);
 126         settings->getNoiseParams("mgv7_np_ridge",           np_ridge);
 127         settings->getNoiseParams("mgv7_np_cave1",           np_cave1);
 128         settings->getNoiseParams("mgv7_np_cave2",           np_cave2);
 129 }
 130
 131
 132 void MapgenV7Params::writeParams(Settings *settings) const
 133 {
 134         settings->setFlagStr("mgv7_spflags",  spflags, flagdesc_mapgen_v7, U32_MAX);
 135         settings->setFloat("mgv7_cave_width", cave_width);
 136
 137         settings->setNoiseParams("mgv7_np_terrain_base",    np_terrain_base);
 138         settings->setNoiseParams("mgv7_np_terrain_alt",     np_terrain_alt);
 139         settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
 140         settings->setNoiseParams("mgv7_np_height_select",   np_height_select);
 141         settings->setNoiseParams("mgv7_np_filler_depth",    np_filler_depth);
 142         settings->setNoiseParams("mgv7_np_mount_height",    np_mount_height);
 143         settings->setNoiseParams("mgv7_np_ridge_uwater",    np_ridge_uwater);
 144         settings->setNoiseParams("mgv7_np_mountain",        np_mountain);
 145         settings->setNoiseParams("mgv7_np_ridge",           np_ridge);
 146         settings->setNoiseParams("mgv7_np_cave1",           np_cave1);
 147         settings->setNoiseParams("mgv7_np_cave2",           np_cave2);
 148 }
 149
 150
 151 ///////////////////////////////////////////////////////////////////////////////
 152
 153
 154 int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 155 {
 156         // Base terrain calculation
 157         s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
 158
 159         // Ridge/river terrain calculation
 160         float width = 0.2;
 161         float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 162         // if inside a river this is an unsuitable spawn point
 163         if (fabs(uwatern) <= width)
 164                 return MAX_MAP_GENERATION_LIMIT;
 165
 166         // Mountain terrain calculation
 167         int iters = 128;
 168         while (iters--) {
 169                 if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {  // Air, y is ground level
 170                         if (y <= water_level || y > water_level + 16)
 171                                 return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 172                         else
 173                                 return y;
 174                 }
 175                 y++;
 176         }
 177
 178         // Unsuitable spawn point, no ground surface found
 179         return MAX_MAP_GENERATION_LIMIT;
 180 }
 181
 182
 183 void MapgenV7::makeChunk(BlockMakeData *data)
 184 {
 185         // Pre-conditions
 186         assert(data->vmanip);
 187         assert(data->nodedef);
 188         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 189                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 190                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 191         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 192                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 193                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 194
 195         this->generating = true;
 196         this->vm   = data->vmanip;
 197         this->ndef = data->nodedef;
 198         //TimeTaker t("makeChunk");
 199
 200         v3s16 blockpos_min = data->blockpos_min;
 201         v3s16 blockpos_max = data->blockpos_max;
 202         node_min = blockpos_min * MAP_BLOCKSIZE;
 203         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 204         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 205         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 206
 207         blockseed = getBlockSeed2(full_node_min, seed);
 208
 209         // Generate terrain and ridges with initial heightmaps
 210         s16 stone_surface_max_y = generateTerrain();
 211
 212         if (spflags & MGV7_RIDGES)
 213                 generateRidgeTerrain();
 214
 215         // Update heightmap to include mountain terrain
 216         updateHeightmap(node_min, node_max);
 217
 218         // Init biome generator, place biome-specific nodes, and build biomemap
 219         biomegen->calcBiomeNoise(node_min);
 220         biomegen->getBiomes(heightmap);
 221         MgStoneType stone_type = generateBiomes();
 222
 223         if (flags & MG_CAVES)
 224                 generateCaves(stone_surface_max_y, water_level);
 225
 226         if (flags & MG_DUNGEONS)
 227                 generateDungeons(stone_surface_max_y, stone_type);
 228
 229         // Generate the registered decorations
 230         if (flags & MG_DECORATIONS)
 231                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 232
 233         // Generate the registered ores
 234         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 235
 236         // Sprinkle some dust on top after everything else was generated
 237         dustTopNodes();
 238
 239         //printf("makeChunk: %dms\n", t.stop());
 240
 241         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 242
 243         if (flags & MG_LIGHT)
 244                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 245                         full_node_min, full_node_max);
 246
 247         //setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
 248         //                      node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
 249
 250         this->generating = false;
 251 }
 252
 253
 254 float MapgenV7::baseTerrainLevelAtPoint(s16 x, s16 z)
 255 {
 256         float hselect = NoisePerlin2D(&noise_height_select->np, x, z, seed);
 257         hselect = rangelim(hselect, 0.0, 1.0);
 258
 259         float persist = NoisePerlin2D(&noise_terrain_persist->np, x, z, seed);
 260
 261         noise_terrain_base->np.persist = persist;
 262         float height_base = NoisePerlin2D(&noise_terrain_base->np, x, z, seed);
 263
 264         noise_terrain_alt->np.persist = persist;
 265         float height_alt = NoisePerlin2D(&noise_terrain_alt->np, x, z, seed);
 266
 267         if (height_alt > height_base)
 268                 return height_alt;
 269
 270         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 271 }
 272
 273
 274 float MapgenV7::baseTerrainLevelFromMap(int index)
 275 {
 276         float hselect     = rangelim(noise_height_select->result[index], 0.0, 1.0);
 277         float height_base = noise_terrain_base->result[index];
 278         float height_alt  = noise_terrain_alt->result[index];
 279
 280         if (height_alt > height_base)
 281                 return height_alt;
 282
 283         return (height_base * hselect) + (height_alt * (1.0 - hselect));
 284 }
 285
 286
 287 bool MapgenV7::getMountainTerrainAtPoint(s16 x, s16 y, s16 z)
 288 {
 289         float mnt_h_n = NoisePerlin2D(&noise_mount_height->np, x, z, seed);
 290         float density_gradient = -((float)y / mnt_h_n);
 291         float mnt_n = NoisePerlin3D(&noise_mountain->np, x, y, z, seed);
 292
 293         return mnt_n + density_gradient >= 0.0;
 294 }
 295
 296
 297 bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
 298 {
 299         float mounthn = noise_mount_height->result[idx_xz];
 300         float density_gradient = -((float)y / mounthn);
 301         float mountn = noise_mountain->result[idx_xyz];
 302
 303         return mountn + density_gradient >= 0.0;
 304 }
 305
 306
 307 int MapgenV7::generateTerrain()
 308 {
 309         MapNode n_air(CONTENT_AIR);
 310         MapNode n_stone(c_stone);
 311         MapNode n_water(c_water_source);
 312
 313         //// Calculate noise for terrain generation
 314         noise_terrain_persist->perlinMap2D(node_min.X, node_min.Z);
 315         float *persistmap = noise_terrain_persist->result;
 316
 317         noise_terrain_base->perlinMap2D(node_min.X, node_min.Z, persistmap);
 318         noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
 319         noise_height_select->perlinMap2D(node_min.X, node_min.Z);
 320
 321         if (spflags & MGV7_MOUNTAINS) {
 322                 noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 323                 noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
 324         }
 325
 326         //// Place nodes
 327         v3s16 em = vm->m_area.getExtent();
 328         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 329         u32 index2d = 0;
 330
 331         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 332         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 333                 s16 surface_y = baseTerrainLevelFromMap(index2d);
 334                 heightmap[index2d] = surface_y;  // Create base terrain heightmap
 335
 336                 if (surface_y > stone_surface_max_y)
 337                         stone_surface_max_y = surface_y;
 338
 339                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 340                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 341
 342                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 343                         if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
 344                                 if (y <= surface_y) {
 345                                         vm->m_data[vi] = n_stone;  // Base terrain
 346                                 } else if ((spflags & MGV7_MOUNTAINS) &&
 347                                                 getMountainTerrainFromMap(index3d, index2d, y)) {
 348                                         vm->m_data[vi] = n_stone;  // Mountain terrain
 349                                         if (y > stone_surface_max_y)
 350                                                 stone_surface_max_y = y;
 351                                 } else if (y <= water_level) {
 352                                         vm->m_data[vi] = n_water;
 353                                 } else {
 354                                         vm->m_data[vi] = n_air;
 355                                 }
 356                         }
 357                         vm->m_area.add_y(em, vi, 1);
 358                         index3d += ystride;
 359                 }
 360         }
 361
 362         return stone_surface_max_y;
 363 }
 364
 365
 366 void MapgenV7::generateRidgeTerrain()
 367 {
 368         if (node_max.Y < water_level - 16)
 369                 return;
 370
 371         noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 372         noise_ridge_uwater->perlinMap2D(node_min.X, node_min.Z);
 373
 374         MapNode n_water(c_water_source);
 375         MapNode n_air(CONTENT_AIR);
 376         u32 index = 0;
 377         float width = 0.2;
 378
 379         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 380         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 381                 u32 vi = vm->m_area.index(node_min.X, y, z);
 382                 for (s16 x = node_min.X; x <= node_max.X; x++, index++, vi++) {
 383                         int j = (z - node_min.Z) * csize.X + (x - node_min.X);
 384
 385                         if (heightmap[j] < water_level - 16)  // Use base terrain heightmap
 386                                 continue;
 387
 388                         float uwatern = noise_ridge_uwater->result[j] * 2;
 389                         if (fabs(uwatern) > width)
 390                                 continue;
 391
 392                         float altitude = y - water_level;
 393                         float height_mod = (altitude + 17) / 2.5;
 394                         float width_mod  = width - fabs(uwatern);
 395                         float nridge = noise_ridge->result[index] * MYMAX(altitude, 0) / 7.0;
 396
 397                         if (nridge + width_mod * height_mod < 0.6)
 398                                 continue;
 399
 400                         vm->m_data[vi] = (y > water_level) ? n_air : n_water;
 401                 }
 402         }
 403 }
 404
 405
 406 ////////////////////////////////////////////////////////////////////////////////
 407 //// Code Boneyard
 408 ////
 409 //// Much of the stuff here has potential to become useful again at some point
 410 //// in the future, but we don't want it to get lost or forgotten in version
 411 //// control.
 412 ////
 413
 414 #if 0
 415 int MapgenV7::generateMountainTerrain(s16 ymax)
 416 {
 417         MapNode n_stone(c_stone);
 418         u32 j = 0;
 419
 420         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 421         for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 422                 u32 vi = vm->m_area.index(node_min.X, y, z);
 423                 for (s16 x = node_min.X; x <= node_max.X; x++) {
 424                         int index = (z - node_min.Z) * csize.X + (x - node_min.X);
 425                         content_t c = vm->m_data[vi].getContent();
 426
 427                         if (getMountainTerrainFromMap(j, index, y)
 428                                         && (c == CONTENT_AIR || c == c_water_source)) {
 429                                 vm->m_data[vi] = n_stone;
 430                                 if (y > ymax)
 431                                         ymax = y;
 432                         }
 433
 434                         vi++;
 435                         j++;
 436                 }
 437         }
 438
 439         return ymax;
 440 }
 441 #endif
 442
 443
 444 #if 0
 445 void MapgenV7::carveRivers() {
 446         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 447         MapNode n_stone(c_stone);
 448         u32 index = 0;
 449
 450         int river_depth = 4;
 451
 452         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 453         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 454                 float terrain_mod  = noise_terrain_mod->result[index];
 455                 NoiseParams *np = noise_terrain_river->np;
 456                 np.persist = noise_terrain_persist->result[index];
 457                 float terrain_river = NoisePerlin2DNoTxfm(np, x, z, seed);
 458                 float height = terrain_river * (1 - abs(terrain_mod)) *
 459                                                 noise_terrain_river->np.scale;
 460                 height = log(height * height); //log(h^3) is pretty interesting for terrain
 461
 462                 s16 y = heightmap[index];
 463                 if (height < 1.0 && y > river_depth &&
 464                         y - river_depth >= node_min.Y && y <= node_max.Y) {
 465
 466                         for (s16 ry = y; ry != y - river_depth; ry--) {
 467                                 u32 vi = vm->m_area.index(x, ry, z);
 468                                 vm->m_data[vi] = n_air;
 469                         }
 470
 471                         u32 vi = vm->m_area.index(x, y - river_depth, z);
 472                         vm->m_data[vi] = n_water_source;
 473                 }
 474         }
 475 }
 476 #endif
 477
 478
 479 #if 0
 480 void MapgenV7::addTopNodes()
 481 {
 482         v3s16 em = vm->m_area.getExtent();
 483         s16 ntopnodes;
 484         u32 index = 0;
 485
 486         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 487         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 488                 Biome *biome = bmgr->biomes[biomemap[index]];
 489
 490                 //////////////////// First, add top nodes below the ridge
 491                 s16 y = ridge_heightmap[index];
 492
 493                 // This cutoff is good enough, but not perfect.
 494                 // It will cut off potentially placed top nodes at chunk boundaries
 495                 if (y < node_min.Y)
 496                         continue;
 497                 if (y > node_max.Y) {
 498                         y = node_max.Y; // Let's see if we can still go downward anyway
 499                         u32 vi = vm->m_area.index(x, y, z);
 500                         content_t c = vm->m_data[vi].getContent();
 501                         if (ndef->get(c).walkable)
 502                                 continue;
 503                 }
 504
 505                 // N.B.  It is necessary to search downward since ridge_heightmap[i]
 506                 // might not be the actual height, just the lowest part in the chunk
 507                 // where a ridge had been carved
 508                 u32 i = vm->m_area.index(x, y, z);
 509                 for (; y >= node_min.Y; y--) {
 510                         content_t c = vm->m_data[i].getContent();
 511                         if (ndef->get(c).walkable)
 512                                 break;
 513                         vm->m_area.add_y(em, i, -1);
 514                 }
 515
 516                 if (y != node_min.Y - 1 && y >= water_level) {
 517                         ridge_heightmap[index] = y; //update ridgeheight
 518                         ntopnodes = biome->top_depth;
 519                         for (; y <= node_max.Y && ntopnodes; y++) {
 520                                 ntopnodes--;
 521                                 vm->m_data[i] = MapNode(biome->c_top);
 522                                 vm->m_area.add_y(em, i, 1);
 523                         }
 524                         // If dirt, grow grass on it.
 525                         if (y > water_level - 10 &&
 526                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 527                                 vm->m_area.add_y(em, i, -1);
 528                                 if (vm->m_data[i].getContent() == c_dirt)
 529                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 530                         }
 531                 }
 532
 533                 //////////////////// Now, add top nodes on top of the ridge
 534                 y = heightmap[index];
 535                 if (y > node_max.Y) {
 536                         y = node_max.Y; // Let's see if we can still go downward anyway
 537                         u32 vi = vm->m_area.index(x, y, z);
 538                         content_t c = vm->m_data[vi].getContent();
 539                         if (ndef->get(c).walkable)
 540                                 continue;
 541                 }
 542
 543                 i = vm->m_area.index(x, y, z);
 544                 for (; y >= node_min.Y; y--) {
 545                         content_t c = vm->m_data[i].getContent();
 546                         if (ndef->get(c).walkable)
 547                                 break;
 548                         vm->m_area.add_y(em, i, -1);
 549                 }
 550
 551                 if (y != node_min.Y - 1) {
 552                         ntopnodes = biome->top_depth;
 553                         // Let's see if we've already added it...
 554                         if (y == ridge_heightmap[index] + ntopnodes - 1)
 555                                 continue;
 556
 557                         for (; y <= node_max.Y && ntopnodes; y++) {
 558                                 ntopnodes--;
 559                                 vm->m_data[i] = MapNode(biome->c_top);
 560                                 vm->m_area.add_y(em, i, 1);
 561                         }
 562                         // If dirt, grow grass on it.
 563                         if (y > water_level - 10 &&
 564                                 vm->m_data[i].getContent() == CONTENT_AIR) {
 565                                 vm->m_area.add_y(em, i, -1);
 566                                 if (vm->m_data[i].getContent() == c_dirt)
 567                                         vm->m_data[i] = MapNode(c_dirt_with_grass);
 568                         }
 569                 }
 570         }
 571 }
 572 #endif