src/mapgen_v5.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_v5.h"
  41 #include "util/directiontables.h"
  42
  43
  44 FlagDesc flagdesc_mapgen_v5[] = {
  45         {NULL,         0}
  46 };
  47
  48
  49 MapgenV5::MapgenV5(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  50         : Mapgen(mapgenid, params, emerge)
  51 {
  52         this->m_emerge = emerge;
  53         this->bmgr     = emerge->biomemgr;
  54
  55         // amount of elements to skip for the next index
  56         // for noise/height/biome maps (not vmanip)
  57         this->ystride = csize.X;
  58         this->zstride = csize.X * (csize.Y + 2);
  59
  60         this->biomemap  = new u8[csize.X * csize.Z];
  61         this->heightmap = new s16[csize.X * csize.Z];
  62         this->heatmap   = NULL;
  63         this->humidmap  = NULL;
  64
  65         MapgenV5Params *sp = (MapgenV5Params *)params->sparams;
  66         this->spflags      = sp->spflags;
  67
  68         // Terrain noise
  69         noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
  70         noise_factor       = new Noise(&sp->np_factor,       seed, csize.X, csize.Z);
  71         noise_height       = new Noise(&sp->np_height,       seed, csize.X, csize.Z);
  72
  73         // 3D terrain noise
  74         noise_cave1  = new Noise(&sp->np_cave1,  seed, csize.X, csize.Y + 2, csize.Z);
  75         noise_cave2  = new Noise(&sp->np_cave2,  seed, csize.X, csize.Y + 2, csize.Z);
  76         noise_ground = new Noise(&sp->np_ground, seed, csize.X, csize.Y + 2, csize.Z);
  77
  78         // Biome noise
  79         noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
  80         noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
  81         noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
  82         noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
  83
  84         //// Resolve nodes to be used
  85         INodeDefManager *ndef = emerge->ndef;
  86
  87         c_stone                = ndef->getId("mapgen_stone");
  88         c_water_source         = ndef->getId("mapgen_water_source");
  89         c_lava_source          = ndef->getId("mapgen_lava_source");
  90         c_desert_stone         = ndef->getId("mapgen_desert_stone");
  91         c_ice                  = ndef->getId("mapgen_ice");
  92         c_sandstone            = ndef->getId("mapgen_sandstone");
  93
  94         c_cobble               = ndef->getId("mapgen_cobble");
  95         c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
  96         c_mossycobble          = ndef->getId("mapgen_mossycobble");
  97         c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
  98         c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");
  99
 100         if (c_ice == CONTENT_IGNORE)
 101                 c_ice = CONTENT_AIR;
 102         if (c_mossycobble == CONTENT_IGNORE)
 103                 c_mossycobble = c_cobble;
 104         if (c_stair_cobble == CONTENT_IGNORE)
 105                 c_stair_cobble = c_cobble;
 106         if (c_sandstonebrick == CONTENT_IGNORE)
 107                 c_sandstonebrick = c_sandstone;
 108         if (c_stair_sandstonebrick == CONTENT_IGNORE)
 109                 c_stair_sandstonebrick = c_sandstone;
 110 }
 111
 112
 113 MapgenV5::~MapgenV5()
 114 {
 115         delete noise_filler_depth;
 116         delete noise_factor;
 117         delete noise_height;
 118         delete noise_cave1;
 119         delete noise_cave2;
 120         delete noise_ground;
 121
 122         delete noise_heat;
 123         delete noise_humidity;
 124         delete noise_heat_blend;
 125         delete noise_humidity_blend;
 126
 127         delete[] heightmap;
 128         delete[] biomemap;
 129 }
 130
 131
 132 MapgenV5Params::MapgenV5Params()
 133 {
 134         spflags = 0;
 135
 136         np_filler_depth = NoiseParams(0, 1,  v3f(150, 150, 150), 261,    4, 0.7,  2.0);
 137         np_factor       = NoiseParams(0, 1,  v3f(250, 250, 250), 920381, 3, 0.45, 2.0);
 138         np_height       = NoiseParams(0, 10, v3f(250, 250, 250), 84174,  4, 0.5,  2.0);
 139         np_cave1        = NoiseParams(0, 12, v3f(50,  50,  50),  52534,  4, 0.5,  2.0);
 140         np_cave2        = NoiseParams(0, 12, v3f(50,  50,  50),  10325,  4, 0.5,  2.0);
 141         np_ground       = NoiseParams(0, 40, v3f(80,  80,  80),  983240, 4, 0.55, 2.0, NOISE_FLAG_EASED);
 142 }
 143
 144
 145 //#define CAVE_NOISE_SCALE 12.0
 146 //#define CAVE_NOISE_THRESHOLD (1.5/CAVE_NOISE_SCALE) = 0.125
 147
 148
 149 void MapgenV5Params::readParams(const Settings *settings)
 150 {
 151         settings->getFlagStrNoEx("mgv5_spflags", spflags, flagdesc_mapgen_v5);
 152
 153         settings->getNoiseParams("mgv5_np_filler_depth", np_filler_depth);
 154         settings->getNoiseParams("mgv5_np_factor",       np_factor);
 155         settings->getNoiseParams("mgv5_np_height",       np_height);
 156         settings->getNoiseParams("mgv5_np_cave1",        np_cave1);
 157         settings->getNoiseParams("mgv5_np_cave2",        np_cave2);
 158         settings->getNoiseParams("mgv5_np_ground",       np_ground);
 159 }
 160
 161
 162 void MapgenV5Params::writeParams(Settings *settings) const
 163 {
 164         settings->setFlagStr("mgv5_spflags", spflags, flagdesc_mapgen_v5, U32_MAX);
 165
 166         settings->setNoiseParams("mgv5_np_filler_depth", np_filler_depth);
 167         settings->setNoiseParams("mgv5_np_factor",       np_factor);
 168         settings->setNoiseParams("mgv5_np_height",       np_height);
 169         settings->setNoiseParams("mgv5_np_cave1",        np_cave1);
 170         settings->setNoiseParams("mgv5_np_cave2",        np_cave2);
 171         settings->setNoiseParams("mgv5_np_ground",       np_ground);
 172 }
 173
 174
 175 int MapgenV5::getGroundLevelAtPoint(v2s16 p)
 176 {
 177         //TimeTaker t("getGroundLevelAtPoint", NULL, PRECISION_MICRO);
 178
 179         float f = 0.55 + NoisePerlin2D(&noise_factor->np, p.X, p.Y, seed);
 180         if (f < 0.01)
 181                 f = 0.01;
 182         else if (f >= 1.0)
 183                 f *= 1.6;
 184         float h = NoisePerlin2D(&noise_height->np, p.X, p.Y, seed);
 185
 186         s16 search_start = 128; // Only bother searching this range, actual
 187         s16 search_end = -128;  // ground level is rarely higher or lower.
 188
 189         for (s16 y = search_start; y >= search_end; y--) {
 190                 float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);
 191                 // If solid
 192                 if (n_ground * f > y - h) {
 193                         // If either top 2 nodes of search are solid this is inside a
 194                         // mountain or floatland with no space for the player to spawn.
 195                         if (y >= search_start - 1)
 196                                 return MAX_MAP_GENERATION_LIMIT;
 197                         else
 198                                 return y; // Ground below at least 2 nodes of space
 199                 }
 200         }
 201
 202         //printf("getGroundLevelAtPoint: %dus\n", t.stop());
 203         return -MAX_MAP_GENERATION_LIMIT;
 204 }
 205
 206
 207 void MapgenV5::makeChunk(BlockMakeData *data)
 208 {
 209         // Pre-conditions
 210         assert(data->vmanip);
 211         assert(data->nodedef);
 212         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 213                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 214                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 215         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 216                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 217                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 218
 219         generating = true;
 220         vm   = data->vmanip;
 221         ndef = data->nodedef;
 222         //TimeTaker t("makeChunk");
 223
 224         v3s16 blockpos_min = data->blockpos_min;
 225         v3s16 blockpos_max = data->blockpos_max;
 226         node_min = blockpos_min * MAP_BLOCKSIZE;
 227         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 228         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 229         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 230
 231         // Create a block-specific seed
 232         blockseed = getBlockSeed2(full_node_min, seed);
 233
 234         // Make some noise
 235         calculateNoise();
 236
 237         // Generate base terrain
 238         s16 stone_surface_max_y = generateBaseTerrain();
 239
 240         // Create heightmap
 241         updateHeightmap(node_min, node_max);
 242
 243         // Create biomemap at heightmap surface
 244         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 245                 noise_humidity->result, heightmap, biomemap);
 246
 247         // Actually place the biome-specific nodes
 248         MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
 249
 250         // Generate caves
 251         if ((flags & MG_CAVES) && (stone_surface_max_y >= node_min.Y))
 252                 generateCaves(stone_surface_max_y);
 253
 254         // Generate dungeons and desert temples
 255         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 256                 DungeonParams dp;
 257
 258                 dp.np_rarity  = nparams_dungeon_rarity;
 259                 dp.np_density = nparams_dungeon_density;
 260                 dp.np_wetness = nparams_dungeon_wetness;
 261                 dp.c_water    = c_water_source;
 262                 if (stone_type == STONE) {
 263                         dp.c_cobble = c_cobble;
 264                         dp.c_moss   = c_mossycobble;
 265                         dp.c_stair  = c_stair_cobble;
 266
 267                         dp.diagonal_dirs = false;
 268                         dp.mossratio     = 3.0;
 269                         dp.holesize      = v3s16(1, 2, 1);
 270                         dp.roomsize      = v3s16(0, 0, 0);
 271                         dp.notifytype    = GENNOTIFY_DUNGEON;
 272                 } else if (stone_type == DESERT_STONE) {
 273                         dp.c_cobble = c_desert_stone;
 274                         dp.c_moss   = c_desert_stone;
 275                         dp.c_stair  = c_desert_stone;
 276
 277                         dp.diagonal_dirs = true;
 278                         dp.mossratio     = 0.0;
 279                         dp.holesize      = v3s16(2, 3, 2);
 280                         dp.roomsize      = v3s16(2, 5, 2);
 281                         dp.notifytype    = GENNOTIFY_TEMPLE;
 282                 } else if (stone_type == SANDSTONE) {
 283                         dp.c_cobble = c_sandstonebrick;
 284                         dp.c_moss   = c_sandstonebrick;
 285                         dp.c_stair  = c_sandstonebrick;
 286
 287                         dp.diagonal_dirs = false;
 288                         dp.mossratio     = 0.0;
 289                         dp.holesize      = v3s16(2, 2, 2);
 290                         dp.roomsize      = v3s16(2, 0, 2);
 291                         dp.notifytype    = GENNOTIFY_DUNGEON;
 292                 }
 293
 294                 DungeonGen dgen(this, &dp);
 295                 dgen.generate(blockseed, full_node_min, full_node_max);
 296         }
 297
 298         // Generate the registered decorations
 299         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 300
 301         // Generate the registered ores
 302         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 303
 304         // Sprinkle some dust on top after everything else was generated
 305         dustTopNodes();
 306
 307         //printf("makeChunk: %dms\n", t.stop());
 308
 309         // Add top and bottom side of water to transforming_liquid queue
 310         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 311
 312         // Calculate lighting
 313         if (flags & MG_LIGHT) {
 314                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 315                         full_node_min, full_node_max);
 316         }
 317
 318         this->generating = false;
 319 }
 320
 321
 322 void MapgenV5::calculateNoise()
 323 {
 324         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 325         int x = node_min.X;
 326         int y = node_min.Y - 1;
 327         int z = node_min.Z;
 328
 329         noise_factor->perlinMap2D(x, z);
 330         noise_height->perlinMap2D(x, z);
 331         noise_ground->perlinMap3D(x, y, z);
 332
 333         if (flags & MG_CAVES) {
 334                 noise_cave1->perlinMap3D(x, y, z);
 335                 noise_cave2->perlinMap3D(x, y, z);
 336         }
 337
 338         noise_filler_depth->perlinMap2D(x, z);
 339         noise_heat->perlinMap2D(x, z);
 340         noise_humidity->perlinMap2D(x, z);
 341         noise_heat_blend->perlinMap2D(x, z);
 342         noise_humidity_blend->perlinMap2D(x, z);
 343
 344         for (s32 i = 0; i < csize.X * csize.Z; i++) {
 345                 noise_heat->result[i] += noise_heat_blend->result[i];
 346                 noise_humidity->result[i] += noise_humidity_blend->result[i];
 347         }
 348
 349         heatmap = noise_heat->result;
 350         humidmap = noise_humidity->result;
 351         //printf("calculateNoise: %dus\n", t.stop());
 352 }
 353
 354
 355 //bool is_cave(u32 index) {
 356 //      double d1 = contour(noise_cave1->result[index]);
 357 //      double d2 = contour(noise_cave2->result[index]);
 358 //      return d1*d2 > CAVE_NOISE_THRESHOLD;
 359 //}
 360
 361 //bool val_is_ground(v3s16 p, u32 index, u32 index2d) {
 362 //      double f = 0.55 + noise_factor->result[index2d];
 363 //      if(f < 0.01)
 364 //              f = 0.01;
 365 //      else if(f >= 1.0)
 366 //              f *= 1.6;
 367 //      double h = WATER_LEVEL + 10 * noise_height->result[index2d];
 368 //      return (noise_ground->result[index] * f > (double)p.Y - h);
 369 //}
 370
 371
 372 int MapgenV5::generateBaseTerrain()
 373 {
 374         u32 index = 0;
 375         u32 index2d = 0;
 376         int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 377
 378         for (s16 z=node_min.Z; z<=node_max.Z; z++) {
 379                 for (s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
 380                         u32 i = vm->m_area.index(node_min.X, y, z);
 381                         for (s16 x=node_min.X; x<=node_max.X; x++, i++, index++, index2d++) {
 382                                 if (vm->m_data[i].getContent() != CONTENT_IGNORE)
 383                                         continue;
 384
 385                                 float f = 0.55 + noise_factor->result[index2d];
 386                                 if (f < 0.01)
 387                                         f = 0.01;
 388                                 else if (f >= 1.0)
 389                                         f *= 1.6;
 390                                 float h = noise_height->result[index2d];
 391
 392                                 if (noise_ground->result[index] * f < y - h) {
 393                                         if (y <= water_level)
 394                                                 vm->m_data[i] = MapNode(c_water_source);
 395                                         else
 396                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 397                                 } else {
 398                                         vm->m_data[i] = MapNode(c_stone);
 399                                         if (y > stone_surface_max_y)
 400                                                 stone_surface_max_y = y;
 401                                 }
 402                         }
 403                         index2d -= ystride;
 404                 }
 405                 index2d += ystride;
 406         }
 407
 408         return stone_surface_max_y;
 409 }
 410
 411
 412 MgStoneType MapgenV5::generateBiomes(float *heat_map, float *humidity_map)
 413 {
 414         v3s16 em = vm->m_area.getExtent();
 415         u32 index = 0;
 416         MgStoneType stone_type = STONE;
 417
 418         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 419         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 420                 Biome *biome = NULL;
 421                 u16 depth_top = 0;
 422                 u16 base_filler = 0;
 423                 u16 depth_water_top = 0;
 424                 u32 vi = vm->m_area.index(x, node_max.Y, z);
 425
 426                 // Check node at base of mapchunk above, either a node of a previously
 427                 // generated mapchunk or if not, a node of overgenerated base terrain.
 428                 content_t c_above = vm->m_data[vi + em.X].getContent();
 429                 bool air_above = c_above == CONTENT_AIR;
 430                 bool water_above = c_above == c_water_source;
 431
 432                 // If there is air or water above enable top/filler placement, otherwise force
 433                 // nplaced to stone level by setting a number exceeding any possible filler depth.
 434                 u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
 435
 436                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 437                         content_t c = vm->m_data[vi].getContent();
 438
 439                         // Biome is recalculated each time an upper surface is detected while
 440                         // working down a column. The selected biome then remains in effect for
 441                         // all nodes below until the next surface and biome recalculation.
 442                         // Biome is recalculated:
 443                         // 1. At the surface of stone below air or water.
 444                         // 2. At the surface of water below air.
 445                         // 3. When stone or water is detected but biome has not yet been calculated.
 446                         if ((c == c_stone && (air_above || water_above || !biome)) ||
 447                                         (c == c_water_source && (air_above || !biome))) {
 448                                 biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
 449                                 depth_top = biome->depth_top;
 450                                 base_filler = MYMAX(depth_top + biome->depth_filler
 451                                                 + noise_filler_depth->result[index], 0);
 452                                 depth_water_top = biome->depth_water_top;
 453
 454                                 // Detect stone type for dungeons during every biome calculation.
 455                                 // This is more efficient than detecting per-node and will not
 456                                 // miss any desert stone or sandstone biomes.
 457                                 if (biome->c_stone == c_desert_stone)
 458                                         stone_type = DESERT_STONE;
 459                                 else if (biome->c_stone == c_sandstone)
 460                                         stone_type = SANDSTONE;
 461                         }
 462
 463                         if (c == c_stone) {
 464                                 content_t c_below = vm->m_data[vi - em.X].getContent();
 465
 466                                 // If the node below isn't solid, make this node stone, so that
 467                                 // any top/filler nodes above are structurally supported.
 468                                 // This is done by aborting the cycle of top/filler placement
 469                                 // immediately by forcing nplaced to stone level.
 470                                 if (c_below == CONTENT_AIR || c_below == c_water_source)
 471                                         nplaced = U16_MAX;
 472
 473                                 if (nplaced < depth_top) {
 474                                         vm->m_data[vi] = MapNode(biome->c_top);
 475                                         nplaced++;
 476                                 } else if (nplaced < base_filler) {
 477                                         vm->m_data[vi] = MapNode(biome->c_filler);
 478                                         nplaced++;
 479                                 } else {
 480                                         vm->m_data[vi] = MapNode(biome->c_stone);
 481                                 }
 482
 483                                 air_above = false;
 484                                 water_above = false;
 485                         } else if (c == c_water_source) {
 486                                 vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top)) ?
 487                                                 biome->c_water_top : biome->c_water);
 488                                 nplaced = 0;  // Enable top/filler placement for next surface
 489                                 air_above = false;
 490                                 water_above = true;
 491                         } else if (c == CONTENT_AIR) {
 492                                 nplaced = 0;  // Enable top/filler placement for next surface
 493                                 air_above = true;
 494                                 water_above = false;
 495                         } else {  // Possible various nodes overgenerated from neighbouring mapchunks
 496                                 nplaced = U16_MAX;  // Disable top/filler placement
 497                                 air_above = false;
 498                                 water_above = false;
 499                         }
 500
 501                         vm->m_area.add_y(em, vi, -1);
 502                 }
 503         }
 504
 505         return stone_type;
 506 }
 507
 508
 509 void MapgenV5::generateCaves(int max_stone_y)
 510 {
 511         if (max_stone_y >= node_min.Y) {
 512                 u32 index = 0;
 513
 514                 for (s16 z = node_min.Z; z <= node_max.Z; z++)
 515                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
 516                         u32 i = vm->m_area.index(node_min.X, y, z);
 517                         for (s16 x = node_min.X; x <= node_max.X; x++, i++, index++) {
 518                                 float d1 = contour(noise_cave1->result[index]);
 519                                 float d2 = contour(noise_cave2->result[index]);
 520                                 if (d1*d2 > 0.125) {
 521                                         content_t c = vm->m_data[i].getContent();
 522                                         if (!ndef->get(c).is_ground_content || c == CONTENT_AIR)
 523                                                 continue;
 524
 525                                         vm->m_data[i] = MapNode(CONTENT_AIR);
 526                                 }
 527                         }
 528                 }
 529         }
 530
 531         if (node_max.Y > MGV5_LARGE_CAVE_DEPTH)
 532                 return;
 533
 534         PseudoRandom ps(blockseed + 21343);
 535         u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
 536         for (u32 i = 0; i < bruises_count; i++) {
 537                 CaveV5 cave(this, &ps);
 538                 cave.makeCave(node_min, node_max, max_stone_y);
 539         }
 540 }
 541
 542
 543 void MapgenV5::dustTopNodes()
 544 {
 545         if (node_max.Y < water_level)
 546                 return;
 547
 548         v3s16 em = vm->m_area.getExtent();
 549         u32 index = 0;
 550
 551         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 552         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 553                 Biome *biome = (Biome *)bmgr->getRaw(biomemap[index]);
 554
 555                 if (biome->c_dust == CONTENT_IGNORE)
 556                         continue;
 557
 558                 u32 vi = vm->m_area.index(x, full_node_max.Y, z);
 559                 content_t c_full_max = vm->m_data[vi].getContent();
 560                 s16 y_start;
 561
 562                 if (c_full_max == CONTENT_AIR) {
 563                         y_start = full_node_max.Y - 1;
 564                 } else if (c_full_max == CONTENT_IGNORE) {
 565                         vi = vm->m_area.index(x, node_max.Y + 1, z);
 566                         content_t c_max = vm->m_data[vi].getContent();
 567
 568                         if (c_max == CONTENT_AIR)
 569                                 y_start = node_max.Y;
 570                         else
 571                                 continue;
 572                 } else {
 573                         continue;
 574                 }
 575
 576                 vi = vm->m_area.index(x, y_start, z);
 577                 for (s16 y = y_start; y >= node_min.Y - 1; y--) {
 578                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 579                                 break;
 580
 581                         vm->m_area.add_y(em, vi, -1);
 582                 }
 583
 584                 content_t c = vm->m_data[vi].getContent();
 585                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
 586                         vm->m_area.add_y(em, vi, 1);
 587                         vm->m_data[vi] = MapNode(biome->c_dust);
 588                 }
 589         }
 590 }