src/mapgen_v5.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20
  21 #include "mapgen.h"
  22 #include "voxel.h"
  23 #include "noise.h"
  24 #include "mapblock.h"
  25 #include "mapnode.h"
  26 #include "map.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "voxelalgorithms.h"
  30 #include "profiler.h"
  31 #include "settings.h" // For g_settings
  32 #include "main.h" // For g_profiler
  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         {"blobs", MGV5_BLOBS},
  46         {NULL,         0}
  47 };
  48
  49
  50 MapgenV5::MapgenV5(int mapgenid, MapgenParams *params, EmergeManager *emerge)
  51         : Mapgen(mapgenid, params, emerge)
  52 {
  53         this->m_emerge = emerge;
  54         this->bmgr     = emerge->biomemgr;
  55
  56         // amount of elements to skip for the next index
  57         // for noise/height/biome maps (not vmanip)
  58         this->ystride = csize.X;
  59         this->zstride = csize.X * (csize.Y + 2);
  60
  61         this->biomemap  = new u8[csize.X * csize.Z];
  62         this->heightmap = new s16[csize.X * csize.Z];
  63
  64         MapgenV5Params *sp = (MapgenV5Params *)params->sparams;
  65         this->spflags      = sp->spflags;
  66
  67         // Terrain noise
  68         noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
  69         noise_factor       = new Noise(&sp->np_factor,       seed, csize.X, csize.Z);
  70         noise_height       = new Noise(&sp->np_height,       seed, csize.X, csize.Z);
  71
  72         // 3D terrain noise
  73         noise_cave1        = new Noise(&sp->np_cave1,   seed, csize.X, csize.Y + 2, csize.Z);
  74         noise_cave2        = new Noise(&sp->np_cave2,   seed, csize.X, csize.Y + 2, csize.Z);
  75         noise_ground       = new Noise(&sp->np_ground,  seed, csize.X, csize.Y + 2, csize.Z);
  76         noise_crumble      = new Noise(&sp->np_crumble, seed, csize.X, csize.Y + 2, csize.Z);
  77         noise_wetness      = new Noise(&sp->np_wetness, seed, csize.X, csize.Y + 2, csize.Z);
  78
  79         // Biome noise
  80         noise_heat         = new Noise(&params->np_biome_heat,     seed, csize.X, csize.Z);
  81         noise_humidity     = new Noise(&params->np_biome_humidity, seed, csize.X, csize.Z);
  82
  83         //// Resolve nodes to be used
  84         INodeDefManager *ndef = emerge->ndef;
  85
  86         c_stone           = ndef->getId("mapgen_stone");
  87         c_dirt            = ndef->getId("mapgen_dirt");
  88         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
  89         c_sand            = ndef->getId("mapgen_sand");
  90         c_water_source    = ndef->getId("mapgen_water_source");
  91         c_lava_source     = ndef->getId("mapgen_lava_source");
  92         c_gravel          = ndef->getId("mapgen_gravel");
  93         c_cobble          = ndef->getId("mapgen_cobble");
  94         c_ice             = ndef->getId("default:ice");
  95         c_mossycobble     = ndef->getId("mapgen_mossycobble");
  96         c_sandbrick       = ndef->getId("mapgen_sandstonebrick");
  97         c_stair_cobble    = ndef->getId("mapgen_stair_cobble");
  98         c_stair_sandstone = ndef->getId("mapgen_stair_sandstone");
  99         if (c_ice == CONTENT_IGNORE)
 100                 c_ice = CONTENT_AIR;
 101         if (c_mossycobble == CONTENT_IGNORE)
 102                 c_mossycobble = c_cobble;
 103         if (c_sandbrick == CONTENT_IGNORE)
 104                 c_sandbrick = c_desert_stone;
 105         if (c_stair_cobble == CONTENT_IGNORE)
 106                 c_stair_cobble = c_cobble;
 107         if (c_stair_sandstone == CONTENT_IGNORE)
 108                 c_stair_sandstone = c_sandbrick;
 109 }
 110
 111
 112 MapgenV5::~MapgenV5()
 113 {
 114         delete noise_filler_depth;
 115         delete noise_factor;
 116         delete noise_height;
 117         delete noise_cave1;
 118         delete noise_cave2;
 119         delete noise_ground;
 120         delete noise_crumble;
 121         delete noise_wetness;
 122
 123         delete noise_heat;
 124         delete noise_humidity;
 125
 126         delete[] heightmap;
 127         delete[] biomemap;
 128 }
 129
 130
 131 MapgenV5Params::MapgenV5Params()
 132 {
 133         spflags = MGV5_BLOBS;
 134
 135         np_filler_depth = NoiseParams(0, 1,  v3f(150, 150, 150), 261,    4, 0.7,  2.0);
 136         np_factor       = NoiseParams(0, 1,  v3f(250, 250, 250), 920381, 3, 0.45, 2.0);
 137         np_height       = NoiseParams(0, 10, v3f(250, 250, 250), 84174,  4, 0.5,  2.0);
 138         np_cave1        = NoiseParams(0, 12, v3f(50,  50,  50),  52534,  4, 0.5,  2.0);
 139         np_cave2        = NoiseParams(0, 12, v3f(50,  50,  50),  10325,  4, 0.5,  2.0);
 140         np_ground       = NoiseParams(0, 40, v3f(80,  80,  80),  983240, 4, 0.55, 2.0, NOISE_FLAG_EASED);
 141         np_crumble      = NoiseParams(0, 1,  v3f(20,  20,  20),  34413,  3, 1.3,  2.0, NOISE_FLAG_EASED);
 142         np_wetness      = NoiseParams(0, 1,  v3f(40,  40,  40),  32474,  4, 1.1,  2.0);
 143 }
 144
 145
 146 // Scaling the output of the noise function affects the overdrive of the
 147 // contour function, which affects the shape of the output considerably.
 148
 149 // Two original MT 0.3 parameters for non-eased noise:
 150
 151 //#define CAVE_NOISE_SCALE 12.0
 152 //#define CAVE_NOISE_THRESHOLD (1.5/CAVE_NOISE_SCALE)
 153
 154
 155 void MapgenV5Params::readParams(Settings *settings)
 156 {
 157         settings->getFlagStrNoEx("mgv5_spflags", spflags, flagdesc_mapgen_v5);
 158
 159         settings->getNoiseParams("mgv5_np_filler_depth", np_filler_depth);
 160         settings->getNoiseParams("mgv5_np_factor",       np_factor);
 161         settings->getNoiseParams("mgv5_np_height",       np_height);
 162         settings->getNoiseParams("mgv5_np_cave1",        np_cave1);
 163         settings->getNoiseParams("mgv5_np_cave2",        np_cave2);
 164         settings->getNoiseParams("mgv5_np_ground",       np_ground);
 165         settings->getNoiseParams("mgv5_np_crumble",      np_crumble);
 166         settings->getNoiseParams("mgv5_np_wetness",      np_wetness);
 167 }
 168
 169
 170 void MapgenV5Params::writeParams(Settings *settings)
 171 {
 172         settings->setFlagStr("mgv5_spflags", spflags, flagdesc_mapgen_v5, (u32)-1);
 173
 174         settings->setNoiseParams("mgv5_np_filler_depth", np_filler_depth);
 175         settings->setNoiseParams("mgv5_np_factor",       np_factor);
 176         settings->setNoiseParams("mgv5_np_height",       np_height);
 177         settings->setNoiseParams("mgv5_np_cave1",        np_cave1);
 178         settings->setNoiseParams("mgv5_np_cave2",        np_cave2);
 179         settings->setNoiseParams("mgv5_np_ground",       np_ground);
 180         settings->setNoiseParams("mgv5_np_crumble",      np_crumble);
 181         settings->setNoiseParams("mgv5_np_wetness",      np_wetness);
 182 }
 183
 184
 185 int MapgenV5::getGroundLevelAtPoint(v2s16 p)
 186 {
 187         //TimeTaker t("getGroundLevelAtPoint", NULL, PRECISION_MICRO);
 188
 189         float f = 0.55 + NoisePerlin2D(&noise_factor->np, p.X, p.Y, seed);
 190         if(f < 0.01)
 191                 f = 0.01;
 192         else if(f >= 1.0)
 193                 f *= 1.6;
 194         float h = water_level + NoisePerlin2D(&noise_height->np, p.X, p.Y, seed);
 195
 196         s16 search_top = water_level + 15;
 197         s16 search_base = water_level;
 198         // Use these 2 lines instead for a slower search returning highest ground level:
 199         //s16 search_top = h + f * noise_ground->np->octaves * noise_ground->np->scale;
 200         //s16 search_base = h - f * noise_ground->np->octaves * noise_ground->np->scale;
 201
 202         s16 level = -31000;
 203         for (s16 y = search_top; y >= search_base; y--) {
 204                 float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);
 205                 if(n_ground * f > y - h) {
 206                         if(y >= search_top - 7)
 207                                 break;
 208                         else
 209                                 level = y;
 210                                 break;
 211                 }
 212         }
 213
 214         //printf("getGroundLevelAtPoint: %dus\n", t.stop());
 215         return level;
 216 }
 217
 218
 219 void MapgenV5::makeChunk(BlockMakeData *data)
 220 {
 221         assert(data->vmanip);
 222         assert(data->nodedef);
 223         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 224                 data->blockpos_requested.Y >= data->blockpos_min.Y &&
 225                 data->blockpos_requested.Z >= data->blockpos_min.Z);
 226         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 227                 data->blockpos_requested.Y <= data->blockpos_max.Y &&
 228                 data->blockpos_requested.Z <= data->blockpos_max.Z);
 229
 230         generating = true;
 231         vm   = data->vmanip;
 232         ndef = data->nodedef;
 233         //TimeTaker t("makeChunk");
 234
 235         v3s16 blockpos_min = data->blockpos_min;
 236         v3s16 blockpos_max = data->blockpos_max;
 237         node_min = blockpos_min * MAP_BLOCKSIZE;
 238         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 239         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 240         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 241
 242         // Create a block-specific seed
 243         blockseed = getBlockSeed2(full_node_min, seed);
 244
 245         // Make some noise
 246         calculateNoise();
 247
 248         // Generate base terrain
 249         s16 stone_surface_max_y = generateBaseTerrain();
 250         updateHeightmap(node_min, node_max);
 251
 252         // Calculate biomes
 253         bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
 254                 noise_humidity->result, heightmap, biomemap);
 255
 256         // Actually place the biome-specific nodes
 257         generateBiomes();
 258
 259         // Generate caves
 260         if ((flags & MG_CAVES) && (stone_surface_max_y >= node_min.Y))
 261                 generateCaves();
 262
 263         // Generate dungeons and desert temples
 264         if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
 265                 DungeonGen dgen(this, NULL);
 266                 dgen.generate(blockseed, full_node_min, full_node_max);
 267         }
 268
 269         // Generate the registered decorations
 270         m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 271
 272         // Generate underground dirt, sand, gravel and lava blobs
 273         if (spflags & MGV5_BLOBS) {
 274                 generateBlobs();
 275         }
 276
 277         // Generate the registered ores
 278         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 279
 280         // Sprinkle some dust on top after everything else was generated
 281         dustTopNodes();
 282
 283         //printf("makeChunk: %dms\n", t.stop());
 284
 285         // Add top and bottom side of water to transforming_liquid queue
 286         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 287
 288         // Calculate lighting
 289         if (flags & MG_LIGHT) {
 290                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 291                         full_node_min, full_node_max);
 292         }
 293
 294         this->generating = false;
 295 }
 296
 297
 298 void MapgenV5::calculateNoise()
 299 {
 300         //TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
 301         int x = node_min.X;
 302         int y = node_min.Y - 1;
 303         int z = node_min.Z;
 304
 305         noise_factor->perlinMap2D(x, z);
 306         noise_height->perlinMap2D(x, z);
 307         noise_ground->perlinMap3D(x, y, z);
 308
 309         if (flags & MG_CAVES) {
 310                 noise_cave1->perlinMap3D(x, y, z);
 311                 noise_cave2->perlinMap3D(x, y, z);
 312         }
 313
 314         if (spflags & MGV5_BLOBS) {
 315                 noise_crumble->perlinMap3D(x, y, z);
 316                 noise_wetness->perlinMap3D(x, y, z);
 317         }
 318
 319         if (node_max.Y >= water_level) {
 320                 noise_filler_depth->perlinMap2D(x, z);
 321                 noise_heat->perlinMap2D(x, z);
 322                 noise_humidity->perlinMap2D(x, z);
 323         }
 324
 325         //printf("calculateNoise: %dus\n", t.stop());
 326 }
 327
 328
 329 // Two original MT 0.3 functions:
 330
 331 //bool is_cave(u32 index) {
 332 //      double d1 = contour(noise_cave1->result[index]);
 333 //      double d2 = contour(noise_cave2->result[index]);
 334 //      return d1*d2 > CAVE_NOISE_THRESHOLD;
 335 //}
 336
 337 //bool val_is_ground(v3s16 p, u32 index, u32 index2d) {
 338 //      double f = 0.55 + noise_factor->result[index2d];
 339 //      if(f < 0.01)
 340 //              f = 0.01;
 341 //      else if(f >= 1.0)
 342 //              f *= 1.6;
 343 //      double h = WATER_LEVEL + 10 * noise_height->result[index2d];
 344 //      return (noise_ground->result[index] * f > (double)p.Y - h);
 345 //}
 346
 347
 348 int MapgenV5::generateBaseTerrain()
 349 {
 350         u32 index = 0;
 351         u32 index2d = 0;
 352         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 353
 354         for(s16 z=node_min.Z; z<=node_max.Z; z++) {
 355                 for(s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
 356                         u32 i = vm->m_area.index(node_min.X, y, z);
 357                         for(s16 x=node_min.X; x<=node_max.X; x++, i++, index++, index2d++) {
 358                                 if(vm->m_data[i].getContent() != CONTENT_IGNORE)
 359                                         continue;
 360
 361                                 float f = 0.55 + noise_factor->result[index2d];
 362                                 if(f < 0.01)
 363                                         f = 0.01;
 364                                 else if(f >= 1.0)
 365                                         f *= 1.6;
 366                                 float h = water_level + noise_height->result[index2d];
 367
 368                                 if(noise_ground->result[index] * f < y - h) {
 369                                         if(y <= water_level)
 370                                                 vm->m_data[i] = MapNode(c_water_source);
 371                                         else
 372                                                 vm->m_data[i] = MapNode(CONTENT_AIR);
 373                                 } else {
 374                                         vm->m_data[i] = MapNode(c_stone);
 375                                         if (y > stone_surface_max_y)
 376                                                 stone_surface_max_y = y;
 377                                 }
 378                         }
 379                         index2d = index2d - ystride;
 380                 }
 381                 index2d = index2d + ystride;
 382         }
 383
 384         return stone_surface_max_y;
 385 }
 386
 387
 388 void MapgenV5::generateBiomes()
 389 {
 390         if (node_max.Y < water_level)
 391                 return;
 392
 393         MapNode n_air(CONTENT_AIR);
 394         MapNode n_stone(c_stone);
 395         MapNode n_water(c_water_source);
 396
 397         v3s16 em = vm->m_area.getExtent();
 398         u32 index = 0;
 399
 400         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 401         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 402                 Biome *biome        = (Biome *)bmgr->get(biomemap[index]);
 403                 s16 dfiller         = biome->depth_filler + noise_filler_depth->result[index];
 404                 s16 y0_top          = biome->depth_top;
 405                 s16 y0_filler       = biome->depth_top + dfiller;
 406                 s16 shore_max       = water_level + biome->height_shore;
 407                 s16 depth_water_top = biome->depth_water_top;
 408
 409                 s16 nplaced = 0;
 410                 u32 i = vm->m_area.index(x, node_max.Y, z);
 411
 412                 content_t c_above = vm->m_data[i + em.X].getContent();
 413                 bool have_air = c_above == CONTENT_AIR;
 414
 415                 for (s16 y = node_max.Y; y >= node_min.Y; y--) {
 416                         content_t c = vm->m_data[i].getContent();
 417
 418                         if (c == c_stone && have_air) {
 419                                 content_t c_below = vm->m_data[i - em.X].getContent();
 420
 421                                 if (c_below != CONTENT_AIR) {
 422                                         if (nplaced < y0_top) {
 423                                                 if(y < water_level)
 424                                                         vm->m_data[i] = MapNode(biome->c_underwater);
 425                                                 else if(y <= shore_max)
 426                                                         vm->m_data[i] = MapNode(biome->c_shore_top);
 427                                                 else
 428                                                         vm->m_data[i] = MapNode(biome->c_top);
 429                                                 nplaced++;
 430                                         } else if (nplaced < y0_filler && nplaced >= y0_top) {
 431                                                 if(y < water_level)
 432                                                         vm->m_data[i] = MapNode(biome->c_underwater);
 433                                                 else if(y <= shore_max)
 434                                                         vm->m_data[i] = MapNode(biome->c_shore_filler);
 435                                                 else
 436                                                         vm->m_data[i] = MapNode(biome->c_filler);
 437                                                 nplaced++;
 438                                         } else if (c == c_stone) {
 439                                                 have_air = false;
 440                                                 nplaced  = 0;
 441                                                 vm->m_data[i] = MapNode(biome->c_stone);
 442                                         } else {
 443                                                 have_air = false;
 444                                                 nplaced  = 0;
 445                                         }
 446                                 } else if (c == c_stone) {
 447                                         have_air = false;
 448                                         nplaced = 0;
 449                                         vm->m_data[i] = MapNode(biome->c_stone);
 450                                 }
 451                         } else if (c == c_stone) {
 452                                 have_air = false;
 453                                 nplaced = 0;
 454                                 vm->m_data[i] = MapNode(biome->c_stone);
 455                         } else if (c == c_water_source) {
 456                                 have_air = true;
 457                                 nplaced = 0;
 458                                 if(y > water_level - depth_water_top)
 459                                         vm->m_data[i] = MapNode(biome->c_water_top);
 460                                 else
 461                                         vm->m_data[i] = MapNode(biome->c_water);
 462                         } else if (c == CONTENT_AIR) {
 463                                 have_air = true;
 464                                 nplaced = 0;
 465                         }
 466
 467                         vm->m_area.add_y(em, i, -1);
 468                 }
 469         }
 470 }
 471
 472
 473 void MapgenV5::generateCaves()
 474 {
 475         u32 index = 0;
 476         u32 index2d = 0;
 477
 478         for(s16 z=node_min.Z; z<=node_max.Z; z++) {
 479                 for(s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
 480                         u32 i = vm->m_area.index(node_min.X, y, z);
 481                         for(s16 x=node_min.X; x<=node_max.X; x++, i++, index++, index2d++) {
 482                                 Biome *biome = (Biome *)bmgr->get(biomemap[index2d]);
 483                                 content_t c = vm->m_data[i].getContent();
 484                                 if(c == CONTENT_AIR
 485                                                 || (y <= water_level
 486                                                 && c != biome->c_stone
 487                                                 && c != c_stone))
 488                                         continue;
 489
 490                                 float d1 = contour(noise_cave1->result[index]);
 491                                 float d2 = contour(noise_cave2->result[index]);
 492                                 if(d1*d2 > 0.125)
 493                                         vm->m_data[i] = MapNode(CONTENT_AIR);
 494                         }
 495                         index2d = index2d - ystride;
 496                 }
 497                 index2d = index2d + ystride;
 498         }
 499 }
 500
 501
 502 void MapgenV5::generateBlobs()
 503 {
 504         u32 index = 0;
 505
 506         for(s16 z=node_min.Z; z<=node_max.Z; z++) {
 507                 for(s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
 508                         u32 i = vm->m_area.index(node_min.X, y, z);
 509                         for(s16 x=node_min.X; x<=node_max.X; x++, i++, index++) {
 510                                 content_t c = vm->m_data[i].getContent();
 511                                 if(c != c_stone)
 512                                         continue;
 513
 514                                 if(noise_crumble->result[index] > 1.3) {
 515                                         if(noise_wetness->result[index] > 0.0)
 516                                                 vm->m_data[i] = MapNode(c_dirt);
 517                                         else
 518                                                 vm->m_data[i] = MapNode(c_sand);
 519                                 } else if(noise_crumble->result[index] > 0.7) {
 520                                         if(noise_wetness->result[index] < -0.6)
 521                                                 vm->m_data[i] = MapNode(c_gravel);
 522                                 } else if(noise_crumble->result[index] < -3.5 +
 523                                                 MYMIN(0.1 *
 524                                                 sqrt((float)MYMAX(0, -y)), 1.5)) {
 525                                         vm->m_data[i] = MapNode(c_lava_source);
 526                                 }
 527                         }
 528                 }
 529         }
 530 }
 531
 532
 533 void MapgenV5::dustTopNodes()
 534 {
 535         if (node_max.Y < water_level)
 536                 return;
 537
 538         v3s16 em = vm->m_area.getExtent();
 539         u32 index = 0;
 540
 541         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 542         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 543                 Biome *biome = (Biome *)bmgr->get(biomemap[index]);
 544
 545                 if (biome->c_dust == CONTENT_IGNORE)
 546                         continue;
 547
 548                 s16 y = node_max.Y + 1;
 549                 u32 vi = vm->m_area.index(x, y, z);
 550                 for (; y >= node_min.Y; y--) {
 551                         if (vm->m_data[vi].getContent() != CONTENT_AIR)
 552                                 break;
 553
 554                         vm->m_area.add_y(em, vi, -1);
 555                 }
 556
 557                 content_t c = vm->m_data[vi].getContent();
 558                 if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE
 559                                 && c != biome->c_dust) {
 560                         if (y == node_max.Y + 1)
 561                                 continue;
 562
 563                         vm->m_area.add_y(em, vi, 1);
 564                         vm->m_data[vi] = MapNode(biome->c_dust);
 565                 }
 566         }
 567 }
 568