src/mapgen_v6.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   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 #include "mapgen.h"
  21 #include "voxel.h"
  22 #include "noise.h"
  23 #include "mapblock.h"
  24 #include "mapnode.h"
  25 #include "map.h"
  26 //#include "serverobject.h"
  27 #include "content_sao.h"
  28 #include "nodedef.h"
  29 #include "content_mapnode.h" // For content_mapnode_get_new_name
  30 #include "voxelalgorithms.h"
  31 #include "profiler.h"
  32 #include "settings.h" // For g_settings
  33 #include "main.h" // For g_profiler
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "treegen.h"
  37 #include "mapgen_v6.h"
  38
  39 /////////////////// Mapgen V6 perlin noise default values
  40 NoiseParams nparams_v6_def_terrain_base =
  41         {-AVERAGE_MUD_AMOUNT, 20.0, v3f(250.0, 250.0, 250.0), 82341, 5, 0.6};
  42 NoiseParams nparams_v6_def_terrain_higher =
  43         {20.0, 16.0, v3f(500.0, 500.0, 500.0), 85039, 5, 0.6};
  44 NoiseParams nparams_v6_def_steepness =
  45         {0.85, 0.5, v3f(125.0, 125.0, 125.0), -932, 5, 0.7};
  46 NoiseParams nparams_v6_def_height_select =
  47         {0.5, 1.0, v3f(250.0, 250.0, 250.0), 4213, 5, 0.69};
  48 NoiseParams nparams_v6_def_mud =
  49         {AVERAGE_MUD_AMOUNT, 2.0, v3f(200.0, 200.0, 200.0), 91013, 3, 0.55};
  50 NoiseParams nparams_v6_def_beach =
  51         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 59420, 3, 0.50};
  52 NoiseParams nparams_v6_def_biome =
  53         {0.0, 1.0, v3f(250.0, 250.0, 250.0), 9130, 3, 0.50};
  54 NoiseParams nparams_v6_def_cave =
  55         {6.0, 6.0, v3f(250.0, 250.0, 250.0), 34329, 3, 0.50};
  56 NoiseParams nparams_v6_def_humidity =
  57         {0.5, 0.5, v3f(500.0, 500.0, 500.0), 72384, 4, 0.66};
  58 NoiseParams nparams_v6_def_trees =
  59         {0.0, 1.0, v3f(125.0, 125.0, 125.0), 2, 4, 0.66};
  60 NoiseParams nparams_v6_def_apple_trees =
  61         {0.0, 1.0, v3f(100.0, 100.0, 100.0), 342902, 3, 0.45};
  62
  63
  64 ///////////////////////////////////////////////////////////////////////////////
  65
  66
  67 MapgenV6::MapgenV6(int mapgenid, MapgenV6Params *params) {
  68         this->generating  = false;
  69         this->id       = mapgenid;
  70
  71         this->seed     = (int)params->seed;
  72         this->water_level = params->water_level;
  73         this->flags   = params->flags;
  74         this->csize   = v3s16(1, 1, 1) * params->chunksize * MAP_BLOCKSIZE;
  75
  76         this->freq_desert = params->freq_desert;
  77         this->freq_beach  = params->freq_beach;
  78
  79         this->ystride = csize.X; //////fix this
  80
  81         np_cave        = params->np_cave;
  82         np_humidity    = params->np_humidity;
  83         np_trees       = params->np_trees;
  84         np_apple_trees = params->np_apple_trees;
  85
  86         noise_terrain_base   = new Noise(params->np_terrain_base,   seed, csize.X, csize.Y);
  87         noise_terrain_higher = new Noise(params->np_terrain_higher, seed, csize.X, csize.Y);
  88         noise_steepness      = new Noise(params->np_steepness,      seed, csize.X, csize.Y);
  89         noise_height_select  = new Noise(params->np_height_select,  seed, csize.X, csize.Y);
  90         noise_mud            = new Noise(params->np_mud,            seed, csize.X, csize.Y);
  91         noise_beach          = new Noise(params->np_beach,          seed, csize.X, csize.Y);
  92         noise_biome          = new Noise(params->np_biome,          seed, csize.X, csize.Y);
  93 }
  94
  95
  96 MapgenV6::~MapgenV6() {
  97         delete noise_terrain_base;
  98         delete noise_terrain_higher;
  99         delete noise_steepness;
 100         delete noise_height_select;
 101         delete noise_mud;
 102         delete noise_beach;
 103         delete noise_biome;
 104 }
 105
 106
 107 //////////////////////// Some helper functions for the map generator
 108
 109 // Returns Y one under area minimum if not found
 110 s16 MapgenV6::find_ground_level(v2s16 p2d) {
 111         v3s16 em = vm->m_area.getExtent();
 112         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 113         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 114         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 115         s16 y;
 116
 117         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 118                 MapNode &n = vm->m_data[i];
 119                 if(ndef->get(n).walkable)
 120                         break;
 121
 122                 vm->m_area.add_y(em, i, -1);
 123         }
 124         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 125 }
 126
 127 // Returns Y one under area minimum if not found
 128 s16 MapgenV6::find_stone_level(v2s16 p2d) {
 129         v3s16 em = vm->m_area.getExtent();
 130         s16 y_nodes_max = vm->m_area.MaxEdge.Y;
 131         s16 y_nodes_min = vm->m_area.MinEdge.Y;
 132         u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
 133         s16 y;
 134
 135         for (y = y_nodes_max; y >= y_nodes_min; y--) {
 136                 MapNode &n = vm->m_data[i];
 137                 content_t c = n.getContent();
 138                 if (c != CONTENT_IGNORE && (
 139                         c == c_stone || c == c_desert_stone))
 140                         break;
 141
 142                 vm->m_area.add_y(em, i, -1);
 143         }
 144         return (y >= y_nodes_min) ? y : y_nodes_min - 1;
 145 }
 146
 147
 148 // Required by mapgen.h
 149 bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 150 {
 151         /*s16 minimum_groundlevel = (s16)get_sector_minimum_ground_level(
 152                         seed, v2s16(blockpos.X, blockpos.Z));*/
 153         // Nah, this is just a heuristic, just return something
 154         s16 minimum_groundlevel = water_level;
 155
 156         if(blockpos.Y*MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 157                 return true;
 158         else
 159                 return false;
 160 }
 161
 162
 163 //////////////////////// Base terrain height functions
 164
 165 float MapgenV6::baseTerrainLevel(float terrain_base, float terrain_higher,
 166                                                                         float steepness, float height_select) {
 167         float base   = water_level + terrain_base;
 168         float higher = water_level + terrain_higher;
 169
 170         // Limit higher ground level to at least base
 171         if(higher < base)
 172                 higher = base;
 173
 174         // Steepness factor of cliffs
 175         float b = steepness;
 176         b = rangelim(b, 0.0, 1000.0);
 177         b = 5 * b * b * b * b * b * b * b;
 178         b = rangelim(b, 0.5, 1000.0);
 179
 180         // Values 1.5...100 give quite horrible looking slopes
 181         if (b > 1.5 && b < 100.0)
 182                 b = (b < 10.0) ? 1.5 : 100.0;
 183
 184         float a_off = -0.20; // Offset to more low
 185         float a = 0.5 + b * (a_off + height_select);
 186         a = rangelim(a, 0.0, 1.0); // Limit
 187
 188         return base * (1.0 - a) + higher * a;
 189 }
 190
 191
 192 float MapgenV6::baseTerrainLevelFromNoise(v2s16 p) {
 193         if (flags & MG_FLAT)
 194                 return water_level;
 195
 196         float terrain_base   = NoisePerlin2DPosOffset(noise_terrain_base->np,
 197                                                         p.X, 0.5, p.Y, 0.5, seed);
 198         float terrain_higher = NoisePerlin2DPosOffset(noise_terrain_higher->np,
 199                                                         p.X, 0.5, p.Y, 0.5, seed);
 200         float steepness      = NoisePerlin2DPosOffset(noise_steepness->np,
 201                                                         p.X, 0.5, p.Y, 0.5, seed);
 202         float height_select  = NoisePerlin2DNoTxfmPosOffset(noise_height_select->np,
 203                                                         p.X, 0.5, p.Y, 0.5, seed);
 204
 205         return baseTerrainLevel(terrain_base, terrain_higher,
 206                                                         steepness,    height_select);
 207 }
 208
 209
 210 float MapgenV6::baseTerrainLevelFromMap(v2s16 p) {
 211         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 212         return baseTerrainLevelFromMap(index);
 213 }
 214
 215
 216 float MapgenV6::baseTerrainLevelFromMap(int index) {
 217         if (flags & MG_FLAT)
 218                 return water_level;
 219
 220         float terrain_base   = noise_terrain_base->result[index];
 221         float terrain_higher = noise_terrain_higher->result[index];
 222         float steepness      = noise_steepness->result[index];
 223         float height_select  = noise_height_select->result[index];
 224
 225         return baseTerrainLevel(terrain_base, terrain_higher,
 226                                                         steepness,    height_select);
 227 }
 228
 229
 230 s16 MapgenV6::find_ground_level_from_noise(u64 seed, v2s16 p2d, s16 precision) {
 231         return baseTerrainLevelFromNoise(p2d) + AVERAGE_MUD_AMOUNT;
 232 }
 233
 234
 235 int MapgenV6::getGroundLevelAtPoint(v2s16 p) {
 236         return baseTerrainLevelFromNoise(p) + AVERAGE_MUD_AMOUNT;
 237 }
 238
 239
 240 //////////////////////// Noise functions
 241
 242 float MapgenV6::getMudAmount(v2s16 p) {
 243         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 244         return getMudAmount(index);
 245 }
 246
 247
 248 bool MapgenV6::getHaveBeach(v2s16 p) {
 249         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 250         return getHaveBeach(index);
 251 }
 252
 253
 254 BiomeType MapgenV6::getBiome(v2s16 p) {
 255         int index = (p.Y - node_min.Z) * ystride + (p.X - node_min.X);
 256         return getBiome(index, p);
 257 }
 258
 259
 260 float MapgenV6::getHumidity(v2s16 p)
 261 {
 262         /*double noise = noise2d_perlin(
 263                 0.5+(float)p.X/500, 0.5+(float)p.Y/500,
 264                 seed+72384, 4, 0.66);
 265         noise = (noise + 1.0)/2.0;*/
 266
 267         float noise = NoisePerlin2D(np_humidity, p.X, p.Y, seed);
 268
 269         if (noise < 0.0)
 270                 noise = 0.0;
 271         if (noise > 1.0)
 272                 noise = 1.0;
 273         return noise;
 274 }
 275
 276
 277 float MapgenV6::getTreeAmount(v2s16 p)
 278 {
 279         /*double noise = noise2d_perlin(
 280                         0.5+(float)p.X/125, 0.5+(float)p.Y/125,
 281                         seed+2, 4, 0.66);*/
 282
 283         float noise = NoisePerlin2D(np_trees, p.X, p.Y, seed);
 284         float zeroval = -0.39;
 285         if (noise < zeroval)
 286                 return 0;
 287         else
 288                 return 0.04 * (noise-zeroval) / (1.0-zeroval);
 289 }
 290
 291
 292 bool MapgenV6::getHaveAppleTree(v2s16 p)
 293 {
 294         /*is_apple_tree = noise2d_perlin(
 295                 0.5+(float)p.X/100, 0.5+(float)p.Z/100,
 296                 data->seed+342902, 3, 0.45) > 0.2;*/
 297
 298         float noise = NoisePerlin2D(np_apple_trees, p.X, p.Y, seed);
 299
 300         return noise > 0.2;
 301 }
 302
 303
 304 float MapgenV6::getMudAmount(int index)
 305 {
 306         if (flags & MG_FLAT)
 307                 return AVERAGE_MUD_AMOUNT;
 308
 309         /*return ((float)AVERAGE_MUD_AMOUNT + 2.0 * noise2d_perlin(
 310                         0.5+(float)p.X/200, 0.5+(float)p.Y/200,
 311                         seed+91013, 3, 0.55));*/
 312
 313         return noise_mud->result[index];
 314 }
 315
 316
 317 bool MapgenV6::getHaveBeach(int index)
 318 {
 319         // Determine whether to have sand here
 320         /*double sandnoise = noise2d_perlin(
 321                         0.2+(float)p2d.X/250, 0.7+(float)p2d.Y/250,
 322                         seed+59420, 3, 0.50);*/
 323
 324         float sandnoise = noise_beach->result[index];
 325         return (sandnoise > freq_beach);
 326 }
 327
 328
 329 BiomeType MapgenV6::getBiome(int index, v2s16 p)
 330 {
 331         // Just do something very simple as for now
 332         /*double d = noise2d_perlin(
 333                         0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
 334                         seed+9130, 3, 0.50);*/
 335
 336         float d = noise_biome->result[index];
 337         if (d > freq_desert)
 338                 return BT_DESERT;
 339
 340         if ((flags & MGV6_BIOME_BLEND) &&
 341                 (d > freq_desert - 0.10) &&
 342                 ((noise2d(p.X, p.Y, seed) + 1.0) > (freq_desert - d) * 20.0))
 343                 return BT_DESERT;
 344
 345         return BT_NORMAL;
 346 }
 347
 348
 349 u32 MapgenV6::get_blockseed(u64 seed, v3s16 p)
 350 {
 351         s32 x=p.X, y=p.Y, z=p.Z;
 352         return (u32)(seed%0x100000000ULL) + z*38134234 + y*42123 + x*23;
 353 }
 354
 355
 356 //////////////////////// Map generator
 357
 358 void MapgenV6::makeChunk(BlockMakeData *data) {
 359         assert(data->vmanip);
 360         assert(data->nodedef);
 361         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 362                    data->blockpos_requested.Y >= data->blockpos_min.Y &&
 363                    data->blockpos_requested.Z >= data->blockpos_min.Z);
 364         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 365                    data->blockpos_requested.Y <= data->blockpos_max.Y &&
 366                    data->blockpos_requested.Z <= data->blockpos_max.Z);
 367
 368         this->generating = true;
 369         this->vm   = data->vmanip;
 370         this->ndef = data->nodedef;
 371
 372         // Hack: use minimum block coords for old code that assumes a single block
 373         v3s16 blockpos = data->blockpos_requested;
 374         v3s16 blockpos_min = data->blockpos_min;
 375         v3s16 blockpos_max = data->blockpos_max;
 376         v3s16 blockpos_full_min = blockpos_min - v3s16(1,1,1);
 377         v3s16 blockpos_full_max = blockpos_max + v3s16(1,1,1);
 378
 379         // Area of central chunk
 380         node_min = blockpos_min*MAP_BLOCKSIZE;
 381         node_max = (blockpos_max+v3s16(1,1,1))*MAP_BLOCKSIZE-v3s16(1,1,1);
 382
 383         // Full allocated area
 384         full_node_min = (blockpos_min-1)*MAP_BLOCKSIZE;
 385         full_node_max = (blockpos_max+2)*MAP_BLOCKSIZE-v3s16(1,1,1);
 386
 387         central_area_size = node_max - node_min + v3s16(1,1,1);
 388         assert(central_area_size.X == central_area_size.Z);
 389
 390         int volume_blocks = (blockpos_max.X - blockpos_min.X + 1)
 391                                           * (blockpos_max.Y - blockpos_min.Y + 1)
 392                                           * (blockpos_max.Z - blockpos_max.Z + 1);
 393
 394         volume_nodes = volume_blocks *
 395                 MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE;
 396
 397         // Create a block-specific seed
 398         blockseed = get_blockseed(data->seed, full_node_min);
 399
 400         // Make some noise
 401         calculateNoise();
 402
 403         c_stone           = ndef->getId("mapgen_stone");
 404         c_dirt            = ndef->getId("mapgen_dirt");
 405         c_dirt_with_grass = ndef->getId("mapgen_dirt_with_grass");
 406         c_sand            = ndef->getId("mapgen_sand");
 407         c_water_source    = ndef->getId("mapgen_water_source");
 408         c_lava_source     = ndef->getId("mapgen_lava_source");
 409         c_gravel          = ndef->getId("mapgen_gravel");
 410         c_cobble          = ndef->getId("mapgen_cobble");
 411         c_desert_sand     = ndef->getId("mapgen_desert_sand");
 412         c_desert_stone    = ndef->getId("mapgen_desert_stone");
 413         if (c_desert_sand == CONTENT_IGNORE)
 414                 c_desert_sand = c_sand;
 415         if (c_desert_stone == CONTENT_IGNORE)
 416                 c_desert_stone = c_stone;
 417
 418         // Maximum height of the stone surface and obstacles.
 419         // This is used to guide the cave generation
 420         s16 stone_surface_max_y;
 421
 422         // Generate general ground level to full area
 423         stone_surface_max_y = generateGround();
 424
 425         generateSomething();
 426
 427         const s16 max_spread_amount = MAP_BLOCKSIZE;
 428         // Limit dirt flow area by 1 because mud is flown into neighbors.
 429         s16 mudflow_minpos = -max_spread_amount + 1;
 430         s16 mudflow_maxpos = central_area_size.X + max_spread_amount - 2;
 431
 432         // Loop this part, it will make stuff look older and newer nicely
 433         const u32 age_loops = 2;
 434         for (u32 i_age = 0; i_age < age_loops; i_age++) { // Aging loop
 435                 // Make caves (this code is relatively horrible)
 436                 if (flags & MG_CAVES)
 437                         generateCaves(stone_surface_max_y);
 438
 439                 // Add mud to the central chunk
 440                 addMud();
 441
 442                 // Add blobs of dirt and gravel underground
 443                 addDirtGravelBlobs();
 444
 445                 // Flow mud away from steep edges
 446                 flowMud(mudflow_minpos, mudflow_maxpos);
 447
 448         }
 449
 450         // Add dungeons
 451         if (flags & MG_DUNGEONS) {
 452                 DungeonGen dgen(ndef, data->seed, water_level);
 453                 dgen.generate(vm, blockseed, full_node_min, full_node_max);
 454         }
 455
 456         // Add top and bottom side of water to transforming_liquid queue
 457         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 458
 459         // Grow grass
 460         growGrass();
 461
 462         // Generate some trees, and add grass, if a jungle
 463         if (flags & MG_TREES)
 464                 placeTreesAndJungleGrass();
 465
 466         // Calculate lighting
 467         calcLighting(node_min, node_max);
 468
 469         this->generating = false;
 470 }
 471
 472
 473 void MapgenV6::calculateNoise() {
 474         int x = node_min.X;
 475         int z = node_min.Z;
 476
 477         // Need to adjust for the original implementation's +.5 offset...
 478         if (!(flags & MG_FLAT)) {
 479                 noise_terrain_base->perlinMap2D(
 480                         x + 0.5 * noise_terrain_base->np->spread.X,
 481                         z + 0.5 * noise_terrain_base->np->spread.Z);
 482                 noise_terrain_base->transformNoiseMap();
 483
 484                 noise_terrain_higher->perlinMap2D(
 485                         x + 0.5 * noise_terrain_higher->np->spread.X,
 486                         z + 0.5 * noise_terrain_higher->np->spread.Z);
 487                 noise_terrain_higher->transformNoiseMap();
 488
 489                 noise_steepness->perlinMap2D(
 490                         x + 0.5 * noise_steepness->np->spread.X,
 491                         z + 0.5 * noise_steepness->np->spread.Z);
 492                 noise_steepness->transformNoiseMap();
 493
 494                 noise_height_select->perlinMap2D(
 495                         x + 0.5 * noise_height_select->np->spread.X,
 496                         z + 0.5 * noise_height_select->np->spread.Z);
 497         }
 498
 499         if (!(flags & MG_FLAT)) {
 500                 noise_mud->perlinMap2D(
 501                         x + 0.5 * noise_mud->np->spread.X,
 502                         z + 0.5 * noise_mud->np->spread.Z);
 503                 noise_mud->transformNoiseMap();
 504         }
 505         noise_beach->perlinMap2D(
 506                 x + 0.2 * noise_beach->np->spread.X,
 507                 z + 0.7 * noise_beach->np->spread.Z);
 508
 509         noise_biome->perlinMap2D(
 510                 x + 0.6 * noise_biome->np->spread.X,
 511                 z + 0.2 * noise_biome->np->spread.Z);
 512 }
 513
 514
 515 int MapgenV6::generateGround() {
 516         //TimeTaker timer1("Generating ground level");
 517         MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 518         MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 519         int stone_surface_max_y = -MAP_GENERATION_LIMIT;
 520         u32 index = 0;
 521
 522         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 523         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 524                 // Surface height
 525                 s16 surface_y = (s16)baseTerrainLevelFromMap(index);
 526
 527                 // Log it
 528                 if (surface_y > stone_surface_max_y)
 529                         stone_surface_max_y = surface_y;
 530
 531                 BiomeType bt = getBiome(index, v2s16(x, z));
 532
 533                 // Fill ground with stone
 534                 v3s16 em = vm->m_area.getExtent();
 535                 u32 i = vm->m_area.index(x, node_min.Y, z);
 536                 for (s16 y = node_min.Y; y <= node_max.Y; y++) {
 537                         if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
 538                                 if (y <= surface_y) {
 539                                         vm->m_data[i] = (y > water_level && bt == BT_DESERT) ?
 540                                                 n_desert_stone : n_stone;
 541                                 } else if (y <= water_level) {
 542                                         vm->m_data[i] = n_water_source;
 543                                 } else {
 544                                         vm->m_data[i] = n_air;
 545                                 }
 546                         }
 547                         vm->m_area.add_y(em, i, 1);
 548                 }
 549         }
 550
 551         return stone_surface_max_y;
 552 }
 553
 554
 555 void MapgenV6::addMud() {
 556         // 15ms @cs=8
 557         //TimeTaker timer1("add mud");
 558         MapNode n_dirt(c_dirt), n_gravel(c_gravel);
 559         MapNode n_sand(c_sand), n_desert_sand(c_desert_sand);
 560         MapNode addnode;
 561
 562         u32 index = 0;
 563         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 564         for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
 565                 // Randomize mud amount
 566                 s16 mud_add_amount = getMudAmount(index) / 2.0 + 0.5;
 567
 568                 // Find ground level
 569                 s16 surface_y = find_stone_level(v2s16(x, z)); /////////////////optimize this!
 570
 571                 // Handle area not found
 572                 if (surface_y == vm->m_area.MinEdge.Y - 1)
 573                         continue;
 574
 575                 BiomeType bt = getBiome(index, v2s16(x, z));
 576                 addnode = (bt == BT_DESERT) ? n_desert_sand : n_dirt;
 577
 578                 if (bt == BT_DESERT && surface_y + mud_add_amount <= water_level + 1) {
 579                         addnode = n_sand;
 580                 } else if (mud_add_amount <= 0) {
 581                         mud_add_amount = 1 - mud_add_amount;
 582                         addnode = n_gravel;
 583                 } else if (bt == BT_NORMAL && getHaveBeach(index) &&
 584                                 surface_y + mud_add_amount <= water_level + 2) {
 585                         addnode = n_sand;
 586                 }
 587
 588                 if (bt == BT_DESERT && surface_y > 20)
 589                         mud_add_amount = MYMAX(0, mud_add_amount - (surface_y - 20) / 5);
 590
 591                 // If topmost node is grass, change it to mud.  It might be if it was
 592                 // flown to there from a neighboring chunk and then converted.
 593                 u32 i = vm->m_area.index(x, surface_y, z);
 594                 if (vm->m_data[i].getContent() == c_dirt_with_grass)
 595                         vm->m_data[i] = n_dirt;
 596
 597                 // Add mud on ground
 598                 s16 mudcount = 0;
 599                 v3s16 em = vm->m_area.getExtent();
 600                 s16 y_start = surface_y + 1;
 601                 i = vm->m_area.index(x, y_start, z);
 602                 for (s16 y = y_start; y <= node_max.Y; y++) {
 603                         if (mudcount >= mud_add_amount)
 604                                 break;
 605
 606                         vm->m_data[i] = addnode;
 607                         mudcount++;
 608
 609                         vm->m_area.add_y(em, i, 1);
 610                 }
 611         }
 612 }
 613
 614
 615 void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos) {
 616         // 340ms @cs=8
 617         TimeTaker timer1("flow mud");
 618
 619         // Iterate a few times
 620         for(s16 k = 0; k < 3; k++) {
 621                 for (s16 z = mudflow_minpos; z <= mudflow_maxpos; z++)
 622                 for (s16 x = mudflow_minpos; x <= mudflow_maxpos; x++) {
 623                         // Invert coordinates every 2nd iteration
 624                         if (k % 2 == 0) {
 625                                 x = mudflow_maxpos - (x - mudflow_minpos);
 626                                 z = mudflow_maxpos - (z - mudflow_minpos);
 627                         }
 628
 629                         // Node position in 2d
 630                         v2s16 p2d = v2s16(node_min.X, node_min.Z) + v2s16(x, z);
 631
 632                         v3s16 em = vm->m_area.getExtent();
 633                         u32 i = vm->m_area.index(p2d.X, node_max.Y, p2d.Y);
 634                         s16 y = node_max.Y;
 635
 636                         while(y >= node_min.Y)
 637                         {
 638
 639                         for(;; y--)
 640                         {
 641                                 MapNode *n = NULL;
 642                                 // Find mud
 643                                 for(; y >= node_min.Y; y--) {
 644                                         n = &vm->m_data[i];
 645                                         if (n->getContent() == c_dirt ||
 646                                                 n->getContent() == c_dirt_with_grass ||
 647                                                 n->getContent() == c_gravel)
 648                                                 break;
 649
 650                                         vm->m_area.add_y(em, i, -1);
 651                                 }
 652
 653                                 // Stop if out of area
 654                                 //if(vmanip.m_area.contains(i) == false)
 655                                 if (y < node_min.Y)
 656                                         break;
 657
 658                                 if (n->getContent() == c_dirt ||
 659                                         n->getContent() == c_dirt_with_grass)
 660                                 {
 661                                         // Make it exactly mud
 662                                         n->setContent(c_dirt);
 663
 664                                         // Don't flow it if the stuff under it is not mud
 665                                         {
 666                                                 u32 i2 = i;
 667                                                 vm->m_area.add_y(em, i2, -1);
 668                                                 // Cancel if out of area
 669                                                 if(vm->m_area.contains(i2) == false)
 670                                                         continue;
 671                                                 MapNode *n2 = &vm->m_data[i2];
 672                                                 if (n2->getContent() != c_dirt &&
 673                                                         n2->getContent() != c_dirt_with_grass)
 674                                                         continue;
 675                                         }
 676                                 }
 677
 678                                 v3s16 dirs4[4] = {
 679                                         v3s16(0,0,1), // back
 680                                         v3s16(1,0,0), // right
 681                                         v3s16(0,0,-1), // front
 682                                         v3s16(-1,0,0), // left
 683                                 };
 684
 685                                 // Check that upper is air or doesn't exist.
 686                                 // Cancel dropping if upper keeps it in place
 687                                 u32 i3 = i;
 688                                 vm->m_area.add_y(em, i3, 1);
 689                                 if (vm->m_area.contains(i3) == true &&
 690                                         ndef->get(vm->m_data[i3]).walkable)
 691                                         continue;
 692
 693                                 // Drop mud on side
 694                                 for(u32 di=0; di<4; di++) {
 695                                         v3s16 dirp = dirs4[di];
 696                                         u32 i2 = i;
 697                                         // Move to side
 698                                         vm->m_area.add_p(em, i2, dirp);
 699                                         // Fail if out of area
 700                                         if (vm->m_area.contains(i2) == false)
 701                                                 continue;
 702                                         // Check that side is air
 703                                         MapNode *n2 = &vm->m_data[i2];
 704                                         if (ndef->get(*n2).walkable)
 705                                                 continue;
 706                                         // Check that under side is air
 707                                         vm->m_area.add_y(em, i2, -1);
 708                                         if (vm->m_area.contains(i2) == false)
 709                                                 continue;
 710                                         n2 = &vm->m_data[i2];
 711                                         if (ndef->get(*n2).walkable)
 712                                                 continue;
 713                                         // Loop further down until not air
 714                                         bool dropped_to_unknown = false;
 715                                         do {
 716                                                 vm->m_area.add_y(em, i2, -1);
 717                                                 n2 = &vm->m_data[i2];
 718                                                 // if out of known area
 719                                                 if(vm->m_area.contains(i2) == false ||
 720                                                         n2->getContent() == CONTENT_IGNORE) {
 721                                                         dropped_to_unknown = true;
 722                                                         break;
 723                                                 }
 724                                         } while (ndef->get(*n2).walkable == false);
 725                                         // Loop one up so that we're in air
 726                                         vm->m_area.add_y(em, i2, 1);
 727                                         n2 = &vm->m_data[i2];
 728
 729                                         bool old_is_water = (n->getContent() == c_water_source);
 730                                         // Move mud to new place
 731                                         if (!dropped_to_unknown) {
 732                                                 *n2 = *n;
 733                                                 // Set old place to be air (or water)
 734                                                 if(old_is_water)
 735                                                         *n = MapNode(c_water_source);
 736                                                 else
 737                                                         *n = MapNode(CONTENT_AIR);
 738                                         }
 739
 740                                         // Done
 741                                         break;
 742                                 }
 743                         }
 744                         }
 745                 }
 746         }
 747 }
 748
 749
 750 void MapgenV6::addDirtGravelBlobs() {
 751         if (getBiome(v2s16(node_min.X, node_min.Z)) != BT_NORMAL)
 752                 return;
 753
 754         PseudoRandom pr(blockseed + 983);
 755         for (int i = 0; i < volume_nodes/10/10/10; i++) {
 756                 bool only_fill_cave = (myrand_range(0,1) != 0);
 757                 v3s16 size(
 758                         pr.range(1, 8),
 759                         pr.range(1, 8),
 760                         pr.range(1, 8)
 761                 );
 762                 v3s16 p0(
 763                         pr.range(node_min.X, node_max.X) - size.X / 2,
 764                         pr.range(node_min.Y, node_max.Y) - size.Y / 2,
 765                         pr.range(node_min.Z, node_max.Z) - size.Z / 2
 766                 );
 767
 768                 MapNode n1((p0.Y > -32 && !pr.range(0, 1)) ? c_dirt : c_gravel);
 769                 for (int z1 = 0; z1 < size.Z; z1++)
 770                 for (int y1 = 0; y1 < size.Y; y1++)
 771                 for (int x1 = 0; x1 < size.X; x1++) {
 772                         v3s16 p = p0 + v3s16(x1, y1, z1);
 773                         u32 i = vm->m_area.index(p);
 774                         if (!vm->m_area.contains(i))
 775                                 continue;
 776                         // Cancel if not stone and not cave air
 777                         if (vm->m_data[i].getContent() != c_stone &&
 778                                 !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 779                                 continue;
 780                         if (only_fill_cave && !(vm->m_flags[i] & VMANIP_FLAG_CAVE))
 781                                 continue;
 782                         vm->m_data[i] = n1;
 783                 }
 784         }
 785 }
 786
 787
 788 void MapgenV6::placeTreesAndJungleGrass() {
 789         //TimeTaker t("placeTrees");
 790         if (node_max.Y < water_level)
 791                 return;
 792
 793         PseudoRandom grassrandom(blockseed + 53);
 794         content_t c_junglegrass = ndef->getId("mapgen_junglegrass");
 795         // if we don't have junglegrass, don't place cignore... that's bad
 796         if (c_junglegrass == CONTENT_IGNORE)
 797                 c_junglegrass = CONTENT_AIR;
 798         MapNode n_junglegrass(c_junglegrass);
 799         v3s16 em = vm->m_area.getExtent();
 800
 801         // Divide area into parts
 802         s16 div = 8;
 803         s16 sidelen = central_area_size.X / div;
 804         double area = sidelen * sidelen;
 805
 806         // N.B.  We must add jungle grass first, since tree leaves will
 807         // obstruct the ground, giving us a false ground level
 808         for (s16 z0 = 0; z0 < div; z0++)
 809         for (s16 x0 = 0; x0 < div; x0++) {
 810                 // Center position of part of division
 811                 v2s16 p2d_center(
 812                         node_min.X + sidelen / 2 + sidelen * x0,
 813                         node_min.Z + sidelen / 2 + sidelen * z0
 814                 );
 815                 // Minimum edge of part of division
 816                 v2s16 p2d_min(
 817                         node_min.X + sidelen * x0,
 818                         node_min.Z + sidelen * z0
 819                 );
 820                 // Maximum edge of part of division
 821                 v2s16 p2d_max(
 822                         node_min.X + sidelen + sidelen * x0 - 1,
 823                         node_min.Z + sidelen + sidelen * z0 - 1
 824                 );
 825
 826                 // Amount of trees, jungle area
 827                 u32 tree_count = area * getTreeAmount(p2d_center);
 828
 829                 float humidity;
 830                 bool is_jungle = false;
 831                 if (flags & MGV6_JUNGLES) {
 832                         humidity = getHumidity(p2d_center);
 833                         if (humidity > 0.75) {
 834                                 is_jungle = true;
 835                                 tree_count *= 4;
 836                         }
 837                 }
 838
 839                 // Add jungle grass
 840                 if (is_jungle) {
 841                         u32 grass_count = 5 * humidity * tree_count;
 842                         for (u32 i = 0; i < grass_count; i++) {
 843                                 s16 x = grassrandom.range(p2d_min.X, p2d_max.X);
 844                                 s16 z = grassrandom.range(p2d_min.Y, p2d_max.Y);
 845
 846                                 s16 y = find_ground_level(v2s16(x, z)); ////////////////optimize this!
 847                                 if (y < water_level || y < node_min.Y || y > node_max.Y)
 848                                         continue;
 849
 850                                 u32 vi = vm->m_area.index(x, y, z);
 851                                 // place on dirt_with_grass, since we know it is exposed to sunlight
 852                                 if (vm->m_data[vi].getContent() == c_dirt_with_grass) {
 853                                         vm->m_area.add_y(em, vi, 1);
 854                                         vm->m_data[vi] = n_junglegrass;
 855                                 }
 856                         }
 857                 }
 858
 859                 // Put trees in random places on part of division
 860                 for (u32 i = 0; i < tree_count; i++) {
 861                         s16 x = myrand_range(p2d_min.X, p2d_max.X);
 862                         s16 z = myrand_range(p2d_min.Y, p2d_max.Y);
 863                         s16 y = find_ground_level(v2s16(x, z)); ////////////////////optimize this!
 864                         // Don't make a tree under water level
 865                         // Don't make a tree so high that it doesn't fit
 866                         if(y < water_level || y > node_max.Y - 6)
 867                                 continue;
 868
 869                         v3s16 p(x,y,z);
 870                         // Trees grow only on mud and grass
 871                         {
 872                                 u32 i = vm->m_area.index(p);
 873                                 MapNode *n = &vm->m_data[i];
 874                                 if (n->getContent() != c_dirt &&
 875                                         n->getContent() != c_dirt_with_grass)
 876                                         continue;
 877                         }
 878                         p.Y++;
 879
 880                         // Make a tree
 881                         if (is_jungle) {
 882                                 treegen::make_jungletree(*vm, p, ndef, myrand());
 883                         } else {
 884                                 bool is_apple_tree = (myrand_range(0, 3) == 0) &&
 885                                                                                 getHaveAppleTree(v2s16(x, z));
 886                                 treegen::make_tree(*vm, p, is_apple_tree, ndef, myrand());
 887                         }
 888                 }
 889         }
 890         //printf("placeTreesAndJungleGrass: %dms\n", t.stop());
 891 }
 892
 893
 894 void MapgenV6::growGrass() {
 895         for (s16 z = full_node_min.Z; z <= full_node_max.Z; z++)
 896         for (s16 x = full_node_min.X; x <= full_node_max.X; x++) {
 897                 // Find the lowest surface to which enough light ends up to make
 898                 // grass grow.  Basically just wait until not air and not leaves.
 899                 s16 surface_y = 0;
 900                 {
 901                         v3s16 em = vm->m_area.getExtent();
 902                         u32 i = vm->m_area.index(x, node_max.Y, z);
 903                         s16 y;
 904                         // Go to ground level
 905                         for (y = node_max.Y; y >= full_node_min.Y; y--) {
 906                                 MapNode &n = vm->m_data[i];
 907                                 if (ndef->get(n).param_type != CPT_LIGHT ||
 908                                         ndef->get(n).liquid_type != LIQUID_NONE)
 909                                         break;
 910                                 vm->m_area.add_y(em, i, -1);
 911                         }
 912                         surface_y = (y >= full_node_min.Y) ? y : full_node_min.Y;
 913                 }
 914
 915                 u32 i = vm->m_area.index(x, surface_y, z);
 916                 MapNode *n = &vm->m_data[i];
 917                 if (n->getContent() == c_dirt && surface_y >= water_level - 20)
 918                         n->setContent(c_dirt_with_grass);
 919         }
 920 }
 921
 922
 923 void MapgenV6::defineCave(Cave &cave, PseudoRandom ps,
 924                                                  v3s16 node_min, bool large_cave) {
 925                 cave.min_tunnel_diameter = 2;
 926                 cave.max_tunnel_diameter = ps.range(2,6);
 927                 cave.dswitchint = ps.range(1,14);
 928                 cave.flooded = true; //large_cave && ps.range(0,4);
 929                 if(large_cave){
 930                         cave.part_max_length_rs = ps.range(2,4);
 931                         cave.tunnel_routepoints = ps.range(5, ps.range(15,30));
 932                         cave.min_tunnel_diameter = 5;
 933                         cave.max_tunnel_diameter = ps.range(7, ps.range(8,24));
 934                 } else {
 935                         cave.part_max_length_rs = ps.range(2,9);
 936                         cave.tunnel_routepoints = ps.range(10, ps.range(15,30));
 937                 }
 938                 cave.large_cave_is_flat = (ps.range(0,1) == 0);
 939 }
 940
 941
 942 void MapgenV6::generateCaves(int max_stone_y) {
 943         // 24ms @cs=8
 944         //TimeTaker timer1("caves");
 945
 946         /*double cave_amount = 6.0 + 6.0 * noise2d_perlin(
 947                 0.5+(double)node_min.X/250, 0.5+(double)node_min.Y/250,
 948                 data->seed+34329, 3, 0.50);*/
 949         const s16 max_spread_amount = MAP_BLOCKSIZE;
 950         float cave_amount = NoisePerlin2D(np_cave, node_min.X, node_min.Y, seed);
 951
 952         cave_amount = MYMAX(0.0, cave_amount);
 953         u32 caves_count = cave_amount * volume_nodes / 50000;
 954         u32 bruises_count = 1;
 955         PseudoRandom ps(blockseed + 21343);
 956         PseudoRandom ps2(blockseed + 1032);
 957
 958         if (ps.range(1, 6) == 1)
 959                 bruises_count = ps.range(0, ps.range(0, 2));
 960
 961         if (getBiome(v2s16(node_min.X, node_min.Z)) == BT_DESERT) {
 962                 caves_count   /= 3;
 963                 bruises_count /= 3;
 964         }
 965
 966         for(u32 jj = 0; jj < caves_count + bruises_count; jj++) {
 967                 /*int avg_height = (int)
 968                           ((base_rock_level_2d(data->seed, v2s16(node_min.X, node_min.Z)) +
 969                                 base_rock_level_2d(data->seed, v2s16(node_max.X, node_max.Z))) / 2);
 970                 if ((node_max.Y + node_min.Y) / 2 > avg_height)
 971                         break;*/
 972
 973                 bool large_cave = (jj >= caves_count);
 974
 975                 Cave cave;
 976                 defineCave(cave, ps, node_min, large_cave);
 977
 978                 v3f main_direction(0,0,0);
 979
 980                 // Allowed route area size in nodes
 981                 v3s16 ar = central_area_size;
 982
 983                 // Area starting point in nodes
 984                 v3s16 of = node_min;
 985
 986                 // Allow a bit more
 987                 //(this should be more than the maximum radius of the tunnel)
 988                 s16 insure = 10;
 989                 s16 more = max_spread_amount - cave.max_tunnel_diameter / 2 - insure;
 990                 ar += v3s16(1,0,1) * more * 2;
 991                 of -= v3s16(1,0,1) * more;
 992
 993                 s16 route_y_min = 0;
 994                 // Allow half a diameter + 7 over stone surface
 995                 s16 route_y_max = -of.Y + max_stone_y + cave.max_tunnel_diameter/2 + 7;
 996
 997                 // Limit maximum to area
 998                 route_y_max = rangelim(route_y_max, 0, ar.Y-1);
 999
1000                 if(large_cave)
1001                 {
1002                         s16 min = 0;
1003                         if(node_min.Y < water_level && node_max.Y > water_level)
1004                         {
1005                                 min = water_level - cave.max_tunnel_diameter/3 - of.Y;
1006                                 route_y_max = water_level + cave.max_tunnel_diameter/3 - of.Y;
1007                         }
1008                         route_y_min = ps.range(min, min + cave.max_tunnel_diameter);
1009                         route_y_min = rangelim(route_y_min, 0, route_y_max);
1010                 }
1011
1012                 s16 route_start_y_min = route_y_min;
1013                 s16 route_start_y_max = route_y_max;
1014
1015                 route_start_y_min = rangelim(route_start_y_min, 0, ar.Y-1);
1016                 route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y-1);
1017
1018                 // Randomize starting position
1019                 v3f orp(
1020                         (float)(ps.next()%ar.X)+0.5,
1021                         (float)(ps.range(route_start_y_min, route_start_y_max))+0.5,
1022                         (float)(ps.next()%ar.Z)+0.5
1023                 );
1024
1025                 v3s16 startp(orp.X, orp.Y, orp.Z);
1026                 startp += of;
1027
1028                 MapNode airnode(CONTENT_AIR);
1029                 MapNode waternode(c_water_source);
1030                 MapNode lavanode(c_lava_source);
1031
1032                 /*
1033                         Generate some tunnel starting from orp
1034                 */
1035
1036                 for(u16 j=0; j<cave.tunnel_routepoints; j++)
1037                 {
1038                         if(j%cave.dswitchint==0 && large_cave == false)
1039                         {
1040                                 main_direction = v3f(
1041                                         ((float)(ps.next()%20)-(float)10)/10,
1042                                         ((float)(ps.next()%20)-(float)10)/30,
1043                                         ((float)(ps.next()%20)-(float)10)/10
1044                                 );
1045                                 main_direction *= (float)ps.range(0, 10)/10;
1046                         }
1047
1048                         // Randomize size
1049                         s16 min_d = cave.min_tunnel_diameter;
1050                         s16 max_d = cave.max_tunnel_diameter;
1051                         s16 rs = ps.range(min_d, max_d);
1052
1053                         // Every second section is rough
1054                         bool randomize_xz = (ps2.range(1,2) == 1);
1055
1056                         v3s16 maxlen;
1057                         if(large_cave)
1058                         {
1059                                 maxlen = v3s16(
1060                                         rs*cave.part_max_length_rs,
1061                                         rs*cave.part_max_length_rs/2,
1062                                         rs*cave.part_max_length_rs
1063                                 );
1064                         }
1065                         else
1066                         {
1067                                 maxlen = v3s16(
1068                                         rs*cave.part_max_length_rs,
1069                                         ps.range(1, rs*cave.part_max_length_rs),
1070                                         rs*cave.part_max_length_rs
1071                                 );
1072                         }
1073
1074                         v3f vec;
1075
1076                         vec = v3f(
1077                                 (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
1078                                 (float)(ps.next()%(maxlen.Y*1))-(float)maxlen.Y/2,
1079                                 (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
1080                         );
1081
1082                         // Jump downward sometimes
1083                         if(!large_cave && ps.range(0,12) == 0)
1084                         {
1085                                 vec = v3f(
1086                                         (float)(ps.next()%(maxlen.X*1))-(float)maxlen.X/2,
1087                                         (float)(ps.next()%(maxlen.Y*2))-(float)maxlen.Y*2/2,
1088                                         (float)(ps.next()%(maxlen.Z*1))-(float)maxlen.Z/2
1089                                 );
1090                         }
1091
1092                         /*if(large_cave){
1093                                 v3f p = orp + vec;
1094                                 s16 h = find_ground_level_clever(vmanip,
1095                                                 v2s16(p.X, p.Z), ndef);
1096                                 route_y_min = h - rs/3;
1097                                 route_y_max = h + rs;
1098                         }*/
1099
1100                         vec += main_direction;
1101
1102                         v3f rp = orp + vec;
1103                         if(rp.X < 0)
1104                                 rp.X = 0;
1105                         else if(rp.X >= ar.X)
1106                                 rp.X = ar.X-1;
1107                         if(rp.Y < route_y_min)
1108                                 rp.Y = route_y_min;
1109                         else if(rp.Y >= route_y_max)
1110                                 rp.Y = route_y_max-1;
1111                         if(rp.Z < 0)
1112                                 rp.Z = 0;
1113                         else if(rp.Z >= ar.Z)
1114                                 rp.Z = ar.Z-1;
1115                         vec = rp - orp;
1116
1117                         for(float f=0; f<1.0; f+=1.0/vec.getLength())
1118                         {
1119                                 v3f fp = orp + vec * f;
1120                                 fp.X += 0.1*ps.range(-10,10);
1121                                 fp.Z += 0.1*ps.range(-10,10);
1122                                 v3s16 cp(fp.X, fp.Y, fp.Z);
1123
1124                                 s16 d0 = -rs/2;
1125                                 s16 d1 = d0 + rs;
1126                                 if(randomize_xz){
1127                                         d0 += ps.range(-1,1);
1128                                         d1 += ps.range(-1,1);
1129                                 }
1130                                 for(s16 z0=d0; z0<=d1; z0++)
1131                                 {
1132                                         s16 si = rs/2 - MYMAX(0, abs(z0)-rs/7-1);
1133                                         for(s16 x0=-si-ps.range(0,1); x0<=si-1+ps.range(0,1); x0++)
1134                                         {
1135                                                 s16 maxabsxz = MYMAX(abs(x0), abs(z0));
1136                                                 s16 si2 = rs/2 - MYMAX(0, maxabsxz-rs/7-1);
1137                                                 for(s16 y0=-si2; y0<=si2; y0++)
1138                                                 {
1139                                                         /*// Make better floors in small caves
1140                                                         if(y0 <= -rs/2 && rs<=7)
1141                                                                 continue;*/
1142                                                         if (cave.large_cave_is_flat) {
1143                                                                 // Make large caves not so tall
1144                                                                 if (rs > 7 && abs(y0) >= rs/3)
1145                                                                         continue;
1146                                                         }
1147
1148                                                         s16 z = cp.Z + z0;
1149                                                         s16 y = cp.Y + y0;
1150                                                         s16 x = cp.X + x0;
1151                                                         v3s16 p(x,y,z);
1152                                                         p += of;
1153
1154                                                         if(vm->m_area.contains(p) == false)
1155                                                                 continue;
1156
1157                                                         u32 i = vm->m_area.index(p);
1158
1159                                                         if(large_cave) {
1160                                                                 if (cave.flooded && full_node_min.Y < water_level &&
1161                                                                         full_node_max.Y > water_level) {
1162                                                                         if (p.Y <= water_level)
1163                                                                                 vm->m_data[i] = waternode;
1164                                                                         else
1165                                                                                 vm->m_data[i] = airnode;
1166                                                                 } else if (cave.flooded && full_node_max.Y < water_level) {
1167                                                                         if (p.Y < startp.Y - 2)
1168                                                                                 vm->m_data[i] = lavanode;
1169                                                                         else
1170                                                                                 vm->m_data[i] = airnode;
1171                                                                 } else {
1172                                                                         vm->m_data[i] = airnode;
1173                                                                 }
1174                                                         } else {
1175                                                                 // Don't replace air or water or lava or ignore
1176                                                                 if (vm->m_data[i].getContent() == CONTENT_IGNORE ||
1177                                                                         vm->m_data[i].getContent() == CONTENT_AIR ||
1178                                                                         vm->m_data[i].getContent() == c_water_source ||
1179                                                                         vm->m_data[i].getContent() == c_lava_source)
1180                                                                         continue;
1181
1182                                                                 vm->m_data[i] = airnode;
1183
1184                                                                 // Set tunnel flag
1185                                                                 vm->m_flags[i] |= VMANIP_FLAG_CAVE;
1186                                                         }
1187                                                 }
1188                                         }
1189                                 }
1190                         }
1191                         orp = rp;
1192                 }
1193         }
1194 }