src/mapgen/mapgen_carpathian.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2017-2019 vlapsley, Vaughan Lapsley <vlapsley@gmail.com>
   4 Copyright (C) 2017-2019 paramat
   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 <cmath>
  23 #include "mapgen.h"
  24 #include "voxel.h"
  25 #include "noise.h"
  26 #include "mapblock.h"
  27 #include "mapnode.h"
  28 #include "map.h"
  29 #include "content_sao.h"
  30 #include "nodedef.h"
  31 #include "voxelalgorithms.h"
  32 //#include "profiler.h" // For TimeTaker
  33 #include "settings.h" // For g_settings
  34 #include "emerge.h"
  35 #include "dungeongen.h"
  36 #include "cavegen.h"
  37 #include "mg_biome.h"
  38 #include "mg_ore.h"
  39 #include "mg_decoration.h"
  40 #include "mapgen_carpathian.h"
  41
  42
  43 FlagDesc flagdesc_mapgen_carpathian[] = {
  44         {"caverns", MGCARPATHIAN_CAVERNS},
  45         {"rivers",  MGCARPATHIAN_RIVERS},
  46         {NULL,      0}
  47 };
  48
  49
  50 ///////////////////////////////////////////////////////////////////////////////
  51
  52
  53 MapgenCarpathian::MapgenCarpathian(MapgenCarpathianParams *params, EmergeManager *emerge)
  54         : MapgenBasic(MAPGEN_CARPATHIAN, params, emerge)
  55 {
  56         base_level       = params->base_level;
  57         river_width      = params->river_width;
  58         river_depth      = params->river_depth;
  59         valley_width     = params->valley_width;
  60
  61         spflags            = params->spflags;
  62         cave_width         = params->cave_width;
  63         large_cave_depth   = params->large_cave_depth;
  64         small_cave_num_min = params->small_cave_num_min;
  65         small_cave_num_max = params->small_cave_num_max;
  66         large_cave_num_min = params->large_cave_num_min;
  67         large_cave_num_max = params->large_cave_num_max;
  68         large_cave_flooded = params->large_cave_flooded;
  69         cavern_limit       = params->cavern_limit;
  70         cavern_taper       = params->cavern_taper;
  71         cavern_threshold   = params->cavern_threshold;
  72         dungeon_ymin       = params->dungeon_ymin;
  73         dungeon_ymax       = params->dungeon_ymax;
  74
  75         grad_wl = 1 - water_level;
  76
  77         //// 2D Terrain noise
  78         noise_filler_depth  = new Noise(&params->np_filler_depth,  seed, csize.X, csize.Z);
  79         noise_height1       = new Noise(&params->np_height1,       seed, csize.X, csize.Z);
  80         noise_height2       = new Noise(&params->np_height2,       seed, csize.X, csize.Z);
  81         noise_height3       = new Noise(&params->np_height3,       seed, csize.X, csize.Z);
  82         noise_height4       = new Noise(&params->np_height4,       seed, csize.X, csize.Z);
  83         noise_hills_terrain = new Noise(&params->np_hills_terrain, seed, csize.X, csize.Z);
  84         noise_ridge_terrain = new Noise(&params->np_ridge_terrain, seed, csize.X, csize.Z);
  85         noise_step_terrain  = new Noise(&params->np_step_terrain,  seed, csize.X, csize.Z);
  86         noise_hills         = new Noise(&params->np_hills,         seed, csize.X, csize.Z);
  87         noise_ridge_mnt     = new Noise(&params->np_ridge_mnt,     seed, csize.X, csize.Z);
  88         noise_step_mnt      = new Noise(&params->np_step_mnt,      seed, csize.X, csize.Z);
  89         if (spflags & MGCARPATHIAN_RIVERS)
  90                 noise_rivers    = new Noise(&params->np_rivers,        seed, csize.X, csize.Z);
  91
  92         //// 3D terrain noise
  93         // 1 up 1 down overgeneration
  94         noise_mnt_var = new Noise(&params->np_mnt_var, seed, csize.X, csize.Y + 2, csize.Z);
  95
  96         //// Cave noise
  97         MapgenBasic::np_cave1  = params->np_cave1;
  98         MapgenBasic::np_cave2  = params->np_cave2;
  99         MapgenBasic::np_cavern = params->np_cavern;
 100         MapgenBasic::np_dungeons = params->np_dungeons;
 101 }
 102
 103
 104 MapgenCarpathian::~MapgenCarpathian()
 105 {
 106         delete noise_filler_depth;
 107         delete noise_height1;
 108         delete noise_height2;
 109         delete noise_height3;
 110         delete noise_height4;
 111         delete noise_hills_terrain;
 112         delete noise_ridge_terrain;
 113         delete noise_step_terrain;
 114         delete noise_hills;
 115         delete noise_ridge_mnt;
 116         delete noise_step_mnt;
 117         if (spflags & MGCARPATHIAN_RIVERS)
 118                 delete noise_rivers;
 119
 120         delete noise_mnt_var;
 121 }
 122
 123
 124 MapgenCarpathianParams::MapgenCarpathianParams():
 125         np_filler_depth  (0,   1,   v3f(128,  128,  128),  261,   3, 0.7,  2.0),
 126         np_height1       (0,   5,   v3f(251,  251,  251),  9613,  5, 0.5,  2.0),
 127         np_height2       (0,   5,   v3f(383,  383,  383),  1949,  5, 0.5,  2.0),
 128         np_height3       (0,   5,   v3f(509,  509,  509),  3211,  5, 0.5,  2.0),
 129         np_height4       (0,   5,   v3f(631,  631,  631),  1583,  5, 0.5,  2.0),
 130         np_hills_terrain (1,   1,   v3f(1301, 1301, 1301), 1692,  5, 0.5,  2.0),
 131         np_ridge_terrain (1,   1,   v3f(1889, 1889, 1889), 3568,  5, 0.5,  2.0),
 132         np_step_terrain  (1,   1,   v3f(1889, 1889, 1889), 4157,  5, 0.5,  2.0),
 133         np_hills         (0,   3,   v3f(257,  257,  257),  6604,  6, 0.5,  2.0),
 134         np_ridge_mnt     (0,   12,  v3f(743,  743,  743),  5520,  6, 0.7,  2.0),
 135         np_step_mnt      (0,   8,   v3f(509,  509,  509),  2590,  6, 0.6,  2.0),
 136         np_rivers        (0,   1,   v3f(1000, 1000, 1000), 85039, 5, 0.6,  2.0),
 137         np_mnt_var       (0,   1,   v3f(499,  499,  499),  2490,  5, 0.55, 2.0),
 138         np_cave1         (0,   12,  v3f(61,   61,   61),   52534, 3, 0.5,  2.0),
 139         np_cave2         (0,   12,  v3f(67,   67,   67),   10325, 3, 0.5,  2.0),
 140         np_cavern        (0,   1,   v3f(384,  128,  384),  723,   5, 0.63, 2.0),
 141         np_dungeons      (0.9, 0.5, v3f(500,  500,  500),  0,     2, 0.8,  2.0)
 142 {
 143 }
 144
 145
 146 void MapgenCarpathianParams::readParams(const Settings *settings)
 147 {
 148         settings->getFlagStrNoEx("mgcarpathian_spflags", spflags, flagdesc_mapgen_carpathian);
 149
 150         settings->getFloatNoEx("mgcarpathian_base_level",   base_level);
 151         settings->getFloatNoEx("mgcarpathian_river_width",  river_width);
 152         settings->getFloatNoEx("mgcarpathian_river_depth",  river_depth);
 153         settings->getFloatNoEx("mgcarpathian_valley_width", valley_width);
 154
 155         settings->getFloatNoEx("mgcarpathian_cave_width",         cave_width);
 156         settings->getS16NoEx("mgcarpathian_large_cave_depth",     large_cave_depth);
 157         settings->getU16NoEx("mgcarpathian_small_cave_num_min",   small_cave_num_min);
 158         settings->getU16NoEx("mgcarpathian_small_cave_num_max",   small_cave_num_max);
 159         settings->getU16NoEx("mgcarpathian_large_cave_num_min",   large_cave_num_min);
 160         settings->getU16NoEx("mgcarpathian_large_cave_num_max",   large_cave_num_max);
 161         settings->getFloatNoEx("mgcarpathian_large_cave_flooded", large_cave_flooded);
 162         settings->getS16NoEx("mgcarpathian_cavern_limit",         cavern_limit);
 163         settings->getS16NoEx("mgcarpathian_cavern_taper",         cavern_taper);
 164         settings->getFloatNoEx("mgcarpathian_cavern_threshold",   cavern_threshold);
 165         settings->getS16NoEx("mgcarpathian_dungeon_ymin",         dungeon_ymin);
 166         settings->getS16NoEx("mgcarpathian_dungeon_ymax",         dungeon_ymax);
 167
 168         settings->getNoiseParams("mgcarpathian_np_filler_depth",  np_filler_depth);
 169         settings->getNoiseParams("mgcarpathian_np_height1",       np_height1);
 170         settings->getNoiseParams("mgcarpathian_np_height2",       np_height2);
 171         settings->getNoiseParams("mgcarpathian_np_height3",       np_height3);
 172         settings->getNoiseParams("mgcarpathian_np_height4",       np_height4);
 173         settings->getNoiseParams("mgcarpathian_np_hills_terrain", np_hills_terrain);
 174         settings->getNoiseParams("mgcarpathian_np_ridge_terrain", np_ridge_terrain);
 175         settings->getNoiseParams("mgcarpathian_np_step_terrain",  np_step_terrain);
 176         settings->getNoiseParams("mgcarpathian_np_hills",         np_hills);
 177         settings->getNoiseParams("mgcarpathian_np_ridge_mnt",     np_ridge_mnt);
 178         settings->getNoiseParams("mgcarpathian_np_step_mnt",      np_step_mnt);
 179         settings->getNoiseParams("mgcarpathian_np_rivers",        np_rivers);
 180         settings->getNoiseParams("mgcarpathian_np_mnt_var",       np_mnt_var);
 181         settings->getNoiseParams("mgcarpathian_np_cave1",         np_cave1);
 182         settings->getNoiseParams("mgcarpathian_np_cave2",         np_cave2);
 183         settings->getNoiseParams("mgcarpathian_np_cavern",        np_cavern);
 184         settings->getNoiseParams("mgcarpathian_np_dungeons",      np_dungeons);
 185 }
 186
 187
 188 void MapgenCarpathianParams::writeParams(Settings *settings) const
 189 {
 190         settings->setFlagStr("mgcarpathian_spflags", spflags, flagdesc_mapgen_carpathian);
 191
 192         settings->setFloat("mgcarpathian_base_level",   base_level);
 193         settings->setFloat("mgcarpathian_river_width",  river_width);
 194         settings->setFloat("mgcarpathian_river_depth",  river_depth);
 195         settings->setFloat("mgcarpathian_valley_width", valley_width);
 196
 197         settings->setFloat("mgcarpathian_cave_width",         cave_width);
 198         settings->setS16("mgcarpathian_large_cave_depth",     large_cave_depth);
 199         settings->setU16("mgcarpathian_small_cave_num_min",   small_cave_num_min);
 200         settings->setU16("mgcarpathian_small_cave_num_max",   small_cave_num_max);
 201         settings->setU16("mgcarpathian_large_cave_num_min",   large_cave_num_min);
 202         settings->setU16("mgcarpathian_large_cave_num_max",   large_cave_num_max);
 203         settings->setFloat("mgcarpathian_large_cave_flooded", large_cave_flooded);
 204         settings->setS16("mgcarpathian_cavern_limit",         cavern_limit);
 205         settings->setS16("mgcarpathian_cavern_taper",         cavern_taper);
 206         settings->setFloat("mgcarpathian_cavern_threshold",   cavern_threshold);
 207         settings->setS16("mgcarpathian_dungeon_ymin",         dungeon_ymin);
 208         settings->setS16("mgcarpathian_dungeon_ymax",         dungeon_ymax);
 209
 210         settings->setNoiseParams("mgcarpathian_np_filler_depth",  np_filler_depth);
 211         settings->setNoiseParams("mgcarpathian_np_height1",       np_height1);
 212         settings->setNoiseParams("mgcarpathian_np_height2",       np_height2);
 213         settings->setNoiseParams("mgcarpathian_np_height3",       np_height3);
 214         settings->setNoiseParams("mgcarpathian_np_height4",       np_height4);
 215         settings->setNoiseParams("mgcarpathian_np_hills_terrain", np_hills_terrain);
 216         settings->setNoiseParams("mgcarpathian_np_ridge_terrain", np_ridge_terrain);
 217         settings->setNoiseParams("mgcarpathian_np_step_terrain",  np_step_terrain);
 218         settings->setNoiseParams("mgcarpathian_np_hills",         np_hills);
 219         settings->setNoiseParams("mgcarpathian_np_ridge_mnt",     np_ridge_mnt);
 220         settings->setNoiseParams("mgcarpathian_np_step_mnt",      np_step_mnt);
 221         settings->setNoiseParams("mgcarpathian_np_rivers",        np_rivers);
 222         settings->setNoiseParams("mgcarpathian_np_mnt_var",       np_mnt_var);
 223         settings->setNoiseParams("mgcarpathian_np_cave1",         np_cave1);
 224         settings->setNoiseParams("mgcarpathian_np_cave2",         np_cave2);
 225         settings->setNoiseParams("mgcarpathian_np_cavern",        np_cavern);
 226         settings->setNoiseParams("mgcarpathian_np_dungeons",      np_dungeons);
 227 }
 228
 229
 230 void MapgenCarpathianParams::setDefaultSettings(Settings *settings)
 231 {
 232         settings->setDefault("mgcarpathian_spflags", flagdesc_mapgen_carpathian,
 233                 MGCARPATHIAN_CAVERNS);
 234 }
 235
 236 ////////////////////////////////////////////////////////////////////////////////
 237
 238
 239 // Lerp function
 240 inline float MapgenCarpathian::getLerp(float noise1, float noise2, float mod)
 241 {
 242         return noise1 + mod * (noise2 - noise1);
 243 }
 244
 245 // Steps function
 246 float MapgenCarpathian::getSteps(float noise)
 247 {
 248         float w = 0.5f;
 249         float k = std::floor(noise / w);
 250         float f = (noise - k * w) / w;
 251         float s = std::fmin(2.f * f, 1.f);
 252         return (k + s) * w;
 253 }
 254
 255
 256 ////////////////////////////////////////////////////////////////////////////////
 257
 258
 259 void MapgenCarpathian::makeChunk(BlockMakeData *data)
 260 {
 261         // Pre-conditions
 262         assert(data->vmanip);
 263         assert(data->nodedef);
 264         assert(data->blockpos_requested.X >= data->blockpos_min.X &&
 265                         data->blockpos_requested.Y >= data->blockpos_min.Y &&
 266                         data->blockpos_requested.Z >= data->blockpos_min.Z);
 267         assert(data->blockpos_requested.X <= data->blockpos_max.X &&
 268                         data->blockpos_requested.Y <= data->blockpos_max.Y &&
 269                         data->blockpos_requested.Z <= data->blockpos_max.Z);
 270
 271         this->generating = true;
 272         this->vm = data->vmanip;
 273         this->ndef = data->nodedef;
 274
 275         v3s16 blockpos_min = data->blockpos_min;
 276         v3s16 blockpos_max = data->blockpos_max;
 277         node_min = blockpos_min * MAP_BLOCKSIZE;
 278         node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 279         full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
 280         full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
 281
 282         // Create a block-specific seed
 283         blockseed = getBlockSeed2(full_node_min, seed);
 284
 285         // Generate terrain
 286         s16 stone_surface_max_y = generateTerrain();
 287
 288         // Create heightmap
 289         updateHeightmap(node_min, node_max);
 290
 291         // Init biome generator, place biome-specific nodes, and build biomemap
 292         if (flags & MG_BIOMES) {
 293                 biomegen->calcBiomeNoise(node_min);
 294                 generateBiomes();
 295         }
 296
 297         // Generate tunnels, caverns and large randomwalk caves
 298         if (flags & MG_CAVES) {
 299                 // Generate tunnels first as caverns confuse them
 300                 generateCavesNoiseIntersection(stone_surface_max_y);
 301
 302                 // Generate caverns
 303                 bool near_cavern = false;
 304                 if (spflags & MGCARPATHIAN_CAVERNS)
 305                         near_cavern = generateCavernsNoise(stone_surface_max_y);
 306
 307                 // Generate large randomwalk caves
 308                 if (near_cavern)
 309                         // Disable large randomwalk caves in this mapchunk by setting
 310                         // 'large cave depth' to world base. Avoids excessive liquid in
 311                         // large caverns and floating blobs of overgenerated liquid.
 312                         generateCavesRandomWalk(stone_surface_max_y,
 313                                 -MAX_MAP_GENERATION_LIMIT);
 314                 else
 315                         generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
 316         }
 317
 318         // Generate the registered ores
 319         m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);
 320
 321         // Generate dungeons
 322         if (flags & MG_DUNGEONS)
 323                 generateDungeons(stone_surface_max_y);
 324
 325         // Generate the registered decorations
 326         if (flags & MG_DECORATIONS)
 327                 m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);
 328
 329         // Sprinkle some dust on top after everything else was generated
 330         if (flags & MG_BIOMES)
 331                 dustTopNodes();
 332
 333         // Update liquids
 334         updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);
 335
 336         // Calculate lighting
 337         if (flags & MG_LIGHT) {
 338                 calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
 339                                 full_node_min, full_node_max);
 340         }
 341
 342         this->generating = false;
 343 }
 344
 345
 346 ////////////////////////////////////////////////////////////////////////////////
 347
 348
 349 int MapgenCarpathian::getSpawnLevelAtPoint(v2s16 p)
 350 {
 351         // If rivers are enabled, first check if in a river channel
 352         if (spflags & MGCARPATHIAN_RIVERS) {
 353                 float river = std::fabs(NoisePerlin2D(&noise_rivers->np, p.X, p.Y, seed)) -
 354                         river_width;
 355                 if (river < 0.0f)
 356                         return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
 357         }
 358
 359         float height1 = NoisePerlin2D(&noise_height1->np, p.X, p.Y, seed);
 360         float height2 = NoisePerlin2D(&noise_height2->np, p.X, p.Y, seed);
 361         float height3 = NoisePerlin2D(&noise_height3->np, p.X, p.Y, seed);
 362         float height4 = NoisePerlin2D(&noise_height4->np, p.X, p.Y, seed);
 363
 364         float hterabs = std::fabs(NoisePerlin2D(&noise_hills_terrain->np, p.X, p.Y, seed));
 365         float n_hills = NoisePerlin2D(&noise_hills->np, p.X, p.Y, seed);
 366         float hill_mnt = hterabs * hterabs * hterabs * n_hills * n_hills;
 367
 368         float rterabs = std::fabs(NoisePerlin2D(&noise_ridge_terrain->np, p.X, p.Y, seed));
 369         float n_ridge_mnt = NoisePerlin2D(&noise_ridge_mnt->np, p.X, p.Y, seed);
 370         float ridge_mnt = rterabs * rterabs * rterabs * (1.0f - std::fabs(n_ridge_mnt));
 371
 372         float sterabs = std::fabs(NoisePerlin2D(&noise_step_terrain->np, p.X, p.Y, seed));
 373         float n_step_mnt = NoisePerlin2D(&noise_step_mnt->np, p.X, p.Y, seed);
 374         float step_mnt = sterabs * sterabs * sterabs * getSteps(n_step_mnt);
 375
 376         float valley = 1.0f;
 377         float river = 0.0f;
 378
 379         if ((spflags & MGCARPATHIAN_RIVERS) && node_max.Y >= water_level - 16) {
 380                 river = std::fabs(NoisePerlin2D(&noise_rivers->np, p.X, p.Y, seed)) - river_width;
 381                 if (river <= valley_width) {
 382                         // Within river valley
 383                         if (river < 0.0f) {
 384                                 // River channel
 385                                 valley = river;
 386                         } else {
 387                                 // Valley slopes.
 388                                 // 0 at river edge, 1 at valley edge.
 389                                 float riversc = river / valley_width;
 390                                 // Smoothstep
 391                                 valley = riversc * riversc * (3.0f - 2.0f * riversc);
 392                         }
 393                 }
 394         }
 395
 396         bool solid_below = false;
 397         u8 cons_non_solid = 0; // consecutive non-solid nodes
 398
 399         for (s16 y = water_level; y <= water_level + 32; y++) {
 400                 float mnt_var = NoisePerlin3D(&noise_mnt_var->np, p.X, y, p.Y, seed);
 401                 float hill1 = getLerp(height1, height2, mnt_var);
 402                 float hill2 = getLerp(height3, height4, mnt_var);
 403                 float hill3 = getLerp(height3, height2, mnt_var);
 404                 float hill4 = getLerp(height1, height4, mnt_var);
 405
 406                 float hilliness = std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
 407                 float hills = hill_mnt * hilliness;
 408                 float ridged_mountains = ridge_mnt * hilliness;
 409                 float step_mountains = step_mnt * hilliness;
 410
 411                 s32 grad = 1 - y;
 412
 413                 float mountains = hills + ridged_mountains + step_mountains;
 414                 float surface_level = base_level + mountains + grad;
 415
 416                 if ((spflags & MGCARPATHIAN_RIVERS) && river <= valley_width) {
 417                         if (valley < 0.0f) {
 418                                 // River channel
 419                                 surface_level = std::fmin(surface_level,
 420                                         water_level - std::sqrt(-valley) * river_depth);
 421                         } else if (surface_level > water_level) {
 422                                 // Valley slopes
 423                                 surface_level = water_level + (surface_level - water_level) * valley;
 424                         }
 425                 }
 426
 427                 if (y < surface_level) { //TODO '<=' fix from generateTerrain()
 428                         // solid node
 429                         solid_below = true;
 430                         cons_non_solid = 0;
 431                 } else {
 432                         // non-solid node
 433                         cons_non_solid++;
 434                         if (cons_non_solid == 3 && solid_below)
 435                                 return y - 1;
 436                 }
 437         }
 438
 439         return MAX_MAP_GENERATION_LIMIT; // No suitable spawn point found
 440 }
 441
 442
 443 ////////////////////////////////////////////////////////////////////////////////
 444
 445
 446 int MapgenCarpathian::generateTerrain()
 447 {
 448         MapNode mn_air(CONTENT_AIR);
 449         MapNode mn_stone(c_stone);
 450         MapNode mn_water(c_water_source);
 451
 452         // Calculate noise for terrain generation
 453         noise_height1->perlinMap2D(node_min.X, node_min.Z);
 454         noise_height2->perlinMap2D(node_min.X, node_min.Z);
 455         noise_height3->perlinMap2D(node_min.X, node_min.Z);
 456         noise_height4->perlinMap2D(node_min.X, node_min.Z);
 457         noise_hills_terrain->perlinMap2D(node_min.X, node_min.Z);
 458         noise_ridge_terrain->perlinMap2D(node_min.X, node_min.Z);
 459         noise_step_terrain->perlinMap2D(node_min.X, node_min.Z);
 460         noise_hills->perlinMap2D(node_min.X, node_min.Z);
 461         noise_ridge_mnt->perlinMap2D(node_min.X, node_min.Z);
 462         noise_step_mnt->perlinMap2D(node_min.X, node_min.Z);
 463         noise_mnt_var->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
 464
 465         if (spflags & MGCARPATHIAN_RIVERS)
 466                 noise_rivers->perlinMap2D(node_min.X, node_min.Z);
 467
 468         //// Place nodes
 469         const v3s16 &em = vm->m_area.getExtent();
 470         s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 471         u32 index2d = 0;
 472
 473         for (s16 z = node_min.Z; z <= node_max.Z; z++)
 474         for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
 475                 // Hill/Mountain height (hilliness)
 476                 float height1 = noise_height1->result[index2d];
 477                 float height2 = noise_height2->result[index2d];
 478                 float height3 = noise_height3->result[index2d];
 479                 float height4 = noise_height4->result[index2d];
 480
 481                 // Rolling hills
 482                 float hterabs = std::fabs(noise_hills_terrain->result[index2d]);
 483                 float n_hills = noise_hills->result[index2d];
 484                 float hill_mnt = hterabs * hterabs * hterabs * n_hills * n_hills;
 485
 486                 // Ridged mountains
 487                 float rterabs = std::fabs(noise_ridge_terrain->result[index2d]);
 488                 float n_ridge_mnt = noise_ridge_mnt->result[index2d];
 489                 float ridge_mnt = rterabs * rterabs * rterabs *
 490                         (1.0f - std::fabs(n_ridge_mnt));
 491
 492                 // Step (terraced) mountains
 493                 float sterabs = std::fabs(noise_step_terrain->result[index2d]);
 494                 float n_step_mnt = noise_step_mnt->result[index2d];
 495                 float step_mnt = sterabs * sterabs * sterabs * getSteps(n_step_mnt);
 496
 497                 // Rivers
 498                 float valley = 1.0f;
 499                 float river = 0.0f;
 500
 501                 if ((spflags & MGCARPATHIAN_RIVERS) && node_max.Y >= water_level - 16) {
 502                         river = std::fabs(noise_rivers->result[index2d]) - river_width;
 503                         if (river <= valley_width) {
 504                                 // Within river valley
 505                                 if (river < 0.0f) {
 506                                         // River channel
 507                                         valley = river;
 508                                 } else {
 509                                         // Valley slopes.
 510                                         // 0 at river edge, 1 at valley edge.
 511                                         float riversc = river / valley_width;
 512                                         // Smoothstep
 513                                         valley = riversc * riversc * (3.0f - 2.0f * riversc);
 514                                 }
 515                         }
 516                 }
 517
 518                 // Initialise 3D noise index and voxelmanip index to column base
 519                 u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
 520                 u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
 521
 522                 for (s16 y = node_min.Y - 1; y <= node_max.Y + 1;
 523                                 y++,
 524                                 index3d += ystride,
 525                                 VoxelArea::add_y(em, vi, 1)) {
 526                         if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
 527                                 continue;
 528
 529                         // Combine height noises and apply 3D variation
 530                         float mnt_var = noise_mnt_var->result[index3d];
 531                         float hill1 = getLerp(height1, height2, mnt_var);
 532                         float hill2 = getLerp(height3, height4, mnt_var);
 533                         float hill3 = getLerp(height3, height2, mnt_var);
 534                         float hill4 = getLerp(height1, height4, mnt_var);
 535
 536                         // 'hilliness' determines whether hills/mountains are
 537                         // small or large
 538                         float hilliness =
 539                                 std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
 540                         float hills = hill_mnt * hilliness;
 541                         float ridged_mountains = ridge_mnt * hilliness;
 542                         float step_mountains = step_mnt * hilliness;
 543
 544                         // Gradient & shallow seabed
 545                         s32 grad = (y < water_level) ? grad_wl + (water_level - y) * 3 :
 546                                 1 - y;
 547
 548                         // Final terrain level
 549                         float mountains = hills + ridged_mountains + step_mountains;
 550                         float surface_level = base_level + mountains + grad;
 551
 552                         // Rivers
 553                         if ((spflags & MGCARPATHIAN_RIVERS) && node_max.Y >= water_level - 16 &&
 554                                         river <= valley_width) {
 555                                 if (valley < 0.0f) {
 556                                         // River channel
 557                                         surface_level = std::fmin(surface_level,
 558                                                 water_level - std::sqrt(-valley) * river_depth);
 559                                 } else if (surface_level > water_level) {
 560                                         // Valley slopes
 561                                         surface_level = water_level + (surface_level - water_level) * valley;
 562                                 }
 563                         }
 564
 565                         if (y < surface_level) { //TODO '<='
 566                                 vm->m_data[vi] = mn_stone; // Stone
 567                                 if (y > stone_surface_max_y)
 568                                         stone_surface_max_y = y;
 569                         } else if (y <= water_level) {
 570                                 vm->m_data[vi] = mn_water; // Sea water
 571                         } else {
 572                                 vm->m_data[vi] = mn_air; // Air
 573                         }
 574                 }
 575         }
 576
 577         return stone_surface_max_y;
 578 }