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