mods/default/mapgen.lua

   1 --
   2 -- Aliases for map generator outputs
   3 --
   4
   5
   6 minetest.register_alias("mapgen_stone", "default:stone")
   7 minetest.register_alias("mapgen_dirt", "default:dirt")
   8 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")
   9 minetest.register_alias("mapgen_sand", "default:sand")
  10 minetest.register_alias("mapgen_water_source", "default:water_source")
  11 minetest.register_alias("mapgen_river_water_source", "default:river_water_source")
  12 minetest.register_alias("mapgen_lava_source", "default:lava_source")
  13 minetest.register_alias("mapgen_gravel", "default:gravel")
  14 minetest.register_alias("mapgen_desert_stone", "default:desert_stone")
  15 minetest.register_alias("mapgen_desert_sand", "default:desert_sand")
  16 minetest.register_alias("mapgen_dirt_with_snow", "default:dirt_with_snow")
  17 minetest.register_alias("mapgen_snowblock", "default:snowblock")
  18 minetest.register_alias("mapgen_snow", "default:snow")
  19 minetest.register_alias("mapgen_ice", "default:ice")
  20
  21 minetest.register_alias("mapgen_tree", "default:tree")
  22 minetest.register_alias("mapgen_leaves", "default:leaves")
  23 minetest.register_alias("mapgen_apple", "default:apple")
  24 minetest.register_alias("mapgen_jungletree", "default:jungletree")
  25 minetest.register_alias("mapgen_jungleleaves", "default:jungleleaves")
  26 minetest.register_alias("mapgen_junglegrass", "default:junglegrass")
  27 minetest.register_alias("mapgen_pinetree", "default:pinetree")
  28 minetest.register_alias("mapgen_pine_needles", "default:pine_needles")
  29
  30 minetest.register_alias("mapgen_cobble", "default:cobble")
  31 minetest.register_alias("mapgen_stair_cobble", "stairs:stair_cobble")
  32 minetest.register_alias("mapgen_mossycobble", "default:mossycobble")
  33 minetest.register_alias("mapgen_sandstonebrick", "default:sandstonebrick")
  34 minetest.register_alias("mapgen_stair_sandstonebrick", "stairs:stair_sandstonebrick")
  35
  36
  37 --
  38 -- Register ores
  39 --
  40
  41
  42 -- Blob ore first to avoid other ores inside blobs
  43
  44 function default.register_ores()
  45         minetest.register_ore({
  46                 ore_type         = "blob",
  47                 ore              = "default:clay",
  48                 wherein          = {"default:sand"},
  49                 clust_scarcity   = 24*24*24,
  50                 clust_size       = 7,
  51                 y_min            = -15,
  52                 y_max            = 0,
  53                 noise_threshhold = 0,
  54                 noise_params     = {
  55                         offset=0.35,
  56                         scale=0.2,
  57                         spread={x=5, y=5, z=5},
  58                         seed=-316,
  59                         octaves=1,
  60                         persist=0.5
  61                 },
  62         })
  63
  64         minetest.register_ore({
  65                 ore_type         = "blob",
  66                 ore              = "default:sand",
  67                 wherein          = {"default:stone"},
  68                 clust_scarcity   = 24*24*24,
  69                 clust_size       = 7,
  70                 y_min            = -63,
  71                 y_max            = 4,
  72                 noise_threshhold = 0,
  73                 noise_params     = {
  74                         offset=0.35,
  75                         scale=0.2,
  76                         spread={x=5, y=5, z=5},
  77                         seed=2316,
  78                         octaves=1,
  79                         persist=0.5
  80                 },
  81         })
  82
  83         minetest.register_ore({
  84                 ore_type         = "blob",
  85                 ore              = "default:dirt",
  86                 wherein          = {"default:stone"},
  87                 clust_scarcity   = 24*24*24,
  88                 clust_size       = 7,
  89                 y_min            = -63,
  90                 y_max            = 31000,
  91                 noise_threshhold = 0,
  92                 noise_params     = {
  93                         offset=0.35,
  94                         scale=0.2,
  95                         spread={x=5, y=5, z=5},
  96                         seed=17676,
  97                         octaves=1,
  98                         persist=0.5
  99                 },
 100         })
 101
 102         minetest.register_ore({
 103                 ore_type         = "blob",
 104                 ore              = "default:gravel",
 105                 wherein          = {"default:stone"},
 106                 clust_scarcity   = 24*24*24,
 107                 clust_size       = 7,
 108                 y_min            = -31000,
 109                 y_max            = 31000,
 110                 noise_threshhold = 0,
 111                 noise_params     = {
 112                         offset=0.35,
 113                         scale=0.2,
 114                         spread={x=5, y=5, z=5},
 115                         seed=766,
 116                         octaves=1,
 117                         persist=0.5
 118                 },
 119         })
 120
 121         minetest.register_ore({
 122                 ore_type       = "scatter",
 123                 ore            = "default:stone_with_coal",
 124                 wherein        = "default:stone",
 125                 clust_scarcity = 8*8*8,
 126                 clust_num_ores = 8,
 127                 clust_size     = 3,
 128                 y_min          = -31000,
 129                 y_max          = 64,
 130         })
 131
 132         minetest.register_ore({
 133                 ore_type       = "scatter",
 134                 ore            = "default:stone_with_coal",
 135                 wherein        = "default:stone",
 136                 clust_scarcity = 24*24*24,
 137                 clust_num_ores = 27,
 138                 clust_size     = 6,
 139                 y_min          = -31000,
 140                 y_max          = 0,
 141         })
 142
 143         minetest.register_ore({
 144                 ore_type       = "scatter",
 145                 ore            = "default:stone_with_iron",
 146                 wherein        = "default:stone",
 147                 clust_scarcity = 12*12*12,
 148                 clust_num_ores = 3,
 149                 clust_size     = 2,
 150                 y_min          = -15,
 151                 y_max          = 2,
 152         })
 153
 154         minetest.register_ore({
 155                 ore_type       = "scatter",
 156                 ore            = "default:stone_with_iron",
 157                 wherein        = "default:stone",
 158                 clust_scarcity = 9*9*9,
 159                 clust_num_ores = 5,
 160                 clust_size     = 3,
 161                 y_min          = -63,
 162                 y_max          = -16,
 163         })
 164
 165         minetest.register_ore({
 166                 ore_type       = "scatter",
 167                 ore            = "default:stone_with_iron",
 168                 wherein        = "default:stone",
 169                 clust_scarcity = 7*7*7,
 170                 clust_num_ores = 5,
 171                 clust_size     = 3,
 172                 y_min          = -31000,
 173                 y_max          = -64,
 174         })
 175
 176         minetest.register_ore({
 177                 ore_type       = "scatter",
 178                 ore            = "default:stone_with_iron",
 179                 wherein        = "default:stone",
 180                 clust_scarcity = 24*24*24,
 181                 clust_num_ores = 27,
 182                 clust_size     = 6,
 183                 y_min          = -31000,
 184                 y_max          = -64,
 185         })
 186
 187         minetest.register_ore({
 188                 ore_type       = "scatter",
 189                 ore            = "default:stone_with_mese",
 190                 wherein        = "default:stone",
 191                 clust_scarcity = 18*18*18,
 192                 clust_num_ores = 3,
 193                 clust_size     = 2,
 194                 y_min          = -255,
 195                 y_max          = -64,
 196         })
 197
 198         minetest.register_ore({
 199                 ore_type       = "scatter",
 200                 ore            = "default:stone_with_mese",
 201                 wherein        = "default:stone",
 202                 clust_scarcity = 14*14*14,
 203                 clust_num_ores = 5,
 204                 clust_size     = 3,
 205                 y_min          = -31000,
 206                 y_max          = -256,
 207         })
 208
 209         minetest.register_ore({
 210                 ore_type       = "scatter",
 211                 ore            = "default:mese",
 212                 wherein        = "default:stone",
 213                 clust_scarcity = 36*36*36,
 214                 clust_num_ores = 3,
 215                 clust_size     = 2,
 216                 y_min          = -31000,
 217                 y_max          = -1024,
 218         })
 219
 220         minetest.register_ore({
 221                 ore_type       = "scatter",
 222                 ore            = "default:stone_with_gold",
 223                 wherein        = "default:stone",
 224                 clust_scarcity = 15*15*15,
 225                 clust_num_ores = 3,
 226                 clust_size     = 2,
 227                 y_min          = -255,
 228                 y_max          = -64,
 229         })
 230
 231         minetest.register_ore({
 232                 ore_type       = "scatter",
 233                 ore            = "default:stone_with_gold",
 234                 wherein        = "default:stone",
 235                 clust_scarcity = 13*13*13,
 236                 clust_num_ores = 5,
 237                 clust_size     = 3,
 238                 y_min          = -31000,
 239                 y_max          = -256,
 240         })
 241
 242         minetest.register_ore({
 243                 ore_type       = "scatter",
 244                 ore            = "default:stone_with_diamond",
 245                 wherein        = "default:stone",
 246                 clust_scarcity = 17*17*17,
 247                 clust_num_ores = 4,
 248                 clust_size     = 3,
 249                 y_min          = -255,
 250                 y_max          = -128,
 251         })
 252
 253         minetest.register_ore({
 254                 ore_type       = "scatter",
 255                 ore            = "default:stone_with_diamond",
 256                 wherein        = "default:stone",
 257                 clust_scarcity = 15*15*15,
 258                 clust_num_ores = 4,
 259                 clust_size     = 3,
 260                 y_min          = -31000,
 261                 y_max          = -256,
 262         })
 263
 264         minetest.register_ore({
 265                 ore_type       = "scatter",
 266                 ore            = "default:stone_with_copper",
 267                 wherein        = "default:stone",
 268                 clust_scarcity = 12*12*12,
 269                 clust_num_ores = 4,
 270                 clust_size     = 3,
 271                 y_min          = -63,
 272                 y_max          = -16,
 273         })
 274
 275         minetest.register_ore({
 276                 ore_type       = "scatter",
 277                 ore            = "default:stone_with_copper",
 278                 wherein        = "default:stone",
 279                 clust_scarcity = 9*9*9,
 280                 clust_num_ores = 5,
 281                 clust_size     = 3,
 282                 y_min          = -31000,
 283                 y_max          = -64,
 284         })
 285 end
 286
 287
 288 --
 289 -- Register biomes
 290 --
 291
 292
 293 function default.register_biomes()
 294         minetest.clear_registered_biomes()
 295
 296         minetest.register_biome({
 297                 name = "default:grassland",
 298                 --node_dust = "",
 299                 node_top = "default:dirt_with_grass",
 300                 depth_top = 1,
 301                 node_filler = "default:dirt",
 302                 depth_filler = 1,
 303                 --node_stone = "",
 304                 --node_water_top = "",
 305                 --depth_water_top = ,
 306                 --node_water = "",
 307                 y_min = 5,
 308                 y_max = 31000,
 309                 heat_point = 50,
 310                 humidity_point = 50,
 311         })
 312
 313         minetest.register_biome({
 314                 name = "default:grassland_ocean",
 315                 --node_dust = "",
 316                 node_top = "default:sand",
 317                 depth_top = 1,
 318                 node_filler = "default:sand",
 319                 depth_filler = 2,
 320                 --node_stone = "",
 321                 --node_water_top = "",
 322                 --depth_water_top = ,
 323                 --node_water = "",
 324                 y_min = -31000,
 325                 y_max = 4,
 326                 heat_point = 50,
 327                 humidity_point = 50,
 328         })
 329 end
 330
 331
 332 --
 333 -- Register mgv6 decorations
 334 --
 335
 336
 337 function default.register_mgv6_decorations()
 338
 339         -- Papyrus
 340
 341         minetest.register_decoration({
 342                 deco_type = "simple",
 343                 place_on = {"default:dirt_with_grass"},
 344                 sidelen = 8,
 345                 noise_params = {
 346                         offset = -0.3,
 347                         scale = 0.7,
 348                         spread = {x=100, y=100, z=100},
 349                         seed = 354,
 350                         octaves = 3,
 351                         persist = 0.7
 352                 },
 353                 y_min = 1,
 354                 y_max = 1,
 355                 decoration = "default:papyrus",
 356                 height = 2,
 357                 height_max = 4,
 358                 spawn_by = "default:water_source",
 359                 num_spawn_by = 1,
 360         })
 361
 362         -- Cacti
 363
 364         minetest.register_decoration({
 365                 deco_type = "simple",
 366                 place_on = {"default:desert_sand"},
 367                 sidelen = 16,
 368                 noise_params = {
 369                         offset = -0.012,
 370                         scale = 0.024,
 371                         spread = {x=100, y=100, z=100},
 372                         seed = 230,
 373                         octaves = 3,
 374                         persist = 0.6
 375                 },
 376                 y_min = 1,
 377                 y_max = 30,
 378                 decoration = "default:cactus",
 379                 height = 3,
 380                 height_max = 4,
 381         })
 382
 383         -- Grasses
 384
 385         for length = 1, 5 do
 386                 minetest.register_decoration({
 387                         deco_type = "simple",
 388                         place_on = {"default:dirt_with_grass"},
 389                         sidelen = 16,
 390                         noise_params = {
 391                                 offset = 0,
 392                                 scale = 0.007,
 393                                 spread = {x=100, y=100, z=100},
 394                                 seed = 329,
 395                                 octaves = 3,
 396                                 persist = 0.6
 397                         },
 398                         y_min = 1,
 399                         y_max = 30,
 400                         decoration = "default:grass_"..length,
 401                 })
 402         end
 403
 404         -- Dry shrubs
 405
 406         minetest.register_decoration({
 407                 deco_type = "simple",
 408                 place_on = {"default:desert_sand", "default:dirt_with_snow"},
 409                 sidelen = 16,
 410                 noise_params = {
 411                         offset = 0,
 412                         scale = 0.035,
 413                         spread = {x=100, y=100, z=100},
 414                         seed = 329,
 415                         octaves = 3,
 416                         persist = 0.6
 417                 },
 418                 y_min = 1,
 419                 y_max = 30,
 420                 decoration = "default:dry_shrub",
 421         })
 422 end
 423
 424
 425 --
 426 -- Register decorations
 427 --
 428
 429
 430 function default.register_decorations()
 431
 432         -- Flowers
 433
 434         minetest.register_decoration({
 435                 deco_type = "simple",
 436                 place_on = {"default:dirt_with_grass"},
 437                 sidelen = 16,
 438                 noise_params = {
 439                         offset = -0.02,
 440                         scale = 0.03,
 441                         spread = {x=200, y=200, z=200},
 442                         seed = 436,
 443                         octaves = 3,
 444                         persist = 0.6
 445                 },
 446                 biomes = {"default:grassland"},
 447                 y_min = -31000,
 448                 y_max = 31000,
 449                 decoration = "flowers:rose",
 450         })
 451
 452         minetest.register_decoration({
 453                 deco_type = "simple",
 454                 place_on = {"default:dirt_with_grass"},
 455                 sidelen = 16,
 456                 noise_params = {
 457                         offset = -0.02,
 458                         scale = 0.03,
 459                         spread = {x=200, y=200, z=200},
 460                         seed = 19822,
 461                         octaves = 3,
 462                         persist = 0.6
 463                 },
 464                 biomes = {"default:grassland"},
 465                 y_min = 33,
 466                 y_max = 31000,
 467                 decoration = "flowers:tulip",
 468         })
 469
 470         minetest.register_decoration({
 471                 deco_type = "simple",
 472                 place_on = {"default:dirt_with_grass"},
 473                 sidelen = 16,
 474                 noise_params = {
 475                         offset = -0.02,
 476                         scale = 0.03,
 477                         spread = {x=200, y=200, z=200},
 478                         seed = 1220999,
 479                         octaves = 3,
 480                         persist = 0.6
 481                 },
 482                 biomes = {"default:grassland"},
 483                 y_min = -31000,
 484                 y_max = 31000,
 485                 decoration = "flowers:dandelion_yellow",
 486         })
 487
 488         minetest.register_decoration({
 489                 deco_type = "simple",
 490                 place_on = {"default:dirt_with_grass"},
 491                 sidelen = 16,
 492                 noise_params = {
 493                         offset = -0.02,
 494                         scale = 0.03,
 495                         spread = {x=200, y=200, z=200},
 496                         seed = 36662,
 497                         octaves = 3,
 498                         persist = 0.6
 499                 },
 500                 biomes = {"default:grassland"},
 501                 y_min = -31000,
 502                 y_max = 31000,
 503                 decoration = "flowers:geranium",
 504         })
 505
 506         minetest.register_decoration({
 507                 deco_type = "simple",
 508                 place_on = {"default:dirt_with_grass"},
 509                 sidelen = 16,
 510                 noise_params = {
 511                         offset = -0.02,
 512                         scale = 0.03,
 513                         spread = {x=200, y=200, z=200},
 514                         seed = 1133,
 515                         octaves = 3,
 516                         persist = 0.6
 517                 },
 518                 biomes = {"default:grassland"},
 519                 y_min = -31000,
 520                 y_max = 31000,
 521                 decoration = "flowers:viola",
 522         })
 523
 524         minetest.register_decoration({
 525                 deco_type = "simple",
 526                 place_on = {"default:dirt_with_grass"},
 527                 sidelen = 16,
 528                 noise_params = {
 529                         offset = -0.02,
 530                         scale = 0.03,
 531                         spread = {x=200, y=200, z=200},
 532                         seed = 73133,
 533                         octaves = 3,
 534                         persist = 0.6
 535                 },
 536                 biomes = {"default:grassland"},
 537                 y_min = -31000,
 538                 y_max = 31000,
 539                 decoration = "flowers:dandelion_white",
 540         })
 541
 542         -- Grasses
 543
 544         minetest.register_decoration({
 545                 deco_type = "simple",
 546                 place_on = {"default:dirt_with_grass"},
 547                 sidelen = 16,
 548                 noise_params = {
 549                         offset = 0.04,
 550                         scale = 0.04,
 551                         spread = {x=200, y=200, z=200},
 552                         seed = 66440,
 553                         octaves = 3,
 554                         persist = 0.6
 555                 },
 556                 biomes = {"default:grassland"},
 557                 y_min = -31000,
 558                 y_max = 31000,
 559                 decoration = "default:grass_1",
 560         })
 561
 562         minetest.register_decoration({
 563                 deco_type = "simple",
 564                 place_on = {"default:dirt_with_grass"},
 565                 sidelen = 16,
 566                 noise_params = {
 567                         offset = 0.02,
 568                         scale = 0.06,
 569                         spread = {x=200, y=200, z=200},
 570                         seed = 66440,
 571                         octaves = 3,
 572                         persist = 0.6
 573                 },
 574                 biomes = {"default:grassland"},
 575                 y_min = -31000,
 576                 y_max = 31000,
 577                 decoration = "default:grass_2",
 578         })
 579
 580         minetest.register_decoration({
 581                 deco_type = "simple",
 582                 place_on = {"default:dirt_with_grass"},
 583                 sidelen = 16,
 584                 noise_params = {
 585                         offset = 0,
 586                         scale = 0.08,
 587                         spread = {x=200, y=200, z=200},
 588                         seed = 66440,
 589                         octaves = 3,
 590                         persist = 0.6
 591                 },
 592                 biomes = {"default:grassland"},
 593                 y_min = -31000,
 594                 y_max = 31000,
 595                 decoration = "default:grass_3",
 596         })
 597
 598         minetest.register_decoration({
 599                 deco_type = "simple",
 600                 place_on = {"default:dirt_with_grass"},
 601                 sidelen = 16,
 602                 noise_params = {
 603                         offset = -0.02,
 604                         scale = 0.10,
 605                         spread = {x=200, y=200, z=200},
 606                         seed = 66440,
 607                         octaves = 3,
 608                         persist = 0.6
 609                 },
 610                 biomes = {"default:grassland"},
 611                 y_min = -31000,
 612                 y_max = 31000,
 613                 decoration = "default:grass_4",
 614         })
 615
 616         minetest.register_decoration({
 617                 deco_type = "simple",
 618                 place_on = {"default:dirt_with_grass"},
 619                 sidelen = 16,
 620                 noise_params = {
 621                         offset = -0.04,
 622                         scale = 0.12,
 623                         spread = {x=200, y=200, z=200},
 624                         seed = 66440,
 625                         octaves = 3,
 626                         persist = 0.6
 627                 },
 628                 biomes = {"default:grassland"},
 629                 y_min = -31000,
 630                 y_max = 31000,
 631                 decoration = "default:grass_5",
 632         })
 633 end
 634
 635
 636 --
 637 -- Detect mapgen to select functions
 638 --
 639
 640
 641 -- Mods using singlenode mapgen can call these functions to enable
 642 -- the use of minetest.generate_ores or minetest.generate_decorations
 643
 644 local mg_params = minetest.get_mapgen_params()
 645 if mg_params.mgname == "v6" then
 646         default.register_ores()
 647         default.register_mgv6_decorations()
 648 elseif mg_params.mgname ~= "singlenode" then
 649         default.register_ores()
 650         default.register_biomes()
 651         default.register_decorations()
 652 end
 653
 654
 655 --
 656 -- Generate nyan cats in all mapgens
 657 --
 658
 659
 660 -- facedir: 0/1/2/3 (head node facedir value)
 661 -- length: length of rainbow tail
 662 function default.make_nyancat(pos, facedir, length)
 663         local tailvec = {x=0, y=0, z=0}
 664         if facedir == 0 then
 665                 tailvec.z = 1
 666         elseif facedir == 1 then
 667                 tailvec.x = 1
 668         elseif facedir == 2 then
 669                 tailvec.z = -1
 670         elseif facedir == 3 then
 671                 tailvec.x = -1
 672         else
 673                 --print("default.make_nyancat(): Invalid facedir: "+dump(facedir))
 674                 facedir = 0
 675                 tailvec.z = 1
 676         end
 677         local p = {x=pos.x, y=pos.y, z=pos.z}
 678         minetest.set_node(p, {name="default:nyancat", param2=facedir})
 679         for i=1,length do
 680                 p.x = p.x + tailvec.x
 681                 p.z = p.z + tailvec.z
 682                 minetest.set_node(p, {name="default:nyancat_rainbow", param2=facedir})
 683         end
 684 end
 685
 686
 687 function default.generate_nyancats(minp, maxp, seed)
 688         local height_min = -31000
 689         local height_max = -32
 690         if maxp.y < height_min or minp.y > height_max then
 691                 return
 692         end
 693         local y_min = math.max(minp.y, height_min)
 694         local y_max = math.min(maxp.y, height_max)
 695         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
 696         local pr = PseudoRandom(seed + 9324342)
 697         local max_num_nyancats = math.floor(volume / (16*16*16))
 698         for i=1,max_num_nyancats do
 699                 if pr:next(0, 1000) == 0 then
 700                         local x0 = pr:next(minp.x, maxp.x)
 701                         local y0 = pr:next(minp.y, maxp.y)
 702                         local z0 = pr:next(minp.z, maxp.z)
 703                         local p0 = {x=x0, y=y0, z=z0}
 704                         default.make_nyancat(p0, pr:next(0,3), pr:next(3,15))
 705                 end
 706         end
 707 end
 708
 709
 710 minetest.register_on_generated(default.generate_nyancats)
 711
 712
 713 --
 714 -- Deprecated ore generation code
 715 --
 716
 717
 718 function default.generate_ore(name, wherein, minp, maxp, seed,
 719                 chunks_per_volume, chunk_size, ore_per_chunk, height_min, height_max)
 720         minetest.log('action', "WARNING: default.generate_ore is deprecated")
 721
 722         if maxp.y < height_min or minp.y > height_max then
 723                 return
 724         end
 725         local y_min = math.max(minp.y, height_min)
 726         local y_max = math.min(maxp.y, height_max)
 727         if chunk_size >= y_max - y_min + 1 then
 728                 return
 729         end
 730         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
 731         local pr = PseudoRandom(seed)
 732         local num_chunks = math.floor(chunks_per_volume * volume)
 733         local inverse_chance = math.floor(chunk_size*chunk_size*chunk_size / ore_per_chunk)
 734         --print("generate_ore num_chunks: "..dump(num_chunks))
 735         for i=1,num_chunks do
 736                 local y0 = pr:next(y_min, y_max-chunk_size+1)
 737                 if y0 >= height_min and y0 <= height_max then
 738                         local x0 = pr:next(minp.x, maxp.x-chunk_size+1)
 739                         local z0 = pr:next(minp.z, maxp.z-chunk_size+1)
 740                         local p0 = {x=x0, y=y0, z=z0}
 741                         for x1=0,chunk_size-1 do
 742                         for y1=0,chunk_size-1 do
 743                         for z1=0,chunk_size-1 do
 744                                 if pr:next(1,inverse_chance) == 1 then
 745                                         local x2 = x0+x1
 746                                         local y2 = y0+y1
 747                                         local z2 = z0+z1
 748                                         local p2 = {x=x2, y=y2, z=z2}
 749                                         if minetest.get_node(p2).name == wherein then
 750                                                 minetest.set_node(p2, {name=name})
 751                                         end
 752                                 end
 753                         end
 754                         end
 755                         end
 756                 end
 757         end
 758         --print("generate_ore done")
 759 end
 760