mods/default/mapgen.lua

   1 -- minetest/default/mapgen.lua
   2
   3 --
   4 -- Aliases for map generator outputs
   5 --
   6
   7 minetest.register_alias("mapgen_air", "air")
   8 minetest.register_alias("mapgen_stone", "default:stone")
   9 minetest.register_alias("mapgen_tree", "default:tree")
  10 minetest.register_alias("mapgen_leaves", "default:leaves")
  11 minetest.register_alias("mapgen_jungletree", "default:jungletree")
  12 minetest.register_alias("mapgen_jungleleaves", "default:jungleleaves")
  13 minetest.register_alias("mapgen_apple", "default:apple")
  14 minetest.register_alias("mapgen_water_source", "default:water_source")
  15 minetest.register_alias("mapgen_dirt", "default:dirt")
  16 minetest.register_alias("mapgen_sand", "default:sand")
  17 minetest.register_alias("mapgen_gravel", "default:gravel")
  18 minetest.register_alias("mapgen_clay", "default:clay")
  19 minetest.register_alias("mapgen_lava_source", "default:lava_source")
  20 minetest.register_alias("mapgen_cobble", "default:cobble")
  21 minetest.register_alias("mapgen_mossycobble", "default:mossycobble")
  22 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")
  23 minetest.register_alias("mapgen_junglegrass", "default:junglegrass")
  24 minetest.register_alias("mapgen_stone_with_coal", "default:stone_with_coal")
  25 minetest.register_alias("mapgen_stone_with_iron", "default:stone_with_iron")
  26 minetest.register_alias("mapgen_mese", "default:mese")
  27 minetest.register_alias("mapgen_desert_sand", "default:desert_sand")
  28 minetest.register_alias("mapgen_desert_stone", "default:desert_stone")
  29
  30 --
  31 -- Ore generation
  32 --
  33
  34 function default.generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume, chunk_size, ore_per_chunk, height_min, height_max)
  35         if maxp.y < height_min or minp.y > height_max then
  36                 return
  37         end
  38         local y_min = math.max(minp.y, height_min)
  39         local y_max = math.min(maxp.y, height_max)
  40         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
  41         local pr = PseudoRandom(seed)
  42         local num_chunks = math.floor(chunks_per_volume * volume)
  43         local inverse_chance = math.floor(chunk_size*chunk_size*chunk_size / ore_per_chunk)
  44         --print("generate_ore num_chunks: "..dump(num_chunks))
  45         for i=1,num_chunks do
  46                 local y0 = pr:next(y_min, y_max-chunk_size+1)
  47                 if y0 >= height_min and y0 <= height_max then
  48                         local x0 = pr:next(minp.x, maxp.x-chunk_size+1)
  49                         local z0 = pr:next(minp.z, maxp.z-chunk_size+1)
  50                         local p0 = {x=x0, y=y0, z=z0}
  51                         for x1=0,chunk_size-1 do
  52                         for y1=0,chunk_size-1 do
  53                         for z1=0,chunk_size-1 do
  54                                 if pr:next(1,inverse_chance) == 1 then
  55                                         local x2 = x0+x1
  56                                         local y2 = y0+y1
  57                                         local z2 = z0+z1
  58                                         local p2 = {x=x2, y=y2, z=z2}
  59                                         if minetest.env:get_node(p2).name == wherein then
  60                                                 minetest.env:set_node(p2, {name=name})
  61                                         end
  62                                 end
  63                         end
  64                         end
  65                         end
  66                 end
  67         end
  68         --print("generate_ore done")
  69 end
  70
  71 function default.make_papyrus(pos, size)
  72         for y=0,size-1 do
  73                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  74                 local nn = minetest.env:get_node(p).name
  75                 if minetest.registered_nodes[nn] and
  76                         minetest.registered_nodes[nn].buildable_to then
  77                         minetest.env:set_node(p, {name="default:papyrus"})
  78                 else
  79                         return
  80                 end
  81         end
  82 end
  83
  84 function default.make_cactus(pos, size)
  85         for y=0,size-1 do
  86                 local p = {x=pos.x, y=pos.y+y, z=pos.z}
  87                 local nn = minetest.env:get_node(p).name
  88                 if minetest.registered_nodes[nn] and
  89                         minetest.registered_nodes[nn].buildable_to then
  90                         minetest.env:set_node(p, {name="default:cactus"})
  91                 else
  92                         return
  93                 end
  94         end
  95 end
  96
  97 -- facedir: 0/1/2/3 (head node facedir value)
  98 -- length: length of rainbow tail
  99 function default.make_nyancat(pos, facedir, length)
 100         local tailvec = {x=0, y=0, z=0}
 101         if facedir == 0 then
 102                 tailvec.z = 1
 103         elseif facedir == 1 then
 104                 tailvec.x = 1
 105         elseif facedir == 2 then
 106                 tailvec.z = -1
 107         elseif facedir == 3 then
 108                 tailvec.x = -1
 109         else
 110                 print("default.make_nyancat(): Invalid facedir: "+dump(facedir))
 111                 facedir = 0
 112                 tailvec.z = 1
 113         end
 114         local p = {x=pos.x, y=pos.y, z=pos.z}
 115         minetest.env:set_node(p, {name="default:nyancat", param2=facedir})
 116         for i=1,length do
 117                 p.x = p.x + tailvec.x
 118                 p.z = p.z + tailvec.z
 119                 minetest.env:set_node(p, {name="default:nyancat_rainbow"})
 120         end
 121 end
 122
 123 function generate_nyancats(seed, minp, maxp)
 124         local height_min = -31000
 125         local height_max = -32
 126         if maxp.y < height_min or minp.y > height_max then
 127                 return
 128         end
 129         local y_min = math.max(minp.y, height_min)
 130         local y_max = math.min(maxp.y, height_max)
 131         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
 132         local pr = PseudoRandom(seed + 9324342)
 133         local max_num_nyancats = math.floor(volume / (16*16*16))
 134         for i=1,max_num_nyancats do
 135                 if pr:next(0, 1000) == 0 then
 136                         local x0 = pr:next(minp.x, maxp.x)
 137                         local y0 = pr:next(minp.y, maxp.y)
 138                         local z0 = pr:next(minp.z, maxp.z)
 139                         local p0 = {x=x0, y=y0, z=z0}
 140                         default.make_nyancat(p0, pr:next(0,3), pr:next(3,15))
 141                 end
 142         end
 143 end
 144
 145 minetest.register_on_generated(function(minp, maxp, seed)
 146         -- Generate regular ores
 147         default.generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed+0, 1/8/8/8,    3, 8, -31000,  64)
 148         default.generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+1, 1/12/12/12, 2, 3,    -15,   2)
 149         default.generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+2, 1/9/9/9,    3, 5,    -63, -16)
 150         default.generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+3, 1/7/7/7,    3, 5, -31000, -64)
 151
 152         default.generate_ore("default:stone_with_mese", "default:stone", minp, maxp, seed+4, 1/16/16/16, 2, 3,   -127,  -64)
 153         default.generate_ore("default:stone_with_mese", "default:stone", minp, maxp, seed+5, 1/9/9/9,    3, 5, -31000, -128)
 154         default.generate_ore("default:mese",            "default:stone", minp, maxp, seed+8, 1/16/16/16, 2, 3, -31000,-1024)
 155
 156         default.generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed+7, 1/24/24/24, 6,27, -31000,  0)
 157         default.generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+6, 1/24/24/24, 6,27, -31000, -64)
 158
 159         if maxp.y >= 2 and minp.y <= 0 then
 160                 -- Generate clay
 161                 -- Assume X and Z lengths are equal
 162                 local divlen = 4
 163                 local divs = (maxp.x-minp.x)/divlen+1;
 164                 for divx=0+1,divs-1-1 do
 165                 for divz=0+1,divs-1-1 do
 166                         local cx = minp.x + math.floor((divx+0.5)*divlen)
 167                         local cz = minp.z + math.floor((divz+0.5)*divlen)
 168                         if minetest.env:get_node({x=cx,y=1,z=cz}).name == "default:water_source" and
 169                                         minetest.env:get_node({x=cx,y=0,z=cz}).name == "default:sand" then
 170                                 local is_shallow = true
 171                                 local num_water_around = 0
 172                                 if minetest.env:get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 173                                         num_water_around = num_water_around + 1 end
 174                                 if minetest.env:get_node({x=cx+divlen*2,y=1,z=cz+0}).name == "default:water_source" then
 175                                         num_water_around = num_water_around + 1 end
 176                                 if minetest.env:get_node({x=cx+0,y=1,z=cz-divlen*2}).name == "default:water_source" then
 177                                         num_water_around = num_water_around + 1 end
 178                                 if minetest.env:get_node({x=cx+0,y=1,z=cz+divlen*2}).name == "default:water_source" then
 179                                         num_water_around = num_water_around + 1 end
 180                                 if num_water_around >= 2 then
 181                                         is_shallow = false
 182                                 end
 183                                 if is_shallow then
 184                                         for x1=-divlen,divlen do
 185                                         for z1=-divlen,divlen do
 186                                                 if minetest.env:get_node({x=cx+x1,y=0,z=cz+z1}).name == "default:sand" then
 187                                                         minetest.env:set_node({x=cx+x1,y=0,z=cz+z1}, {name="default:clay"})
 188                                                 end
 189                                         end
 190                                         end
 191                                 end
 192                         end
 193                 end
 194                 end
 195                 -- Generate papyrus
 196                 local perlin1 = minetest.env:get_perlin(354, 3, 0.7, 100)
 197                 -- Assume X and Z lengths are equal
 198                 local divlen = 8
 199                 local divs = (maxp.x-minp.x)/divlen+1;
 200                 for divx=0,divs-1 do
 201                 for divz=0,divs-1 do
 202                         local x0 = minp.x + math.floor((divx+0)*divlen)
 203                         local z0 = minp.z + math.floor((divz+0)*divlen)
 204                         local x1 = minp.x + math.floor((divx+1)*divlen)
 205                         local z1 = minp.z + math.floor((divz+1)*divlen)
 206                         -- Determine papyrus amount from perlin noise
 207                         local papyrus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
 208                         -- Find random positions for papyrus based on this random
 209                         local pr = PseudoRandom(seed+1)
 210                         for i=0,papyrus_amount do
 211                                 local x = pr:next(x0, x1)
 212                                 local z = pr:next(z0, z1)
 213                                 if minetest.env:get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
 214                                                 minetest.env:find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
 215                                         default.make_papyrus({x=x,y=2,z=z}, pr:next(2, 4))
 216                                 end
 217                         end
 218                 end
 219                 end
 220                 -- Generate cactuses
 221                 local perlin1 = minetest.env:get_perlin(230, 3, 0.6, 100)
 222                 -- Assume X and Z lengths are equal
 223                 local divlen = 16
 224                 local divs = (maxp.x-minp.x)/divlen+1;
 225                 for divx=0,divs-1 do
 226                 for divz=0,divs-1 do
 227                         local x0 = minp.x + math.floor((divx+0)*divlen)
 228                         local z0 = minp.z + math.floor((divz+0)*divlen)
 229                         local x1 = minp.x + math.floor((divx+1)*divlen)
 230                         local z1 = minp.z + math.floor((divz+1)*divlen)
 231                         -- Determine cactus amount from perlin noise
 232                         local cactus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 6 - 3)
 233                         -- Find random positions for cactus based on this random
 234                         local pr = PseudoRandom(seed+1)
 235                         for i=0,cactus_amount do
 236                                 local x = pr:next(x0, x1)
 237                                 local z = pr:next(z0, z1)
 238                                 -- Find ground level (0...15)
 239                                 local ground_y = nil
 240                                 for y=30,0,-1 do
 241                                         if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air" then
 242                                                 ground_y = y
 243                                                 break
 244                                         end
 245                                 end
 246                                 -- If desert sand, make cactus
 247                                 if ground_y and minetest.env:get_node({x=x,y=ground_y,z=z}).name == "default:desert_sand" then
 248                                         default.make_cactus({x=x,y=ground_y+1,z=z}, pr:next(3, 4))
 249                                 end
 250                         end
 251                 end
 252                 end
 253                 -- Generate grass
 254                 local perlin1 = minetest.env:get_perlin(329, 3, 0.6, 100)
 255                 -- Assume X and Z lengths are equal
 256                 local divlen = 16
 257                 local divs = (maxp.x-minp.x)/divlen+1;
 258                 for divx=0,divs-1 do
 259                 for divz=0,divs-1 do
 260                         local x0 = minp.x + math.floor((divx+0)*divlen)
 261                         local z0 = minp.z + math.floor((divz+0)*divlen)
 262                         local x1 = minp.x + math.floor((divx+1)*divlen)
 263                         local z1 = minp.z + math.floor((divz+1)*divlen)
 264                         -- Determine grass amount from perlin noise
 265                         local grass_amount = math.floor(perlin1:get2d({x=x0, y=z0}) ^ 3 * 9)
 266                         -- Find random positions for grass based on this random
 267                         local pr = PseudoRandom(seed+1)
 268                         for i=0,grass_amount do
 269                                 local x = pr:next(x0, x1)
 270                                 local z = pr:next(z0, z1)
 271                                 -- Find ground level (0...15)
 272                                 local ground_y = nil
 273                                 for y=30,0,-1 do
 274                                         if minetest.env:get_node({x=x,y=y,z=z}).name ~= "air" then
 275                                                 ground_y = y
 276                                                 break
 277                                         end
 278                                 end
 279
 280                                 if ground_y then
 281                                         local p = {x=x,y=ground_y+1,z=z}
 282                                         local nn = minetest.env:get_node(p).name
 283                                         -- Check if the node can be replaced
 284                                         if minetest.registered_nodes[nn] and
 285                                                 minetest.registered_nodes[nn].buildable_to then
 286                                                 nn = minetest.env:get_node({x=x,y=ground_y,z=z}).name
 287                                                 -- If desert sand, add dry shrub
 288                                                 if nn == "default:desert_sand" then
 289                                                         minetest.env:set_node(p,{name="default:dry_shrub"})
 290
 291                                                 -- If dirt with grass, add grass
 292                                                 elseif nn == "default:dirt_with_grass" then
 293                                                         minetest.env:set_node(p,{name="default:grass_"..pr:next(1, 5)})
 294                                                 end
 295                                         end
 296                                 end
 297
 298                         end
 299                 end
 300                 end
 301         end
 302
 303         -- Generate nyan cats
 304         generate_nyancats(seed, minp, maxp)
 305 end)
 306