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