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
  26 --
  27 -- Ore generation
  28 --
  29
  30 local function generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume, ore_per_chunk, height_min, height_max)
  31         if maxp.y < height_min or minp.y > height_max then
  32                 return
  33         end
  34         local y_min = math.max(minp.y, height_min)
  35         local y_max = math.min(maxp.y, height_max)
  36         local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
  37         local pr = PseudoRandom(seed)
  38         local num_chunks = math.floor(chunks_per_volume * volume)
  39         local chunk_size = 3
  40         if ore_per_chunk <= 4 then
  41                 chunk_size = 2
  42         end
  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 local function 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                 minetest.env:set_node(p, {name="default:papyrus"})
  75         end
  76 end
  77
  78 minetest.register_on_generated(function(minp, maxp, seed)
  79         generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed,   1/8/8/8,    5, -31000,  64)
  80         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+1, 1/16/16/16, 5,   -5,   7)
  81         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+2, 1/12/12/12, 5, -16,   -5)
  82         generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+3, 1/9/9/9,    5, -31000, -17)
  83         if maxp.y >= 2 and minp.y <= 0 then
  84                 -- Generate clay
  85                 -- Assume X and Z lengths are equal
  86                 local divlen = 4
  87                 local divs = (maxp.x-minp.x)/divlen+1;
  88                 for divx=0+1,divs-1-1 do
  89                 for divz=0+1,divs-1-1 do
  90                         local cx = minp.x + math.floor((divx+0.5)*divlen)
  91                         local cz = minp.z + math.floor((divz+0.5)*divlen)
  92                         if minetest.env:get_node({x=cx,y=1,z=cz}).name == "default:water_source" and
  93                                         minetest.env:get_node({x=cx,y=0,z=cz}).name == "default:sand" then
  94                                 local is_shallow = true
  95                                 local num_water_around = 0
  96                                 if minetest.env:get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "default:water_source" then
  97                                         num_water_around = num_water_around + 1 end
  98                                 if minetest.env:get_node({x=cx+divlen*2,y=1,z=cz+0}).name == "default:water_source" then
  99                                         num_water_around = num_water_around + 1 end
 100                                 if minetest.env:get_node({x=cx+0,y=1,z=cz-divlen*2}).name == "default:water_source" then
 101                                         num_water_around = num_water_around + 1 end
 102                                 if minetest.env:get_node({x=cx+0,y=1,z=cz+divlen*2}).name == "default:water_source" then
 103                                         num_water_around = num_water_around + 1 end
 104                                 if num_water_around >= 2 then
 105                                         is_shallow = false
 106                                 end
 107                                 if is_shallow then
 108                                         for x1=-divlen,divlen do
 109                                         for z1=-divlen,divlen do
 110                                                 if minetest.env:get_node({x=cx+x1,y=0,z=cz+z1}).name == "default:sand" then
 111                                                         minetest.env:set_node({x=cx+x1,y=0,z=cz+z1}, {name="default:clay"})
 112                                                 end
 113                                         end
 114                                         end
 115                                 end
 116                         end
 117                 end
 118                 end
 119                 -- Generate papyrus
 120                 local perlin1 = minetest.env:get_perlin(354, 3, 0.7, 100)
 121                 -- Assume X and Z lengths are equal
 122                 local divlen = 8
 123                 local divs = (maxp.x-minp.x)/divlen+1;
 124                 for divx=0,divs-1 do
 125                 for divz=0,divs-1 do
 126                         local x0 = minp.x + math.floor((divx+0)*divlen)
 127                         local z0 = minp.z + math.floor((divz+0)*divlen)
 128                         local x1 = minp.x + math.floor((divx+1)*divlen)
 129                         local z1 = minp.z + math.floor((divz+1)*divlen)
 130                         -- Determine papyrus amount from perlin noise
 131                         local papyrus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
 132                         -- Find random positions for papyrus based on this random
 133                         local pr = PseudoRandom(seed+1)
 134                         for i=0,papyrus_amount do
 135                                 local x = pr:next(x0, x1)
 136                                 local z = pr:next(z0, z1)
 137                                 if minetest.env:get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
 138                                                 minetest.env:find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
 139                                         make_papyrus({x=x,y=2,z=z}, pr:next(2, 4))
 140                                 end
 141                         end
 142                 end
 143                 end
 144         end
 145 end)
 146