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mapgen.lua
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--Makes a stratus of rocks
--name of the rock to generate
--wherein kind of node to replace, for example default:stone
--minp, maxp the corners of the map to be generated
--seed random seed
--stratus_chance inverse probability in a given radius 1:2, 1:3 etc
--radius horizontal radius of the stratus
--radius_y vertical radius of the stratus
--deep how deep can be from the ground
local function generate_stratus(name, wherein, ceilin, ceil, minp, maxp, seed, stratus_chance, radius, radius_y, deep, height_min, height_max)
if maxp.y < height_min or minp.y > height_max then
return
end
-- it will be only generate a stratus for every 100 m of area
local stratus_per_volume=1
local area=45
local y_min = math.max(minp.y, height_min)
local y_max = math.min(maxp.y, height_max)
local volume = ((maxp.x-minp.x+1)/area)*((y_max-y_min+1)/area)*((maxp.z-minp.z+1)/area)
local pr = PseudoRandom(seed)
local blocks = math.floor(stratus_per_volume*volume)
print(" <<"..dump(name)..">>");
if blocks == 0 then
blocks = 1
end
print(" blocks: "..dump(blocks).." in vol: "..dump(volume).." ("..dump(maxp.x-minp.x+1)..","..dump(y_max-y_min+1)..","..dump(maxp.z-minp.z+1)..")")
for i=1,blocks do
local x = pr:next(1,stratus_chance)
if x == 1 then
-- TODO deep
local y0=y_max-radius_y+1
if y0 < y_min then
y0=y_min
else
y0=pr:next(y_min, y0)
end
local x0 = maxp.x-radius+1
if x0 < minp.x then
x0 = minp.x
else
x0 = pr:next(minp.x, x0)
end
local z0 = maxp.z-radius+1
if z0 < minp.z then
x0 = minp.z
else
z0 = pr:next(minp.z, z0)
end
local p0 = {x=x0, y=y0, z=z0}
local n = minetest.env:get_node(p0).name
local i = 0
--print(" upper node "..n)
x = 0
for k, v in ipairs(ceilin) do
if n == v then
x = 1
break
end
end
if x == 1 then
-- search for the node to replace
--print(" Searching nodes to replace from "..dump(y0-1).." to "..dump(y_min))
for y1=y0-1,y_min,-1 do
p0.y=y1
n = minetest.env:get_node(p0).name
x = 0
for k, v in ipairs(wherein) do
if n == v then
x = 1
break
end
end
if x == 1 then
y0=y1-deep
if y0 < y_min then
y0 = y_min
end
break
end
end
local rx=pr:next(radius/2,radius)+1
local rz=pr:next(radius/2,radius)+1
local ry=pr:next(radius_y/2,radius_y)+1
--print(" area of generation ("..dump(rx)..","..dump(rz)..","..dump(ry)..")")
for x1=0,rx do
rz = rz + 3 - pr:next(1,6)
if rz < 1 then
rz = 1
end
for z1=pr:next(1,3),rz do
local ry0=ry+ pr:next(1,3)
for y1=pr:next(1,3),ry0 do
local x2 = x0+x1
local y2 = y0+y1
local z2 = z0+z1
local p2 = {x=x2, y=y2, z=z2}
n = minetest.env:get_node(p2).name
x = 0
for k, v in ipairs(wherein) do
if n == v then
x = 1
break
end
end
if x == 1 then
if ceil == nil then
minetest.env:set_node(p2, {name=name})
i = i +1
else
local p3 = {p2.x,p2.y+1,p2}
if minetest.env:get_node(p3).name == ceil then
minetest.env:set_node(p2, {name=name})
i = i +1
end
end
end
end
end
end
print(" generated "..dump(i).." blocks in ("..dump(x0)..","..dump(y0)..","..dump(z0)..")")
end
end
end
--print("generate_ore done")
end
local function generate_claylike(name, minp, maxp, seed, chance, minh, maxh, dirt)
if maxp.y >= maxh+1 and minp.y <= minh-1 then
local pr = PseudoRandom(seed)
local divlen = 4
local divs = (maxp.x-minp.x)/divlen+1;
for yy=minh,maxh do
local x = pr:next(1,chance)
if x == 1 then
for divx=0+1,divs-1-1 do
for divz=0+1,divs-1-1 do
local cx = minp.x + math.floor((divx+0.5)*divlen)
local cz = minp.z + math.floor((divz+0.5)*divlen)
local up = minetest.env:get_node({x=cx,y=yy,z=cz}).name
local down = minetest.env:get_node({x=cx,y=yy-1,z=cz}).name
if ( up == "default:water_source" or up == "air" ) and
( down == "default:sand" or (dirt == 1 and (down == "default:dirt" or down == "default:dirt_with_grass" ))) then
local is_shallow = true
local num_water_around = 0
if minetest.env:get_node({x=cx-divlen*2,y=yy,z=cz}).name == "default:water_source" then
num_water_around = num_water_around + 1 end
if minetest.env:get_node({x=cx+divlen*2,y=yy,z=cz}).name == "default:water_source" then
num_water_around = num_water_around + 1 end
if minetest.env:get_node({x=cx,y=yy,z=cz-divlen*2}).name == "default:water_source" then
num_water_around = num_water_around + 1 end
if minetest.env:get_node({x=cx,y=yy,z=cz+divlen*2}).name == "default:water_source" then
num_water_around = num_water_around + 1 end
if num_water_around >= 3 then
is_shallow = false
end
if is_shallow then
for x1=-divlen,divlen do
for z1=-divlen,divlen do
local p={x=cx+x1,y=yy-1,z=cz+z1}
down = minetest.env:get_node(p).name
if down == "default:sand" or (dirt == 1 and (down == "default:dirt" or down == "default:dirt_with_grass")) then
minetest.env:set_node(p, {name=name})
end
end
end
end
end
end
end
end
end
end
end
local function generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume, chunk_size, ore_per_chunk, height_min, height_max)
if maxp.y < height_min or minp.y > height_max then
return
end
local y_min = math.max(minp.y, height_min)
local y_max = math.min(maxp.y, height_max)
local volume = (maxp.x-minp.x+1)*(y_max-y_min+1)*(maxp.z-minp.z+1)
local pr = PseudoRandom(seed)
local num_chunks = math.floor(chunks_per_volume * volume)
local inverse_chance = math.floor(chunk_size*chunk_size*chunk_size / ore_per_chunk)
--print("generate_ore num_chunks: "..dump(num_chunks))
for i=1,num_chunks do
local y0 = pr:next(y_min, y_max-chunk_size+1)
if y0 >= height_min and y0 <= height_max then
local x0 = pr:next(minp.x, maxp.x-chunk_size+1)
local z0 = pr:next(minp.z, maxp.z-chunk_size+1)
local p0 = {x=x0, y=y0, z=z0}
for x1=0,chunk_size-1 do
for y1=0,chunk_size-1 do
for z1=0,chunk_size-1 do
if pr:next(1,inverse_chance) == 1 then
local x2 = x0+x1
local y2 = y0+y1
local z2 = z0+z1
local p2 = {x=x2, y=y2, z=z2}
if minetest.env:get_node(p2).name == wherein then
minetest.env:set_node(p2, {name=name})
end
end
end
end
end
end
end
--print("generate_ore done")
end
minetest.register_on_generated(function(minp, maxp, seed)
-- Generate stratus
print("DARKAGE: Generate stratus");
generate_ore("darkage:desert_stone_with_iron", "default:desert_stone", minp, maxp, seed+0, 1/7/7/7, 3, 5, -15, 40)
generate_claylike("darkage:mud", minp, maxp, seed+1, 4, 0, 2, 0)
generate_claylike("darkage:silt", minp, maxp, seed+2, 4, -1, 1, 1)
generate_stratus("darkage:chalk",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+3, 4, 25, 8, 0, -20, 50)
generate_stratus("darkage:ors",
{"default:stone"},
{"default:stone","air","default:water_source"}, nil,
minp, maxp, seed+4, 4, 25, 7, 50, -200, 500)
generate_stratus("darkage:shale",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+5, 4, 23, 7, 50, -50, 20)
generate_stratus("darkage:slate",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+6, 6, 23, 5, 50, -500, 0)
generate_stratus("darkage:schist",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+7, 6, 19, 6, 50, -31000, -10)
generate_stratus("darkage:basalt",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+8, 5, 20, 5, 20, -31000, -50)
generate_stratus("darkage:marble",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+9, 4, 25, 6, 50, -31000, -75)
generate_stratus("darkage:serpentine",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+10, 4, 28, 8, 50, -31000, -350)
generate_stratus("darkage:gneiss",
{"default:stone"},
{"default:stone","air"}, nil,
minp, maxp, seed+11, 4, 15, 5, 50, -31000, -250)
end)