254 lines
7.3 KiB
Lua
254 lines
7.3 KiB
Lua
-- watershedmini 0.1.0 by paramat
|
|
-- For latest stable Minetest and back to 0.4.8
|
|
-- Depends default
|
|
-- License: code WTFPL, textures CC BY-SA
|
|
|
|
-- Parameters
|
|
|
|
local ZOOM = 32
|
|
|
|
local YMIN = -33000 -- Approximate base of realm stone
|
|
local YMAX = 33000 -- Approximate top of atmosphere / mountains / floatlands
|
|
local TERCEN = -160/ZOOM -- Terrain 'centre', average seabed level
|
|
local YWAT = 0 -- Sea surface y
|
|
|
|
local TERSCA = 512/ZOOM -- Vertical terrain scale
|
|
local XLSAMP = 0.2 -- Extra large scale height variation amplitude
|
|
local BASAMP = 0.4 -- Base terrain amplitude
|
|
local CANAMP = 0.4 -- Canyon terrain maximum amplitude
|
|
local ATANAMP = 1.1 -- Arctan function amplitude, smaller = more and larger floatlands above ridges
|
|
|
|
local TRIV = -0.02 -- Maximum densitybase threshold for river water
|
|
|
|
local HITET = 0.35 -- High temperature threshold
|
|
local LOTET = -0.35 -- Low ..
|
|
local ICETET = -0.7 -- Ice ..
|
|
local HIHUT = 0.35 -- High humidity threshold
|
|
local LOHUT = -0.35 -- Low ..
|
|
|
|
-- 3D noise for rough terrain
|
|
|
|
local np_rough = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=512/ZOOM, y=512/ZOOM, z=512/ZOOM},
|
|
seed = 593,
|
|
octaves = 4,
|
|
persist = 0.67
|
|
}
|
|
|
|
-- 3D noise for smooth terrain
|
|
|
|
local np_smooth = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=512/ZOOM, y=512/ZOOM, z=512/ZOOM},
|
|
seed = 593,
|
|
octaves = 4,
|
|
persist = 0.33
|
|
}
|
|
|
|
-- 2D noise for base terrain / riverbed height, terrain blend, river and river sand depth
|
|
|
|
local np_base = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=4096/ZOOM, y=4096/ZOOM, z=4096/ZOOM},
|
|
seed = 8890,
|
|
octaves = 3,
|
|
persist = 0.33
|
|
}
|
|
|
|
-- 2D noise for extra large scale height variation
|
|
|
|
local np_xlscale = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=8192/ZOOM, y=8192/ZOOM, z=8192/ZOOM},
|
|
seed = -72,
|
|
octaves = 3,
|
|
persist = 0.33
|
|
}
|
|
|
|
-- 3D noise for temperature
|
|
|
|
local np_temp = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=1024/ZOOM, y=1024/ZOOM, z=1024/ZOOM},
|
|
seed = 9130,
|
|
octaves = 2,
|
|
persist = 0.5
|
|
}
|
|
|
|
-- 3D noise for humidity
|
|
|
|
local np_humid = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x=1024/ZOOM, y=1024/ZOOM, z=1024/ZOOM},
|
|
seed = -55500,
|
|
octaves = 2,
|
|
persist = 0.5
|
|
}
|
|
|
|
-- Stuff
|
|
|
|
dofile(minetest.get_modpath("watershedmini").."/nodes.lua")
|
|
|
|
-- Set mapgen parameters
|
|
|
|
minetest.register_on_mapgen_init(function(mgparams)
|
|
minetest.set_mapgen_params({mgname="singlenode"})
|
|
end)
|
|
|
|
-- On generated function
|
|
|
|
minetest.register_on_generated(function(minp, maxp, seed)
|
|
if minp.y < YMIN or maxp.y > YMAX then
|
|
return
|
|
end
|
|
|
|
local t1 = os.clock()
|
|
local x1 = maxp.x
|
|
local y1 = maxp.y
|
|
local z1 = maxp.z
|
|
local x0 = minp.x
|
|
local y0 = minp.y
|
|
local z0 = minp.z
|
|
|
|
print ("[watershedmini] chunk minp ("..x0.." "..y0.." "..z0..")")
|
|
-- voxelmanip stuff
|
|
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip") -- min, max points for emerged area/voxelarea
|
|
local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax} -- voxelarea helper for indexes
|
|
local data = vm:get_data() -- get flat array of voxelarea content ids
|
|
-- content ids
|
|
local c_air = minetest.get_content_id("air")
|
|
local c_water = minetest.get_content_id("default:water_source")
|
|
local c_sand = minetest.get_content_id("default:sand")
|
|
local c_desand = minetest.get_content_id("default:desert_sand")
|
|
local c_snowblock = minetest.get_content_id("default:snowblock")
|
|
local c_ice = minetest.get_content_id("default:ice")
|
|
|
|
local c_freshwater = minetest.get_content_id("watershedmini:freshwater")
|
|
local c_grass = minetest.get_content_id("watershedmini:grass")
|
|
local c_drygrass = minetest.get_content_id("watershedmini:drygrass")
|
|
local c_icydirt = minetest.get_content_id("watershedmini:icydirt")
|
|
local c_appleaf = minetest.get_content_id("watershedmini:appleleaf")
|
|
local c_junleaf = minetest.get_content_id("watershedmini:jungleleaf")
|
|
-- perlinmap stuff
|
|
local sidelen = x1 - x0 + 1 -- chunk sidelength
|
|
local chulens = {x=sidelen, y=sidelen, z=sidelen} -- chunk dimensions
|
|
local minposxyz = {x=x0, y=y0, z=z0} -- 3D and 2D perlinmaps start from these co-ordinates
|
|
local minposxz = {x=x0, y=z0}
|
|
-- 3D and 2D perlinmaps
|
|
local nvals_rough = minetest.get_perlin_map(np_rough, chulens):get3dMap_flat(minposxyz)
|
|
local nvals_smooth = minetest.get_perlin_map(np_smooth, chulens):get3dMap_flat(minposxyz)
|
|
local nvals_temp = minetest.get_perlin_map(np_temp, chulens):get3dMap_flat(minposxyz)
|
|
local nvals_humid = minetest.get_perlin_map(np_humid, chulens):get3dMap_flat(minposxyz)
|
|
|
|
local nvals_base = minetest.get_perlin_map(np_base, chulens):get2dMap_flat(minposxz)
|
|
local nvals_xlscale = minetest.get_perlin_map(np_xlscale, chulens):get2dMap_flat(minposxz)
|
|
|
|
-- mapgen loop
|
|
local nixyz = 1 -- 3D and 2D perlinmap indexes
|
|
local nixz = 1
|
|
for z = z0, z1 do -- for each xy plane progressing northwards
|
|
for y = y0, y1 do -- for each x row progressing upwards
|
|
local vi = area:index(x0, y, z) -- voxelmanip index for first node in this x row
|
|
for x = x0, x1 do -- for each node do
|
|
local n_rough = nvals_rough[nixyz]
|
|
local n_smooth = nvals_smooth[nixyz]
|
|
local n_temp = nvals_temp[nixyz]
|
|
local n_humid = nvals_humid[nixyz]
|
|
|
|
local n_base = nvals_base[nixz]
|
|
local n_xlscale = nvals_xlscale[nixz]
|
|
|
|
local grad = math.atan((TERCEN - y) / TERSCA) * ATANAMP
|
|
local densitybase = (1 - math.abs(n_base)) * BASAMP + n_xlscale * XLSAMP + grad
|
|
local terblen = math.max(1 - math.abs(n_base), 0)
|
|
local terblenexp = terblen ^ 2
|
|
local canexp = 0.5 + terblenexp
|
|
local canamp = 0.02 + terblenexp * 0.4
|
|
local densitycan =
|
|
(math.abs(n_rough * terblenexp + n_smooth * (1 - terblenexp))) ^ canexp * canamp
|
|
local density = densitybase + densitycan
|
|
-- other values
|
|
local triv = TRIV * (1 - terblen) -- river threshold
|
|
|
|
local biome = false -- select biome for node
|
|
if n_temp < LOTET then
|
|
if n_humid < LOHUT then
|
|
biome = 1 -- tundra
|
|
elseif n_humid > HIHUT then
|
|
biome = 3 -- taiga
|
|
else
|
|
biome = 2 -- snowy plains
|
|
end
|
|
elseif n_temp > HITET then
|
|
if n_humid < LOHUT then
|
|
biome = 7 -- desert
|
|
elseif n_humid > HIHUT then
|
|
biome = 9 -- rainforest
|
|
else
|
|
biome = 8 -- savanna
|
|
end
|
|
else
|
|
if n_humid < LOHUT then
|
|
biome = 4 -- dry grassland
|
|
elseif n_humid > HIHUT then
|
|
biome = 6 -- deciduous forest
|
|
else
|
|
biome = 5 -- grassland
|
|
end
|
|
end
|
|
|
|
if density >= 0 then -- ground
|
|
if y < YWAT then
|
|
data[vi] = c_sand
|
|
elseif biome == 1 then
|
|
data[vi] = c_icydirt
|
|
elseif biome == 2 or biome == 3 then
|
|
data[vi] = c_snowblock
|
|
elseif biome == 4 then
|
|
data[vi] = c_drygrass
|
|
elseif biome == 5 then
|
|
data[vi] = c_appleaf
|
|
elseif biome == 6 then
|
|
data[vi] = c_grass
|
|
elseif biome == 7 then
|
|
data[vi] = c_desand
|
|
elseif biome == 8 then
|
|
data[vi] = c_drygrass
|
|
elseif biome == 9 then
|
|
data[vi] = c_junleaf
|
|
end
|
|
elseif y <= YWAT then -- sea water
|
|
if n_temp <= ICETET then
|
|
data[vi] = c_ice
|
|
else
|
|
data[vi] = c_water
|
|
end
|
|
elseif densitybase >= triv then -- river water
|
|
data[vi] = c_freshwater
|
|
end
|
|
|
|
nixyz = nixyz + 1 -- increment perlinmap and voxelarea indexes along x row
|
|
nixz = nixz + 1
|
|
vi = vi + 1
|
|
end
|
|
nixz = nixz - 80
|
|
end
|
|
nixz = nixz + 80
|
|
end
|
|
-- voxelmanip stuff
|
|
vm:set_data(data)
|
|
vm:set_lighting({day=0, night=0})
|
|
vm:calc_lighting()
|
|
vm:write_to_map(data)
|
|
|
|
local chugent = math.ceil((os.clock() - t1) * 1000) -- chunk generation time
|
|
print ("[watershedmini] "..chugent.." ms")
|
|
end)
|