299 lines
7.4 KiB
Lua
299 lines
7.4 KiB
Lua
-- Parameters
|
|
|
|
local YWATER = 1 -- y of water level
|
|
local YSURF = 4 -- y of surface centre and top of beach
|
|
local TERSCA = 128 -- Terrain vertical scale in nodes
|
|
local TSTONE = 0.04 -- Stone density threshold, depth of sand or biome nodes
|
|
local DEBUG = false
|
|
|
|
-- 3D noise
|
|
|
|
local np_terrain = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x = 384, y = 192, z = 384},
|
|
seed = 5900033,
|
|
octaves = 5,
|
|
persist = 0.63,
|
|
lacunarity = 2.0,
|
|
--flags = ""
|
|
}
|
|
|
|
-- 2D noise
|
|
|
|
local np_biome = {
|
|
offset = 0,
|
|
scale = 1,
|
|
spread = {x = 512, y = 512, z = 512},
|
|
seed = -188900,
|
|
octaves = 3,
|
|
persist = 0.4,
|
|
lacunarity = 2.0,
|
|
--flags = ""
|
|
}
|
|
|
|
|
|
-- Nodes
|
|
|
|
minetest.register_node("stability:grass", {
|
|
description = "Grass",
|
|
tiles = {"default_grass.png", "default_dirt.png", "default_grass.png"},
|
|
groups = {crumbly = 3},
|
|
sounds = default.node_sound_dirt_defaults({
|
|
footstep = {name = "default_grass_footstep", gain = 0.25},
|
|
}),
|
|
})
|
|
|
|
minetest.register_node("stability:dirt", {
|
|
description = "Dirt",
|
|
tiles = {"default_dirt.png"},
|
|
groups = {crumbly = 3},
|
|
sounds = default.node_sound_dirt_defaults(),
|
|
})
|
|
|
|
|
|
-- Set mapgen parameters
|
|
|
|
minetest.set_mapgen_params({mgname = "singlenode",
|
|
flags = "nolight", water_level = YWATER})
|
|
|
|
|
|
-- Constants
|
|
|
|
local c_air = minetest.CONTENT_AIR
|
|
local c_ignore = minetest.CONTENT_IGNORE
|
|
|
|
local c_stone = minetest.get_content_id("default:stone")
|
|
local c_destone = minetest.get_content_id("default:desert_stone")
|
|
local c_sand = minetest.get_content_id("default:sand")
|
|
local c_desand = minetest.get_content_id("default:desert_sand")
|
|
local c_dirtsnow = minetest.get_content_id("default:dirt_with_snow")
|
|
local c_water = minetest.get_content_id("default:water_source")
|
|
|
|
local c_grass = minetest.get_content_id("stability:grass")
|
|
local c_dirt = minetest.get_content_id("stability:dirt")
|
|
|
|
|
|
-- Initialize noise objects to nil
|
|
|
|
local nobj_terrain = nil
|
|
local nobj_biome = nil
|
|
|
|
|
|
-- Localise noise buffers
|
|
|
|
local nbuf_terrain
|
|
local nbuf_biome
|
|
|
|
|
|
-- On generated function
|
|
|
|
minetest.register_on_generated(function(minp, maxp, seed)
|
|
local t0 = 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
|
|
|
|
local sidelen = x1 - x0 + 1
|
|
local ystridevm = sidelen + 32 -- strides for voxelmanip
|
|
local zstridevm = ystridevm ^ 2
|
|
local ystridepm = sidelen + 2 -- strides for perlinmaps, densitymap, stability map
|
|
local zstridepm = ystridepm ^ 2
|
|
|
|
local chulens3d = {x = sidelen + 2, y = sidelen + 2, z = sidelen + 2}
|
|
local chulens2d = {x = sidelen + 2, y = sidelen + 2, z = 1}
|
|
local minpos3d = {x = x0 - 1, y = y0 - 1, z = z0 - 1}
|
|
local minpos2d = {x = x0 - 1, y = z0 - 1}
|
|
|
|
nobj_terrain = nobj_terrain or minetest.get_perlin_map(np_terrain, chulens3d)
|
|
nobj_biome = nobj_biome or minetest.get_perlin_map(np_biome, chulens2d)
|
|
|
|
local nvals_terrain = nobj_terrain:get3dMap_flat(minpos3d, nbuf_terrain)
|
|
local nvals_biome = nobj_biome:get2dMap_flat(minpos2d, nbuf_biome)
|
|
|
|
local dvals = {} -- 3D densitymap
|
|
|
|
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
|
|
local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
|
|
local data = vm:get_data()
|
|
|
|
-- Place stone
|
|
local ni3d = 1
|
|
local ni2d = 1
|
|
for z = z0 - 1, z1 + 1 do
|
|
for y = y0 - 1, y1 + 1 do
|
|
local vi = area:index(x0 - 1, y, z)
|
|
for x = x0 - 1, x1 + 1 do
|
|
local n_terrain = nvals_terrain[ni3d]
|
|
local n_biome = nvals_biome[ni2d]
|
|
|
|
local grad = (YSURF - y) / TERSCA
|
|
local tstone = TSTONE
|
|
if y < YSURF then -- make shore and seabed shallower
|
|
grad = grad * 4
|
|
tstone = TSTONE * 4
|
|
end
|
|
local density = n_terrain + grad
|
|
dvals[ni3d] = density
|
|
|
|
if density >= tstone then
|
|
if n_biome > 0.4 then
|
|
data[vi] = c_destone
|
|
else
|
|
data[vi] = c_stone
|
|
end
|
|
elseif y == y1 + 1 and x >= x0 and x <= x1 and z >= z0 and z <= z1 then
|
|
data[vi] = c_air
|
|
end
|
|
|
|
ni3d = ni3d + 1
|
|
ni2d = ni2d + 1
|
|
vi = vi + 1
|
|
end
|
|
ni2d = ni2d - ystridepm
|
|
end
|
|
ni2d = ni2d + ystridepm
|
|
end
|
|
|
|
-- Place sub-surface biome nodes
|
|
local stable = {} -- stability map
|
|
for y = y0, y1 + 1 do
|
|
local tstone = TSTONE
|
|
if y < YSURF then
|
|
tstone = TSTONE * 4
|
|
end
|
|
for z = z0, z1 do
|
|
local vi = area:index(x0, y, z)
|
|
local di = (z - z0 + 1) * zstridepm + -- densitymap index
|
|
(y - y0 + 1) * ystridepm + 2 -- +2 because starting at x = x0
|
|
local ni2d = (z - z0 + 1) * ystridepm + 2 -- biome noise and stability maps
|
|
|
|
for x = x0, x1 do
|
|
local density = dvals[di]
|
|
local n_biome = nvals_biome[ni2d]
|
|
|
|
if density >= tstone then -- existing stone
|
|
stable[ni2d] = true
|
|
elseif density >= 0 and (stable[ni2d] or y == y0) then -- biome layer
|
|
local nodu = data[(vi - ystridevm)]
|
|
local node = data[(vi - ystridevm + 1)]
|
|
local nodw = data[(vi - ystridevm - 1)]
|
|
local nodn = data[(vi - ystridevm + zstridevm)]
|
|
local nods = data[(vi - ystridevm - zstridevm)]
|
|
local nodne = data[(vi - ystridevm + zstridevm + 1)]
|
|
local nodnw = data[(vi - ystridevm + zstridevm - 1)]
|
|
local nodse = data[(vi - ystridevm - zstridevm + 1)]
|
|
local nodsw = data[(vi - ystridevm - zstridevm - 1)]
|
|
|
|
if y == y0 then -- also check for ignore
|
|
if nodu == c_air or nodu == c_ignore
|
|
or node == c_air or node == c_ignore
|
|
or nodw == c_air or nodw == c_ignore
|
|
or nodn == c_air or nodn == c_ignore
|
|
or nods == c_air or nods == c_ignore
|
|
or nodne == c_air or nodne == c_ignore
|
|
or nodnw == c_air or nodnw == c_ignore
|
|
or nodse == c_air or nodse == c_ignore
|
|
or nodsw == c_air or nodsw == c_ignore then
|
|
stable[ni2d] = false
|
|
else
|
|
stable[ni2d] = true
|
|
end
|
|
else
|
|
if node == c_air
|
|
or nodw == c_air
|
|
or nodn == c_air
|
|
or nods == c_air
|
|
or nodne == c_air
|
|
or nodnw == c_air
|
|
or nodse == c_air
|
|
or nodsw == c_air then
|
|
stable[ni2d] = false
|
|
end
|
|
end
|
|
|
|
if stable[ni2d] then
|
|
if y <= YSURF then
|
|
data[vi] = c_sand
|
|
elseif n_biome > 0.4 then
|
|
data[vi] = c_desand
|
|
elseif n_biome < -0.4 then
|
|
data[vi] = c_dirt
|
|
else
|
|
data[vi] = c_dirt
|
|
end
|
|
end
|
|
else
|
|
stable[ni2d] = false
|
|
end
|
|
|
|
vi = vi + 1
|
|
di = di + 1
|
|
ni2d = ni2d + 1
|
|
end
|
|
end
|
|
end
|
|
|
|
if y1 > YSURF then
|
|
-- Place surface biome nodes
|
|
for z = z0, z1 do
|
|
local ni2d = (z - z0 + 1) * ystridepm + 2
|
|
for x = x0, x1 do
|
|
local aircount = 0
|
|
local n_biome = nvals_biome[ni2d]
|
|
local vi = area:index(x, y1 + 2, z)
|
|
for y = y1 + 2, y0, -1 do
|
|
if y <= YSURF then
|
|
break
|
|
end
|
|
|
|
local nodid = data[vi]
|
|
if nodid == c_air then
|
|
aircount = aircount + 1
|
|
elseif aircount >= 1 then -- surface found
|
|
if nodid == c_dirt then
|
|
if n_biome < -0.4 then
|
|
data[vi] = c_dirtsnow
|
|
else
|
|
data[vi] = c_grass
|
|
end
|
|
end
|
|
aircount = 0
|
|
end
|
|
vi = vi - ystridevm
|
|
end
|
|
ni2d = ni2d + 1
|
|
end
|
|
end
|
|
end
|
|
|
|
if y0 <= YWATER then
|
|
-- Place water
|
|
for z = z0, z1 do
|
|
for y = y0, y1 do
|
|
local vi = area:index(x0, y, z)
|
|
for x = x0, x1 do
|
|
if data[vi] == c_air and y <= YWATER then
|
|
data[vi] = c_water
|
|
end
|
|
vi = vi + 1
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
vm:set_data(data)
|
|
vm:calc_lighting({x = x0, y = y0 - 1, z = z0}, {x = x1, y = y1 + 1, z = z1})
|
|
vm:write_to_map(data)
|
|
vm:update_liquids()
|
|
|
|
if DEBUG then
|
|
local chugent = math.ceil((os.clock() - t0) * 1000)
|
|
print ("[stability] "..chugent.." ms")
|
|
end
|
|
end)
|