310 lines
8.3 KiB
Lua
310 lines
8.3 KiB
Lua
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-- submodule
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otherworlds.asteroids = {}
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-- Approximate realm limits
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local XMIN = -33000
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local XMAX = 33000
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local ZMIN = -33000
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local ZMAX = 33000
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local ASCOT = 1.0 -- Large asteroid / comet nucleus noise threshold
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local SASCOT = 1.0 -- Small asteroid / comet nucleus noise threshold
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local STOT = 0.125 -- Asteroid stone threshold
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local COBT = 0.05 -- Asteroid cobble threshold
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local GRAT = 0.02 -- Asteroid gravel threshold
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local ICET = 0.05 -- Comet ice threshold
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local ATMOT = -0.2 -- Comet atmosphere threshold
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local FISTS = 0.01 -- Fissure noise threshold at surface. Controls size of fissures and amount / size of fissure entrances
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local FISEXP = 0.3 -- Fissure expansion rate under surface
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local ORECHA = otherworlds.settings.ore_chance.value -- Ore 1/x chance per stone node
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local CPCHU = 0 -- Maximum craters per chunk
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local CRMIN = 5 -- Crater radius minimum, radius includes dust and obsidian layers
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local CRRAN = 8 -- Crater radius range
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local random = math.random
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local floor = math.floor
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local abs = math.abs
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-- Note: for fewer large objects: increase the 'spread' numbers in 'np_large' noise parameters. For fewer small objects do the same in 'np_small'. Then tune size with 'ASCOT'
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local np_large = { -- 3D Perlin noise 1 for large structures
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offset = 0,
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scale = 1,
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spread = {x = 256, y = 128, z = 256},
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seed = -83928935,
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octaves = 5,
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persist = 0.6}
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local np_fissure = { -- 3D Perlin noise 3 for fissures
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offset = 0,
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scale = 1,
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spread = {x = 64, y = 64, z = 64},
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seed = -188881,
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octaves = 4,
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persist = 0.5}
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local np_small = { -- 3D Perlin noise 4 for small structures
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offset = 0,
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scale = 1,
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spread = {x = 128, y = 64, z = 128},
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seed = 1000760700090,
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octaves = 4,
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persist = 0.6}
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local np_ores = { -- 3D Perlin noise 5 for ore selection
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offset = 0,
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scale = 1,
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spread = {x = 128, y = 128, z = 128},
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seed = -70242,
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octaves = 1,
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persist = 0.5}
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local np_latmos = { -- 3D Perlin noise 6 for comet atmosphere
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offset = 0,
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scale = 1,
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spread = {x = 256, y = 128, z = 256},
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seed = -83928935,
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octaves = 3,
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persist = 0.6}
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local np_satmos = { -- 3D Perlin noise 7 for small comet atmosphere
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offset = 0,
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scale = 1,
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spread = {x = 128, y = 64, z = 128},
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seed = 1000760700090,
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octaves = 2,
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persist = 0.6}
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-- On dignode function. Atmosphere flows into a dug hole.
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minetest.register_on_dignode(function(pos, oldnode, digger)
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if minetest.find_node_near(pos, 1, {"asteroid:atmos"})
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and minetest.get_node(pos).name == "air" then
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minetest.set_node(pos, {name = "asteroid:atmos"})
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end
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end)
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-- Generate on_generated function based on parameters
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function otherworlds.asteroids.create_on_generated(YMIN, YMAX, content_ids)
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local c_air = content_ids.c_air
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local c_stone = content_ids.c_stone
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local c_cobble = content_ids.c_cobble
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local c_gravel = content_ids.c_gravel
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local c_dust = content_ids.c_dust
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local c_ironore = content_ids.c_ironore
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local c_copperore = content_ids.c_copperore
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local c_goldore = content_ids.c_goldore
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local c_diamondore = content_ids.c_diamondore
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local c_meseore = content_ids.c_meseore
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local c_waterice = content_ids.c_waterice
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local c_atmos = content_ids.c_atmos
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local c_snowblock = content_ids.c_snowblock
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local c_obsidian = content_ids.c_obsidian
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-- return the function closed over the upvalues we want
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return function(minp, maxp, seed)
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if minp.x < XMIN or maxp.x > XMAX
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or minp.y < YMIN or maxp.y > YMAX
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or minp.z < ZMIN or maxp.z > ZMAX then
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return
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end
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local x0, y0, z0 = minp.x, minp.y, minp.z
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local x1, y1, z1 = maxp.x, maxp.y, maxp.z
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-- local t1 = os.clock()
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--print ("[asteroid] chunk ("..x0.." "..y0.." "..z0..")")
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local sidelen = x1 - x0 + 1 -- chunk side length
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local chulens = {x = sidelen, y = sidelen, z = sidelen}
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local minpos = {x = x0, y = y0, z = z0}
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local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
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local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
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local data = vm:get_data()
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local nvals1 = minetest.get_perlin_map(np_large, chulens):get_3d_map_flat(minpos)
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local nvals3 = minetest.get_perlin_map(np_fissure, chulens):get_3d_map_flat(minpos)
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local nvals4 = minetest.get_perlin_map(np_small, chulens):get_3d_map_flat(minpos)
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local nvals5 = minetest.get_perlin_map(np_ores, chulens):get_3d_map_flat(minpos)
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local nvals6 = minetest.get_perlin_map(np_latmos, chulens):get_3d_map_flat(minpos)
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local nvals7 = minetest.get_perlin_map(np_satmos, chulens):get_3d_map_flat(minpos)
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local ni = 1
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local noise1abs, noise4abs, comet, noise1dep, noise4dep, vi
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for z = z0, z1 do -- for each vertical plane do
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for y = y0, y1 do -- for each horizontal row do
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vi = area:index(x0, y, z) -- LVM index for first node in x row
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for x = x0, x1 do -- for each node do
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noise1abs = abs(nvals1[ni])
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noise4abs = abs(nvals4[ni])
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comet = false
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-- comet biome
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if nvals6[ni] < -(ASCOT + ATMOT)
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or (nvals7[ni] < -(SASCOT + ATMOT) and nvals1[ni] < ASCOT) then
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comet = true
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end
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-- if below surface
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if noise1abs > ASCOT or noise4abs > SASCOT then
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-- noise1dep zero at surface, positive beneath
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noise1dep = noise1abs - ASCOT
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-- if no fissure
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if abs(nvals3[ni]) > FISTS + noise1dep * FISEXP then
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-- noise4dep zero at surface, positive beneath
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noise4dep = noise4abs - SASCOT
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if not comet
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or (comet and (noise1dep > random() + ICET
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or noise4dep > random() + ICET)) then
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-- asteroid or asteroid materials in comet
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if noise1dep >= STOT or noise4dep >= STOT then
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-- stone/ores
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if random(ORECHA) == 1 then
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if nvals5[ni] > 0.6 then
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data[vi] = c_goldore
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elseif nvals5[ni] < -0.6 then
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data[vi] = c_diamondore
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elseif nvals5[ni] > 0.2 then
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data[vi] = c_meseore
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elseif nvals5[ni] < -0.2 then
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data[vi] = c_copperore
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else
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data[vi] = c_ironore
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end
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else
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data[vi] = c_stone
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end
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elseif noise1dep >= COBT or noise4dep >= COBT then
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data[vi] = c_cobble
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elseif noise1dep >= GRAT or noise4dep >= GRAT then
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data[vi] = c_gravel
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else
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data[vi] = c_dust
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end
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else -- comet materials
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if noise1dep >= ICET or noise4dep >= ICET then
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data[vi] = c_waterice
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else
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data[vi] = c_snowblock
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end
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end
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elseif comet then -- fissures, if comet then add atmosphere
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data[vi] = c_atmos
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end
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elseif comet then -- if comet atmosphere then
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data[vi] = c_atmos
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end
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ni = ni + 1
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vi = vi + 1
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end
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end
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end
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local cr, cx, cz, comet, surfy, vi, nr, nodeid
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-- craters
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for ci = 1, CPCHU do -- iterate
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-- exponential radius
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cr = CRMIN + floor(random() ^ 2 * CRRAN)
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cx = random(minp.x + cr, maxp.x - cr) -- centre x
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cz = random(minp.z + cr, maxp.z - cr) -- centre z
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comet = false
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surfy = false
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for y = y1, y0 + cr, -1 do
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vi = area:index(cx, y, cz) -- LVM index for node
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nodeid = data[vi]
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if nodeid == c_dust or nodeid == c_gravel or nodeid == c_cobble then
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surfy = y
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break
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elseif nodename == c_snowblock or nodename == c_waterice then
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comet = true
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surfy = y
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break
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end
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end
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-- if surface found and 8 node space above impact node then
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if surfy and y1 - surfy > 8 then
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for x = cx - cr, cx + cr do -- for each plane do
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for z = cz - cr, cz + cr do -- for each column do
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for y = surfy - cr, surfy + cr do -- for each node do
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-- LVM index for node
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vi = area:index(x, y, z)
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nr = ((x - cx) ^ 2 + (y - surfy) ^ 2 + (z - cz) ^ 2) ^ 0.5
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if nr <= cr - 2 then
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if comet then
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data[vi] = c_atmos
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else
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data[vi] = c_air
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end
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elseif nr <= cr - 1 then
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nodeid = data[vi]
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if nodeid == c_gravel or nodeid == c_cobble
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or nodeid == c_stone or nodeid == c_diamondore
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or nodeid == c_goldore or nodeid == c_meseore
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or nodeid == c_copperore or nodeid == c_ironore then
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data[vi] = c_dust
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end
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elseif nr <= cr then
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nodeid = data[vi]
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if nodeid == c_cobble or nodeid == c_stone then
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data[vi] = c_obsidian -- obsidian buried under dust
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end
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end
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end
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end
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end
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end
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end
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vm:set_data(data)
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vm:set_lighting({day = 0, night = 0})
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vm:calc_lighting()
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vm:write_to_map(data)
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-- local chugent = math.ceil((os.clock() - t1) * 1000)
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--print ("[asteroid] time "..chugent.." ms")
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data = nil
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end
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end
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