266 lines
7.2 KiB
Lua
266 lines
7.2 KiB
Lua
-- Parameters
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local pnum = 1 -- number of planets desired
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local maxatt = 128 -- maximum number of attempts to add a planet
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local np_terrain = {
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offset = 0,
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scale = 1.0,
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spread = {x = 96, y = 96, z = 96},
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seed = 921181,
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octaves = 3,
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persist = 0.5
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}
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local np_cloud = {
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offset = 0,
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scale = 1,
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spread = {x = 16, y = 16, z = 16},
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seed = 2113,
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octaves = 4,
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persist = 1.0
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}
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-- Do files
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dofile(minetest.get_modpath("planets") .. "/nodes.lua")
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-- Mapgen parameters
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minetest.set_mapgen_params({mgname = "singlenode",
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chunksize = 5, water_level = -31000, flags = "nolight"})
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-- Create pseudorandom galaxy
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-- space is 64 ^ 3 chunks, centred on world centre
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-- space table is flat array of planet ids or nil (vacuum chunk)
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local space = {}
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-- planet definition table indexed by planet id
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local def = {}
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local spzstr = 64 * 64 -- space array z stride
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local spystr = 64 -- space array y stride
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local plid = 0 -- planet id of last planet added, 0 = none
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local addatt = 0 -- number of attempts to add a planet
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while plid < pnum and addatt <= maxatt do -- avoid infinite attempts
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-- create initial planet data to check for obstruction
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-- cenx/y/z is planet centre
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-- radter = terrain radius / water level
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-- radmax = atmosphere radius or max mountain radius
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local cenx = 0
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local ceny = 0
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local cenz = 0
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local radter = 256
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local radmax = 384
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-- chunk co-ords of chunk containing planet centre
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-- measured from space origin (-32, -32, -32 chunks)
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local cenxcc = math.floor((cenx + 32) / 80) + 32
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local cenycc = math.floor((ceny + 32) / 80) + 32
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local cenzcc = math.floor((cenz + 32) / 80) + 32
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local radmaxc = math.ceil(radmax / 80) -- planet radius in chunks
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-- check space is clear for planet
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local clear = true -- is space clear
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print ("[planets] Checking for obstruction")
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for cz = cenzcc - radmaxc, cenzcc + radmaxc do
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for cy = cenycc - radmaxc, cenycc + radmaxc do
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local spi = cz * spzstr + cy * spystr + cenxcc - radmaxc + 1
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for cx = cenxcc - radmaxc, cenxcc + radmaxc do
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if space[spi] ~= nil then
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clear = false
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print ("[planets] Planet obstructed")
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break
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end
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spi = spi + 1
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end
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if not clear then
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break
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end
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end
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if not clear then
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break
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end
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end
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if clear then -- add planet
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-- TODO generate extra planet data
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plid = #def + 1 -- planet id
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-- add planet data to def table
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def[plid] = {i = cenx, j = ceny, k = cenz, t = radter, m = radmax}
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print ("[planets] Adding planet " .. plid)
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for cz = cenzcc - radmaxc, cenzcc + radmaxc do
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for cy = cenycc - radmaxc, cenycc + radmaxc do
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local spi = cz * spzstr + cy * spystr + cenxcc - radmaxc + 1
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for cx = cenxcc - radmaxc, cenxcc + radmaxc do
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space[spi] = plid -- add planet id to this chunk
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spi = spi + 1
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end
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end
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end
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end
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addatt = addatt + 1
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end
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-- Globalstep function
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local skybox_space = {
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"planets_skybox_space.png",
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"planets_skybox_space.png",
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"planets_skybox_space.png",
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"planets_skybox_space.png",
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"planets_skybox_space.png",
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"planets_skybox_space.png"
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}
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minetest.register_globalstep(function(dtime)
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for _, player in ipairs(minetest.get_connected_players()) do
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if math.random() < 0.05 then -- set gravity, skybox and override light
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local ppos = player:getpos()
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ppos.y = ppos.y + 1.5 -- node player head is in
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local nodename = minetest.get_node(ppos).name
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if nodename == "planets:vacuum" or nodename == "ignore" then -- space
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--player:set_physics_override(1, 1, 1) -- speed, jump, gravity
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player:set_sky({r = 0, g = 0, b = 0, a = 0}, "skybox", skybox_space)
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player:override_day_night_ratio(1)
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else -- regular sky for now
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--player:set_physics_override(1, 1, 1) -- speed, jump, gravity
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player:set_sky({}, "regular", {})
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player:override_day_night_ratio(nil)
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end
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end
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end
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end)
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-- Initialize noise objects to nil
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local nobj_terrain = nil
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local nobj_cloud = nil
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-- Localise noise buffers
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local nbuf_terrain
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local nbuf_cloud
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-- On generated function
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minetest.register_on_generated(function(minp, maxp, seed)
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local t0 = os.clock()
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local x0 = minp.x
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local y0 = minp.y
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local z0 = minp.z
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local x1 = maxp.x
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local y1 = maxp.y
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local z1 = maxp.z
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-- chunk co-ords of chunk
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-- measured from space origin (-32, -32, -32 chunks)
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local cx0 = math.floor((x0 + 32) / 80) + 32
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local cy0 = math.floor((y0 + 32) / 80) + 32
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local cz0 = math.floor((z0 + 32) / 80) + 32
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-- space table index
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local spi = cz0 * spzstr + cy0 * spystr + cx0 + 1
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-- planet def table index
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local defi = space[spi]
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-- planet def
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local pdef = def[defi]
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local c_air = minetest.get_content_id("air")
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local c_lava = minetest.get_content_id("planets:lava")
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local c_stone = minetest.get_content_id("planets:stone")
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local c_water = minetest.get_content_id("planets:water")
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local c_cloud = minetest.get_content_id("planets:cloud")
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local c_vacuum = minetest.get_content_id("planets:vacuum")
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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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if pdef then -- planet chunk
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local pmapdims = {x = 80, y = 80, z = 80} -- perlinmap dimensions
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local pmapminp = {x = x0, y = y0, z = z0} -- perlinmap minp
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local pmapdimsclo = {x = 5, y = 5, z = 5} -- cloud perlinmap dimensions
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local pmapminpclo = {x = x0 / 16, y = y0 / 16, z = z0 / 16} -- cloud perlinmap minp
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nobj_terrain = nobj_terrain or minetest.get_perlin_map(np_terrain, pmapdims)
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nobj_cloud = nobj_cloud or minetest.get_perlin_map(np_cloud, pmapdimsclo)
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local nvals_terrain = nobj_terrain:get3dMap_flat(pmapminp, nbuf_terrain)
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local nvals_cloud = nobj_cloud:get3dMap_flat(pmapminpclo, nbuf_cloud)
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local tersca = (pdef.m - pdef.t) / 2 -- terrain scale
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local ni = 1 -- noise index
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for z = z0, z1 do
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for y = y0, y1 do
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local vi = area:index(x0, y, z) -- luavoxelmanip index
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for x = x0, x1 do
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local nodrad = math.sqrt((x - pdef.i) ^ 2 + -- node radius
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(y - pdef.j) ^ 2 + (z - pdef.k) ^ 2)
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local dengrad = (pdef.t - nodrad) / tersca -- density gradient
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local dennoise = nvals_terrain[ni] -- density noise
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if nodrad <= pdef.t then -- make oceans shallower
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dennoise = dennoise / 2
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end
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local density = dennoise + dengrad -- density
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if nodrad <= pdef.t / 2 then -- lava
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data[vi] = c_lava
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elseif density >= 0 then -- stone
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data[vi] = c_stone
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elseif nodrad <= pdef.t then -- water
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data[vi] = c_water
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elseif dengrad >= -1.0 and dengrad <= -0.95 then -- clouds
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local xq = math.floor((x - x0) / 16) -- quantise position
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local yq = math.floor((y - y0) / 16)
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local zq = math.floor((z - z0) / 16)
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local niq = zq * 25 + yq * 5 + xq + 1
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if nvals_cloud[niq] > 0.5 then
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data[vi] = c_cloud
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end
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elseif nodrad <= pdef.m then -- air
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data[vi] = c_air
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else -- vacuum
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data[vi] = c_vacuum
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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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else -- vacuum chunk
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for z = z0, z1 do
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for y = y0, y1 do
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local vi = area:index(x0, y, z)
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for x = x0, x1 do
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data[vi] = c_vacuum
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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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end
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vm:set_data(data)
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if pdef then
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vm:calc_lighting()
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else -- vacuum chunk, don't propagate shadow
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vm:calc_lighting(nil, nil, false)
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end
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vm:write_to_map(data)
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local chugent = math.ceil((os.clock() - t0) * 1000)
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print ("[planets] Generated chunk " .. chugent .. " ms")
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end)
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