mirror of
https://gitlab.com/gaelysam/mapgen_rivers.git
synced 2024-12-28 20:00:41 +01:00
6564d40b85
Move grid management functions out of polygons.lua, in a new file called gridmanager.lua Explicitly call other files and grid management functions from init.lua to make workflow more apparent Move mapgen loop out of init.lua, into mapgen.lua
114 lines
3.0 KiB
Lua
114 lines
3.0 KiB
Lua
local EvolutionModel = dofile(mapgen_rivers.modpath .. '/terrainlib_lua/erosion.lua')
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local twist = dofile(mapgen_rivers.modpath .. '/terrainlib_lua/twist.lua')
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local blocksize = mapgen_rivers.settings.blocksize
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local tectonic_speed = mapgen_rivers.settings.tectonic_speed
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local np_base = table.copy(mapgen_rivers.noise_params.base)
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np_base.spread = vector.divide(np_base.spread, blocksize)
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local evol_params = mapgen_rivers.settings.evol_params
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local time = mapgen_rivers.settings.evol_time
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local time_step = mapgen_rivers.settings.evol_time_step
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local niter = math.ceil(time/time_step)
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time_step = time / niter
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local use_margin = mapgen_rivers.settings.margin
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local margin_width = mapgen_rivers.settings.margin_width / blocksize
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local margin_elev = mapgen_rivers.settings.margin_elev
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local function margin(dem, width, elev)
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local X, Y = dem.X, dem.Y
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for i=1, width do
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local c1 = ((i-1)/width) ^ 0.5
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local c2 = (1-c1) * elev
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local index = (i-1)*X + 1
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for x=1, X do
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dem[index] = dem[index] * c1 + c2
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index = index + 1
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end
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index = i
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for y=1, Y do
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dem[index] = dem[index] * c1 + c2
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index = index + X
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end
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index = X*(Y-i) + 1
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for x=1, X do
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dem[index] = dem[index] * c1 + c2
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index = index + 1
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end
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index = X-i + 1
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for y=1, Y do
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dem[index] = dem[index] * c1 + c2
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index = index + X
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end
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end
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end
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function mapgen_rivers.pregenerate(grid)
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local size = grid.size
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if size.x * size.y > 4e6 then
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minetest.log("warning", "[mapgen_rivers] You are going to generate a very large grid (>4M nodes). If you experience problems, you should increase blocksize or reduce map size.")
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end
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local seed = tonumber(minetest.get_mapgen_setting("seed"))
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np_base.seed = (np_base.seed or 0) + seed
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local nobj_base = PerlinNoiseMap(np_base, {x=size.x, y=1, z=size.y})
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local dem = nobj_base:get_3d_map_flat({x=0, y=0, z=0})
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dem.X = size.x
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dem.Y = size.y
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if use_margin then
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margin(dem, margin_width, margin_elev)
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end
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local model = EvolutionModel(evol_params)
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model.dem = dem
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local ref_dem = model:define_isostasy(dem)
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local tectonic_step = tectonic_speed * time_step
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collectgarbage()
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for i=1, niter do
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minetest.log("info", "[mapgen_rivers] Iteration " .. i .. " of " .. niter)
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model:diffuse(time_step)
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model:flow()
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model:erode(time_step)
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if i < niter then
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if tectonic_step ~= 0 then
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nobj_base:get_3d_map_flat({x=0, y=tectonic_step*i, z=0}, ref_dem)
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if use_margin then
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margin(ref_dem, margin_width, margin_elev)
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end
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end
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model:isostasy()
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end
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collectgarbage()
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end
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model:flow()
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local mfloor = math.floor
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local mmin, mmax = math.min, math.max
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local offset_x, offset_y = twist(model.dirs, model.rivers, 5)
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for i=1, size.x*size.y do
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offset_x[i] = mmin(mmax(offset_x[i]*256, -128), 127)
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offset_y[i] = mmin(mmax(offset_y[i]*256, -128), 127)
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end
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grid.dem = model.dem
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grid.lakes = model.lakes
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grid.dirs = model.dirs
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grid.rivers = model.rivers
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grid.offset_x = offset_x
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grid.offset_y = offset_y
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grid.load_method = "full"
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grid.conv_applied = false
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collectgarbage()
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end
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