mirror of
https://gitlab.com/gaelysam/mapgen_rivers.git
synced 2024-11-14 06:40:21 +01:00
71 lines
2.0 KiB
Lua
71 lines
2.0 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 size = {x=1000, y=1000}
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local blocksize = 12
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local variation_speed = 70
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local np_base = {
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offset = 0,
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scale = 200,
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seed = 2469,
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octaves = 8,
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spread = {x=4000/blocksize, y=4000/blocksize, z=4000/blocksize},
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persist = 0.6,
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lacunarity = 2,
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}
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local time = 10
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local time_step = 1
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local niter = math.ceil(time/time_step)
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time_step = time / niter
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local function generate()
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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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--nobj_base:calc_3d_map({x=0, y=0, z=0})
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--local dem = nobj_base:get_map_slice({z=1}, {z=1})
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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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local model = EvolutionModel()
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model.dem = dem
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local ref_dem = model:define_isostasy(dem)
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local variation_step = variation_speed * time_step
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for i=1, niter do
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--nobj_base:get_map_slice({z=i+1}, {z=1}, ref_dem)
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nobj_base:get_3d_map_flat({x=0, y=variation_step*i, z=0}, ref_dem)
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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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model:isostasy()
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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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mapgen_rivers.write_map('dem', model.dem, 2)
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mapgen_rivers.write_map('lakes', model.lakes, 2)
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mapgen_rivers.write_map('dirs', model.dirs, 1)
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mapgen_rivers.write_map('rivers', model.rivers, 4)
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mapgen_rivers.write_map('offset_x', offset_x, 1)
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mapgen_rivers.write_map('offset_y', offset_y, 1)
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local sfile = io.open(mapgen_rivers.world_data_path .. 'size', "w")
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sfile:write(size.x..'\n'..size.y)
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sfile:close()
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end
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return generate
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