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MisterE
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(C) MisterE 2022
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MIT license
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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local function remap(val, min_val, max_val, min_map, max_map)
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return (val-min_val)/(max_val-min_val) * (max_map-min_map) + min_map
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end
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local function lerp(var_a, var_b, ratio)
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return (1-ratio)*var_a + (ratio*var_b)
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end
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-- karst height controls, if a heightmap is provided by mapgen then that is used for max height
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local min_height = -2000
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local fallback_max_height = 50
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-- 2d, low only
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local np_caverns_connector_x = {
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offset = -.75,
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scale = 2,
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spread = {x=30, y=5, z=4},
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octaves = 3,
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seed = 20000,
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persist = 0.4,
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lacunarity = 2,
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}
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-- 2d, low only
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local np_caverns_connector_z = {
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offset = -.75, -- lowering makes
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scale = 2,
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spread = {x=5, y=30, z=30},
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octaves = 3,
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seed = 20000,
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persist = 0.4,
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lacunarity = 2,
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}
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-- 2d, low only
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local np_caverns_rooms = {
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offset = 1.25,
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scale = 2,
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spread = {x=20, y=20, z=20},
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octaves = 2,
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persist = .2,
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lacunarity = 4,
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}
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-- 2d, low only, a large scale noise that prevents cavern formation in large areas
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local np_caverns_region = {
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offset = -.3,
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scale = 1,
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spread = {x=100, y=100, z=100},
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octaves = 6,
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persist = 0.4,
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lacunarity = 1,
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}
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local np_caverns_modulator = {
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offset = 0,
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scale = 1.3,
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spread = {x=120, y=25, z=120},
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octaves = 4,
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persist = .5,
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lacunarity = 2.5,
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}
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local np_caverns_rooms_modulator = {
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offset = 0,
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scale = 1.5,
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spread = {x=60, y=13, z=60},
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octaves = 3,
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persist = .5,
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lacunarity = 2.5,
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}
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local c_air = minetest.get_content_id("air")
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local c_stone = minetest.get_content_id("default:stone")
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local nobj_caverns_modulator = nil
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local nvals_caverns_modulator = {}
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local nobj_caverns_rooms_modulator = nil
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local nvals_caverns_rooms_modulator = {}
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local data = {}
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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 heightmap = minetest.get_mapgen_object("heightmap")
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local sidelen = maxp.x - minp.x + 1
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local permapdims3d = {x = sidelen, y = sidelen, z = sidelen}
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nobj_caverns_modulator = nobj_caverns_modulator or
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minetest.get_perlin_map(np_caverns_modulator, permapdims3d)
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nobj_caverns_modulator:get3dMap_flat(minp, nvals_caverns_modulator)
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nobj_caverns_rooms_modulator = nobj_caverns_rooms_modulator or
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minetest.get_perlin_map(np_caverns_rooms_modulator, permapdims3d)
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nobj_caverns_rooms_modulator:get3dMap_flat(minp, nvals_caverns_rooms_modulator)
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local nvals_caverns_connector_x = minetest.get_perlin_map(np_caverns_connector_x, permapdims3d):get2dMap_flat({x=minp.x, y=minp.z})
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local nvals_caverns_connector_z = minetest.get_perlin_map(np_caverns_connector_z, permapdims3d):get2dMap_flat({x=minp.x, y=minp.z})
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local nvals_caverns_caverns_rooms = minetest.get_perlin_map(np_caverns_rooms, permapdims3d):get2dMap_flat({x=minp.x, y=minp.z})
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local nvals_caverns_region = minetest.get_perlin_map(np_caverns_region, permapdims3d):get2dMap_flat({x=minp.x, y=minp.z})
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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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vm:get_data(data)
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local ni = 1
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for z = minp.z, maxp.z do
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for y = minp.y, maxp.y do
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local vi = area:index(minp.x, y, z)
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for x = minp.x, maxp.x do
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local pos = vector.new(x,y,z)
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local hm_i = (pos.x - minp.x + 1) + (((pos.z - minp.z)) * 80)
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local height
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if heightmap then
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height = heightmap[hm_i]
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else
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height = fallback_max_height
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end
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local caverns_caverns_rooms = nvals_caverns_caverns_rooms[hm_i]
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local caverns_region = nvals_caverns_region[hm_i]
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local surface_break_adder = 1.5
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if y > min_height and y < height - (surface_break_adder) + caverns_caverns_rooms and y > height - (75 + caverns_region) and caverns_region > .2 then
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local caverns_connector_x = nvals_caverns_connector_x[hm_i]
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local caverns_connector_z = nvals_caverns_connector_z[hm_i]
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local density_caverns_modulator = nvals_caverns_modulator[ni]*.5 --+ .75
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local density_caverns_rooms_modulator = nvals_caverns_rooms_modulator[ni]*.5
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density_caverns_modulator = remap(density_caverns_modulator,-2,2,-20,20)
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if (density_caverns_modulator < 2.8 and density_caverns_modulator > 1
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and (
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lerp(lerp(caverns_connector_x - .9,lerp(density_caverns_rooms_modulator,density_caverns_rooms_modulator,.8) ,.4),density_caverns_rooms_modulator,.3) > 0
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or lerp(lerp(caverns_connector_z - .9,lerp(density_caverns_rooms_modulator,density_caverns_rooms_modulator,.8) ,.4),density_caverns_rooms_modulator,.3) > 0
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))
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or (density_caverns_modulator > 2.5
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and lerp(density_caverns_rooms_modulator - .3,1-caverns_caverns_rooms -.4,.4) > 0
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)
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then
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data[vi] = c_air
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end
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end
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-- if math.random(1,100) == 1 then
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-- minetest.chat_send_all(caverns_region)
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-- end
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-- Increment noise index.
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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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vm:set_data(data)
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vm:calc_lighting()
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vm:write_to_map()
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vm:update_liquids()
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end)
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