dfcaverns/chasms/init.lua

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2021-03-23 06:33:05 +01:00
local data = {}
local maxy = tonumber(minetest.settings:get("chasms_maxy")) or -50
local miny = tonumber(minetest.settings:get("chasms_miny")) or -3000
local falloff = tonumber(minetest.settings:get("chasms_falloff")) or 100
local chasms_threshold = tonumber(minetest.settings:get("chasms_threshold")) or 1.0
local np_chasms_default = {
offset = 0,
scale = 1,
spread = {x = 75, y = 500, z = 2000},
seed = 94586,
octaves = 2,
persist = 0.63,
lacunarity = 2.0,
}
local np_chasms = minetest.settings:get_np_group("chasms_params") or np_chasms_default
-- For some reason, these numbers are returned as strings by get_np_group.
local tonumberize_params = function(params)
params.scale = tonumber(params.scale)
params.lacunarity = tonumber(params.lacunarity)
params.spread.x = tonumber(params.spread.x)
params.spread.y = tonumber(params.spread.y)
params.spread.z = tonumber(params.spread.z)
params.offset = tonumber(params.offset)
params.persistence = tonumber(params.persistence)
end
tonumberize_params(np_chasms)
local nobj_chasm
local chasm_data = {}
local waver_strength = 8
local waver_vector = {x=waver_strength, y=0, z=0}
local np_waver = {
offset = 0,
scale = waver_strength,
spread = {x = 50, y = 50, z = 50},
seed = 49585,
octaves = 2,
persist = 0.63,
lacunarity = 2.0,
}
local nobj_waver
local waver_data = {}
local minfalloff = miny + falloff
local maxfalloff = maxy - falloff
local get_intensity = function(y)
if y < miny or y > maxy then
return 0
end
if y <= maxfalloff and y >= minfalloff then
return 1
end
if y < minfalloff then
return (y-miny)/falloff
end
-- if y > maxfalloff then
return (maxy-y)/falloff
-- end
end
local c_air = minetest.get_content_id("air")
minetest.register_on_generated(function(minp, maxp, seed)
if minp.y >= maxy or maxp.y <= miny then
return
end
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
vm:get_data(data)
nobj_chasm = nobj_chasm or minetest.get_perlin_map(np_chasms, {x = emax.x - emin.x + 1 + waver_strength*2, y = emax.y - emin.y + 1, z = emax.z - emin.z + 1})
nobj_chasm:get_3d_map_flat(vector.subtract(emin, waver_vector), chasm_data)
nobj_waver = nobj_waver or minetest.get_perlin_map(np_waver, {x = emax.x - emin.x + 1, y = emax.y - emin.y + 1, z = emax.z - emin.z + 1})
nobj_waver:get_3d_map_flat(emin, waver_data)
local chasm_area = VoxelArea:new{MinEdge = vector.subtract(emin, waver_vector), MaxEdge = vector.add(emax, waver_vector)}
local data_area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
-- local count = {}
for i, x, y, z in data_area:iterp_xyz(minp, maxp) do
local waver = math.min(math.max(math.floor(waver_data[i]+0.5), -waver_strength), waver_strength)
-- count[waver] = (count[waver] or 0) + 1
local intensity = get_intensity(y)
if chasm_data[chasm_area:index(x+waver, y, z)]*intensity > chasms_threshold then
data[i] = c_air
end
end
vm:set_data(data)
vm:calc_lighting()
vm:write_to_map()
-- minetest.debug(dump(count))
end)