first pass of bubble caves
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FaceDeer
parent
dd0468b376
commit
476f8a7b89
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local modpath = minetest.get_modpath(minetest.get_current_modname())
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local mapgen_test_path = minetest.get_modpath("mapgen_test")
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--local S = minetest.get_translator(minetest.get_current_modname())
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local c_air = minetest.get_content_id("air")
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local c_glow
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if minetest.get_modpath("df_underworld_items") then
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c_glow = minetest.get_content_id("df_underworld_items:glowstone")
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end
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local perlin_params = {
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offset = 0,
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scale = 1,
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spread = {x=1000, y=500, z=1000},
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seed = 501221,
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octaves = 3,
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persist = 0.67
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}
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local data = {}
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local light_data = {}
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local light = 15 + (15 * 16)
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local max_depth = -5000
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local min_depth = -6000
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local noise_obj
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local block_size = 80
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local cube_inside = 1/math.sqrt(3) -- https://www.quora.com/What-is-the-largest-volume-of-a-cube-that-can-be-enclosed-in-a-sphere-of-diameter-2
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local get_bubbles = function(pos)
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noise_obj = noise_obj or minetest.get_perlin(perlin_params)
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local bubbles = {}
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local next_seed = math.random(1000000)
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for block_x = -1, 1 do
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for block_y = -1, 1 do
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for block_z = -1, 1 do
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local this_pos = vector.add(pos, {x=block_x*block_size, y=block_y*block_size, z=block_z*block_size})
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math.randomseed(this_pos.x + this_pos.y*8 + this_pos.z*16)
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this_pos.x = this_pos.x + math.floor(math.random()*block_size - block_size/2)
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this_pos.y = this_pos.y + math.floor(math.random()*block_size - block_size/2)
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this_pos.z = this_pos.z + math.floor(math.random()*block_size - block_size/2)
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local noise_val = math.min(noise_obj:get_3d(this_pos), 1.0)
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if noise_val > 0 then
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local radius = noise_val*block_size*math.random()+5
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local y = this_pos.y
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if y + radius < max_depth and y - radius > min_depth then -- make sure bubbles remain within the layer
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if mapgen_test_path then
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if noise_val < 0.1 then
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mapgen_test.record_first_location("bubble cave sparse", this_pos, "a bubble cave in a sparsely populated region")
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elseif noise_val < 0.55 and noise_val > 0.45 then
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mapgen_test.record_first_location("bubble cave middle", this_pos, "a bubble cave in a middlingly populated region")
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elseif noise_val > 0.9 then
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mapgen_test.record_first_location("bubble cave dense", this_pos, "a bubble cave in a densely populated region")
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end
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end
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table.insert(bubbles, {loc=this_pos, radius=radius})
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end
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end
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end
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end
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end
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math.randomseed(next_seed)
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return bubbles
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end
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if mapgen_test_path then
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mapgen_test.log_time_settings("bubble_caves")
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end
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minetest.register_on_generated(function(minp, maxp, seed)
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if minp.y > max_depth or maxp.y < min_depth then
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return
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end
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local nearby_bubbles = get_bubbles({x=minp.x+block_size/2, y=minp.y+block_size/2, z=minp.z+block_size/2})
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if not next(nearby_bubbles) then
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return
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end
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if mapgen_test_path then
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mapgen_test.log_time_start("bubble_caves")
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end
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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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vm:set_lighting({day = 0, night = 0})
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vm:get_light_data(light_data)
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for vi, x, y, z in area:iterp_xyz(emin, emax) do
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for _, bubble in pairs(nearby_bubbles) do
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if data[vi] ~= c_air then
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local loc = bubble.loc
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local loc_x = loc.x
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local loc_y = loc.y
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local loc_z = loc.z
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local radius = bubble.radius
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-- check outer bounding box first, faster than true distance
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if x <= loc_x + radius and x >= loc_x - radius and y <= loc_y + radius and y >= loc_y - radius and z <= loc_z + radius and z >= loc_z - radius then
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local inner_box = radius * cube_inside
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if (x <= loc_x + inner_box and x >= loc_x - inner_box and y <= loc_y + inner_box and y >= loc_y - inner_box and z <= loc_z + inner_box and z >= loc_z - inner_box)
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or vector.distance({x=x, y=y, z=z}, loc) < radius+math.random()/2 then
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data[vi] = c_air
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light_data[vi] = light
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end
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end
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end
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end
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end
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if c_glow then
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for _, bubble in pairs(nearby_bubbles) do
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local loc = bubble.loc
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if area:containsp(loc) then
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local vol = math.floor(bubble.radius / 20)
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if vol > 0 then
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for vi in area:iter(loc.x-vol, loc.y-vol, loc.z-vol, loc.x+vol, loc.y+vol, loc.z+vol) do
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if area:containsi(vi) then
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data[vi] = c_glow
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end
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end
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else
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data[area:indexp(loc)] = c_glow
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end
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end
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end
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end
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--send data back to voxelmanip
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vm:set_data(data)
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--calc lighting
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vm:set_light_data(light_data)
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vm:calc_lighting()
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vm:update_liquids()
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--write it to world
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vm:write_to_map()
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if mapgen_test_path then
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mapgen_test.log_time_stop("bubble_caves")
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end
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end)
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@ -0,0 +1,4 @@
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name = bubble_caves
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description = Inserts foamy spherical bubble caves in a layer underground
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depends = mapgen_helper
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optional_depends = mapgen_test, df_underworld_items
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