Minetest-WorldEditAdditions/worldeditadditions/lib/noiseapply2d.lua

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local wea_c = worldeditadditions_core
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local Vector3 = wea_c.Vector3
---
-- @module worldeditadditions
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-- ███ ██ ██████ ██ ███████ ███████ █████ ██████ ██████ ██ ██ ██ ██████ ██████
-- ████ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
-- ██ ██ ██ ██ ██ ██ ███████ █████ ███████ ██████ ██████ ██ ████ █████ ██ ██
-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
-- ██ ████ ██████ ██ ███████ ███████ ██ ██ ██ ██ ███████ ██ ███████ ██████
--- Similar to cubeapply, except that it takes 2 positions and randomly keeps changes based on a noise pattern.
-- Takes a backup copy of the defined region, runs the given function, and then
-- restores the bits that aren't above the noise threshold.
-- @param pos1 Vector3 The 1st position defining the region boundary
-- @param pos2 Vector3 The 2nd positioon defining the region boundary
-- @param func function The function to call that performs the action in question. It is expected that the given function will accept no arguments.
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function worldeditadditions.noiseapply2d(pos1, pos2, threshold, scale, func)
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local time_taken_all = wea_c.get_ms_time()
pos1, pos2 = Vector3.sort(pos1, pos2)
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if not threshold then threshold = 0.5 end
-- pos2 will always have the highest co-ordinates now
-- Fetch the nodes in the specified area
local manip_before, area_before = worldedit.manip_helpers.init(pos1, pos2)
local data_before = manip_before:get_data()
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local time_taken_fn = wea_c.get_ms_time()
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func()
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time_taken_fn = wea_c.get_ms_time() - time_taken_fn
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local manip_after, area_after = worldedit.manip_helpers.init(pos1, pos2)
local data_after = manip_after:get_data()
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local size2d = pos2 - pos1 + Vector3.new(1, 1, 1)
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-- print("DEBUG pos1", pos1, "pos2", pos2, "size2d", size2d)
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local success, noise = worldeditadditions.noise.make_2d(size2d, pos1, {
algorithm = "perlinmt",
scale = scale
})
if not success then return success, noise end
for z = pos2.z, pos1.z, -1 do
for y = pos2.y, pos1.y, -1 do
for x = pos2.x, pos1.x, -1 do
local i_before = area_before:index(x, y, z)
local i_after = area_after:index(x, y, z)
local i_noise = (z-pos1.z)*size2d.x + (x-pos1.x)
-- Roll everything where the noise function returns less than 0.5
if noise[i_noise] < threshold then
data_after[i_after] = data_before[i_before]
end
end
end
end
-- Save the modified nodes back to disk & return
-- No need to save - this function doesn't actually change anything
worldedit.manip_helpers.finish(manip_after, data_after)
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time_taken_all = wea_c.get_ms_time() - time_taken_all
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return true, { all = time_taken_all, fn = time_taken_fn }
end