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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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Starbeamrainbowlabs
9b9a471aa8
Next we need to implement a worldedit function to handle fetching the manip data, calculating the heightmap, pushing it through this convolutional system, and saving the changes back again.
44 lines
1.5 KiB
Lua
44 lines
1.5 KiB
Lua
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--[[
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Convolves over a given 2D heightmap with a given matrix.
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Note that this *mutates* the given heightmap.
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Note also that the dimensions of the matrix must *only* be odd.
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@param {number[]} heightmap The 2D heightmap to convolve over.
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@param {[number,number]} heightmap_size The size of the heightmap as [ height, width ]
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@param {number[]} matrix The matrix to convolve with.
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@param {[number, number]} matrix_size The size of the convolution matrix as [ height, width ]
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]]--
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function worldeditadditions.conv.convole(heightmap, heightmap_size, matrix, matrix_size)
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if matrix_size[0] % 2 ~= 1 or matrix_size[1] % 2 ~= 1 then
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return false, "Error: The matrix size must contain only odd numbers (even number detected)"
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end
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local border_size = {
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(matrix_size[0]-1) / 2, -- height
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(matrix_size[1]-1) / 2 -- width
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}
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-- Convolve over only the bit that allows us to use the full convolution matrix
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for y = heightmap_size[0] - border_size[0], border_size[0], -1 do
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for x = heightmap_size[1] - border_size[1], border_size[1], -1 do
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local total = 0
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for my = matrix_size[0], 0, -1 do
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for mx = matrix_size[1], 0, -1 do
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local mi = (my * matrix_size[1]) + mx
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local cy = y + (my - border_size[0])
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local cx = x + (mx - border_size[1])
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local i = (cy * heightmap_size[1]) + cx
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total = total + matrix[mi] * heightmap[i]
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end
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end
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heightmap[(y * heightmap_size[1]) + x] = total
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end
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end
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return true, heightmap
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end
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