84 lines
2.8 KiB
Lua
84 lines
2.8 KiB
Lua
worldeditadditions.conv = {}
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dofile(worldeditadditions.modpath.."/lib/conv/kernels.lua")
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dofile(worldeditadditions.modpath.."/lib/conv/kernel_gaussian.lua")
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dofile(worldeditadditions.modpath.."/lib/conv/convolve.lua")
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--- Creates a new kernel.
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-- Note that the gaussian kernel only allows for creating a square kernel.
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-- arg is only used by the gaussian kernel as the sigma value (default: 2)
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-- @param name string The name of the kernel to create (possible values: box, pascal, gaussian).
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-- @param width number The width of the kernel to create (must be an odd integer).
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-- @param height number The height of the kernel to create (must be an odd integer).
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-- @param arg number The argument to pass when creating the kernel. Currently only used by gaussian kernel as the sigma value.
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function worldeditadditions.get_conv_kernel(name, width, height, arg)
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if width % 2 ~= 1 then
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return false, "Error: The width must be an odd integer.";
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end
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if height % 2 ~= 1 then
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return false, "Error: The height must be an odd integer";
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end
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if name == "box" then
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return true, worldeditadditions.conv.kernel_box(width, height)
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elseif name == "pascal" then
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return true, worldeditadditions.conv.kernel_pascal(width, height, true)
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elseif name == "gaussian" then
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if width ~= height then
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return false, "Error: When using a gaussian kernel the width and height must be identical."
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end
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-- Default to sigma = 2
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if arg == nil then arg = 2 end
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local success, result = worldeditadditions.conv.kernel_gaussian(width, arg)
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return success, result
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end
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return false, "Error: Unknown kernel. Valid values: box, pascal, gaussian"
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end
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function worldeditadditions.convolve(pos1, pos2, kernel, kernel_size)
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pos1, pos2 = worldedit.sort_pos(pos1, pos2)
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local border_size = {}
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border_size[0] = (kernel_size[0]-1) / 2 -- height
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border_size[1] = (kernel_size[1]-1) / 2 -- width
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pos1.z = pos1.z - border_size[0]
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pos2.z = pos2.z + border_size[0]
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pos1.x = pos1.x - border_size[1]
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pos2.x = pos2.x + border_size[1]
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local manip, area = worldedit.manip_helpers.init(pos1, pos2)
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local data = manip:get_data()
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local stats = { added = 0, removed = 0 }
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local node_id_air = minetest.get_content_id("air")
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local heightmap, heightmap_size = worldeditadditions.make_heightmap(pos1, pos2, manip, area, data)
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local heightmap_conv = worldeditadditions.shallowcopy(heightmap)
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worldeditadditions.conv.convolve(
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heightmap_conv,
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heightmap_size,
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kernel,
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kernel_size
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)
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-- print("original")
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-- worldeditadditions.print_2d(heightmap, (pos2.z - pos1.z) + 1)
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-- print("transformed")
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-- worldeditadditions.print_2d(heightmap_conv, (pos2.z - pos1.z) + 1)
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worldeditadditions.apply_heightmap_changes(
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pos1, pos2, area, data,
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heightmap, heightmap_conv, heightmap_size
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)
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worldedit.manip_helpers.finish(manip, data)
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return true, stats
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end
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