mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-12-02 20:13:54 +01:00
90 lines
2.7 KiB
Lua
90 lines
2.7 KiB
Lua
local wea = worldeditadditions
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local wea_c = worldeditadditions_core
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local Vector3 = wea_c.Vector3
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wea.conv = {}
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dofile(wea.modpath.."/lib/conv/kernels.lua")
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dofile(wea.modpath.."/lib/conv/kernel_gaussian.lua")
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dofile(wea.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 wea.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, wea.conv.kernel_box(width, height)
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elseif name == "pascal" then
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return true, wea.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 = wea.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 wea.convolve(pos1, pos2, kernel, kernel_size)
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pos1, pos2 = worldedit.sort_pos(pos1, pos2)
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local border_size = Vector3.new(
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(kernel_size.x-1) / 2, -- x = height
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0,
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(kernel_size.z-1) / 2 -- z = width
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)
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pos1.z = pos1.z - border_size.x
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pos2.z = pos2.z + border_size.x
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pos1.x = pos1.x - border_size.z
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pos2.x = pos2.x + border_size.z
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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 = wea_c.terrain.make_heightmap(pos1, pos2, manip, area, data)
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local heightmap_conv = wea_c.table.shallowcopy(heightmap)
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wea.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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-- wea.format.array_2d(heightmap, (pos2.z - pos1.z) + 1)
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-- print("transformed")
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-- wea.format.array_2d(heightmap_conv, (pos2.z - pos1.z) + 1)
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wea_c.terrain.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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