Minetest-WorldEditAdditions/worldeditadditions/lib/conv/conv.lua

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local wea = worldeditadditions
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local wea_c = worldeditadditions_core
local Vector3 = wea_c.Vector3
wea.conv = {}
dofile(wea.modpath.."/lib/conv/kernels.lua")
dofile(wea.modpath.."/lib/conv/kernel_gaussian.lua")
dofile(wea.modpath.."/lib/conv/convolve.lua")
--- Creates a new kernel.
-- Note that the gaussian kernel only allows for creating a square kernel.
-- arg is only used by the gaussian kernel as the sigma value (default: 2)
-- @param name string The name of the kernel to create (possible values: box, pascal, gaussian).
-- @param width number The width of the kernel to create (must be an odd integer).
-- @param height number The height of the kernel to create (must be an odd integer).
-- @param arg number The argument to pass when creating the kernel. Currently only used by gaussian kernel as the sigma value.
function wea.get_conv_kernel(name, width, height, arg)
if width % 2 ~= 1 then
return false, "Error: The width must be an odd integer.";
end
if height % 2 ~= 1 then
return false, "Error: The height must be an odd integer";
end
if name == "box" then
return true, wea.conv.kernel_box(width, height)
elseif name == "pascal" then
return true, wea.conv.kernel_pascal(width, height, true)
elseif name == "gaussian" then
if width ~= height then
return false, "Error: When using a gaussian kernel the width and height must be identical."
end
-- Default to sigma = 2
if arg == nil then arg = 2 end
local success, result = wea.conv.kernel_gaussian(width, arg)
return success, result
end
return false, "Error: Unknown kernel. Valid values: box, pascal, gaussian"
end
function wea.convolve(pos1, pos2, kernel, kernel_size)
pos1, pos2 = worldedit.sort_pos(pos1, pos2)
local border_size = Vector3.new(
(kernel_size.x-1) / 2, -- x = height
0,
(kernel_size.z-1) / 2 -- z = width
)
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pos1.z = pos1.z - border_size.x
pos2.z = pos2.z + border_size.x
pos1.x = pos1.x - border_size.z
pos2.x = pos2.x + border_size.z
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local manip, area = worldedit.manip_helpers.init(pos1, pos2)
local data = manip:get_data()
local stats = { added = 0, removed = 0 }
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)
local heightmap_conv = wea_c.table.shallowcopy(heightmap)
wea.conv.convolve(
heightmap_conv,
heightmap_size,
kernel,
kernel_size
)
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-- print("original")
-- wea.format.array_2d(heightmap, (pos2.z - pos1.z) + 1)
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-- print("transformed")
-- wea.format.array_2d(heightmap_conv, (pos2.z - pos1.z) + 1)
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wea_c.terrain.apply_heightmap_changes(
pos1, pos2, area, data,
heightmap, heightmap_conv, heightmap_size
)
worldedit.manip_helpers.finish(manip, data)
return true, stats
end