Minetest-WorldEditAdditions/worldeditadditions/lib/sculpt/brushes/square.lua

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--- Returns a simple square brush with 100% weight for every pixel.
return function(size)
local result = {}
for y=0, size.y do
for x=0, size.x do
result[y*size.x + x] = 1
end
end
return true, result, size
end