Available since LÖVE 0.8.0
This method is not supported in earlier versions.
Sets a function for collision filtering.
If the group and category filtering doesn't generate a collision decision, this function gets called with the two fixtures as arguments. The function should return a boolean value where true means the fixtures will collide and false means they will pass through each other.
World:setContactFilter( filter )
function filter
Nothing.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://love2d.org/wiki/World:setContactFilter