Available since LÖVE 0.8.0
This method is not supported in earlier versions.
Associates a Lua value with the fixture.
To delete the reference, explicitly pass nil.
Use this function in one thread and one thread only. Using it in more threads will make Lua cry and most likely crash.
Fixture:setUserData( value )
mixed value
Nothing.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://love2d.org/wiki/Fixture:setUserData