Available since LÖVE 0.8.0  
 This method is not supported in earlier versions. 
Sets the categories the fixture belongs to. There can be up to 16 categories represented as a number from 1 to 16.
Fixture:setCategory( category1, category2, ... )
Nothing.
 
    © 2006–2016 LÖVE Development Team
Licensed under the GNU Free Documentation License, Version 1.3.
    https://love2d.org/wiki/Fixture:setCategory