If we don't occlusion test a primitive for r.GFramesNotOcclusionTestedToExpandBBoxes frames, then we expand the BBox when we do occlusion test it for a few frames by this amount. See also r.FramesToExpandNewlyOcclusionTestedBBoxes, r.GFramesNotOcclusionTestedToExpandBBoxes.
Usage
r.ExpandNewlyOcclusionTestedBBoxesAmount [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
