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