Update: add ability to step through higher levels of mip chain to reconfirm visibility - controlled via culling.extralodsteps, default to 0 (same as before) Out HiZ downsampling filter erodes depth at edges of objects, so if objects picks a low mip, there's a good chance it won't see any occluding depth Tests: ran around apartments monument in editor with 0, 2 and 7. at 2 saved only 0.25% percent of drawcalls, but 7 can save up to 10% (will profile standalone later)