4K impostors speed test.
Frequency drops from 72 to ~20 FPS when we get nearer to a model.
Since the fragment shader writes gl_FragDepth and uses discard
the program can't use the early Z-test. So Z-sorted atoms are useless?
Due to relatively low Z-test accuracy impostors intersections are not very smooth.
How to improve Z-testing accuracy in WebXR? MiniMol WebXR viewerupdated 12 Oct 2020