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 viewer     updated 12 Oct 2020