I’m just re-visiting Lux, and did a couple of test renders (below). What struck me is the black areas in glass when path tracing that are not there with bldir. So, I went in search of scientific information, and cam across https://www.youtube.com/watch?v=QhJhVkbCgVU.
Can someone dumb this down for me. I understood perfectly, until he started talking.
I should add, that all renders have been done with a halt condition of 3600 samples, and lux denoising.