As you can see with PF 3 there aren't problems (maybe a little blurred). In situation with tiny lines there is the moirè effect, and you have adjust the anti-aliasing according to the scene, to have the right result. Without the anti-aliasing also the albedo layer, have moirè effect and the denoiser fail (maybe because recognized the moire effect as noise, or something else, I don't know).
You disabled the PF when using Bidir because the Bidir noise pattern change when change the pixel filter width, and oidn does not recognize this noise pattern, that is very different from other Render engine.
My questions are:
- Do you trainined OIDN to learn the lux bidir noise pattern? I know that is possible, like is explained here: https://github.com/OpenImageDenoise/oidn#training
- Why don't change the antialiasing for bidir by align it to the path tracing type?(the noise pattern don't change when PF width change).
- Or, Why don't work on improve the antialiasing of lux PT and BPT? that is the only thing that I think is not good in lux. For the other things I thinks that is very good.