LuxCoreRender Forums

try glossiness at 0.0 ... just for fun

Also cache size and photon count should be calculated to fill some criteria, maybe coverage in screen space or something, instead of guessing how much photons to cast and how big cache should be Screen coverage would be a good criteria, the problem is in having a constant radius: one pixel covers 1...

I think all materials should build cache for diffuse rays. Also cache size and photon count should be calculated to fill some criteria, maybe coverage in screen space or something, instead of guessing how much photons to cast and how big cache should be lookup size should be 15 cm hardcoded usage th...

I think for max size a 1000 or 2000 should give same result but faster precomputation

@Sharlybg try also using 10-15cm lookup and usage threshold of 1 and 90 degree normal angle. Should be much faster even.

Yes it's all great and even some bias is great. I'm personally pretty confident with the feature by now, but for new users it might be important in the future to automatize what can be automatized. Or some quickstart-guide to point people to when they ask would be also good. Another small annoyance ...

A circle with 1 cm radius has 225 times smaller area than a 15 cm one, so mayble it needs that much more photons. Both corona and vray seem to use pretty big entries by default and at least in case of corona there seem to be no difference... Maybe there is some trick to counterbalance the loss of l...

So in a real scene, things just can't be solved using more and smaller cache entries. Note that 1milion photons at 15cm give even brighter scene as 100 milion photons at 1 cm. 100 milion photons at 1cm render: pgirender.jpg 100 milion photons at 1cm debug: 100milion_1cm_photons.jpg 1 milion photons ...

So it's another example where darkening is not just related to hdri... This look more like small bias not the common obvious overall darkening :roll: I don't know, maybe... I'm still using 90degree normal and as low glossiness threshold as I can get away with to have most materials in cache. Helps ...

So it's another example where darkening is not just related to hdri...