Re: Adaptive Environment Sampling on CPU and GPU
Posted: Fri Nov 08, 2019 3:17 pm
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http://forums.luxcorerender.org/
Abstract
Multiple importance sampling (MIS) has become an indispensable tool in Monte Carlo rendering, widely accepted as a near-optimal solution for combining different sampling techniques. But an MIS combination, using the common balance or power heuristics, often results in an overly defensive estimator, leading to high variance. We show that by generalizing the MIS framework, variance can be substantially reduced. Specifically, we optimize one of the combined sampling techniques so as to decrease the overall variance of the resulting MIS estimator. We apply the approach to the computation of direct illumination due to an HDR environment map and to the computation of global illumination using a path guiding algorithm. The implementation can be as simple as subtracting a constant value from the tabulated sampling density done entirely in a preprocessing step. This produces a consistent noise reduction in all our tests with no negative influence on run time, no artifacts or bias, and no failure cases.
What a shame what a waste... and the sad news is, that the author, Jaroslav Krivanek, Corona's co-founder, died tragically today... RIP
https://www.facebook.com/CoronaRenderer ... 4382419065
Oh god... Did you find anyone (professional) actually using this mdl stuff? Why do you find it interesting? It's been around for few years afaik and I never seen anyone using this and I never find their demos anyhow impressive or interesting.Dade wrote: ↑Wed Dec 04, 2019 3:22 pm Interesting: https://news.developer.nvidia.com/shari ... -with-mdl/
just discover today what this mean. Triplanar mapping can be pretty awesomeTriplannar Mapping
VRscans mateirals can now be applied by proprietary triplannar mapping, which removes the need for explicit UV mapping.
It works that you download a vrscan material, you select a dedicated material and load the downloaded vrscan and you're ok.lacilaci wrote: ↑Thu Dec 05, 2019 6:49 am Maybe something akin to this: https://www.chaosgroup.com/vrscans would be cool and interesting. I know that large automotive design companies like to make and use scanned materials etc... I have no idea how these things work though..
Well, I find application independent physical based materials interesting.lacilaci wrote: ↑Thu Dec 05, 2019 6:49 amOh god... Did you find anyone (professional) actually using this mdl stuff? Why do you find it interesting? It's been around for few years afaik and I never seen anyone using this and I never find their demos anyhow impressive or interesting.Dade wrote: ↑Wed Dec 04, 2019 3:22 pm Interesting: https://news.developer.nvidia.com/shari ... -with-mdl/
Yes, idea is nice... But, it's been out for years unless I'm wrong.FarbigeWelt wrote: ↑Thu Dec 05, 2019 9:37 am
Well, I find application independent physical based materials interesting.