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Physically based rendering from first principles

(imadr.me)
287 points imadr | 1 comments | 02 Sep 25 18:07 UTC | HN request time: 0.215s | source
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kelseyfrog ◴[02 Sep 25 23:09 UTC] No.45110298[source]▶
Are there any data driven approaches to physically based rendering?

Can't we measure micro-facet depth and angle distribution of real world materials using laser speckle and use it to inform the normal distribution function? Deriving ideals from first principles is great and all, but verifying them against real world measurements seems like the bare minimum.

replies(2): >>45110391 #>>45110886 #
1. corysama ◴[03 Sep 25 00:30 UTC] No.45110886[source]▶
There have been decades of research into generalized BRDF measurement of real materials. Usually it starts with capturing calibrated images of the combination of all camera angles and all lighting angles on the hemisphere.

https://www.researchgate.net/figure/Picture-of-the-BRDF-meas...

https://www.iosb.fraunhofer.de/en/projects-and-products/sig_...