Primary Sample Space Path Guiding

[jbikker]

Jerry Jinfeng Guo et al.'s paper on Primary Sample Space Path Guiding is now available from:
https://graphics.tudelft.nl/Publication ... 018/GBBE18

[graphicsMan]

Nice, thanks for sharing!

[ingenious]

I was initially excited by the title of the paper but I soon found a deal-breaker. With primary-/path-space path guiding, the dimensionality of the ideal cache is infinite. But the radiance field in the scene in world space is only a 4D or max 5D function (surface/volume + direction). Prior path guiding methods utilize a world-space 4D/5D cache and work really well. With path-space guiding, the curse of dimensionality kills everything.

[friedlinguini]

It seemed to have a lot of the same ideas as multidimensional adaptive sampling (https://www.ci.i.u-tokyo.ac.jp/~hachisuka/mdas.pdf), and also the same weaknesses.