[Soc-2018-dev] Weekly Report #02 - Many Light Sampling
Stefan Werner
stewreo at gmail.com
Tue May 29 09:40:01 CEST 2018
Hi Erik,
I don’t recall the exact publication, but the reverse traversal was briefly described in one of the recent iRay presentations (SIGGRAPH last year maybe?). iRay appears to implement a very similar method.
-Stefan
> On 29. May 2018, at 08:20, Erik Englesson <erikenglesson at gmail.com> wrote:
>
> Hi Stefan,
>
> Good point! The paper doesn't really discuss how the method would work with multiple importance sampling and I did not think of it. Thanks for bringing this to my attention!
>
> Best,
> Erik
>
> On 27 May 2018 at 09:09, Stefan Werner <stewreo at gmail.com <mailto:stewreo at gmail.com>> wrote:
> Hi Erik,
>
> > To the best of my knowledge, the construction and sampling of the light BVH are both using top-down algorithms. So hopefully, a bottom-up traversal algorithm should not be necessary.
>
> I believe it is necessary for multiple importance sampling. When a BRDF ray hits a light source, we need to get the probability of having selected that light source via light sampling. You can take a look at Appleseed's LightTree::evaluate_node_pdf() for reference.
>
> -Stefan
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