[Soc-2018-dev] Weekly Report #02 - Many Light Sampling

[Stefan Werner]

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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