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

[Erik Englesson]

Hi Stefan,

Thanks for letting me know!

For the interested reader, I found the following white paper The Iray Light
Transport Simulation and Rendering System <https://arxiv.org/abs/1705.01263>
with corresponding slides
<http://on-demand.gputechconf.com/gtc/2017/presentation/S7328-alexander-keller-nvidia-Iray-light-transport.pdf>.
I think the white paper was a talk at SIGGRAPH 2017 and the slides are from
GDC 2017. I will have a closer look at these later.

Thanks,
Erik


On 29 May 2018 at 09:40, Stefan Werner <stewreo at gmail.com> wrote:

> 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> 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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