Search found 45 matches

by papaboo
Fri Oct 11, 2019 8:28 am
Forum: General Development
Topic: Multiplying microfacets/GGX
Replies: 0
Views: 186

Multiplying microfacets/GGX

Does anyone know if the product of two microfacet distributions (specifically GGX) is also a microfacet distribution and how to compute the alpha of the new distribution? I found some conversion from alpha to standard deviation and used that along with the product of two gaussian distributions to de...
by papaboo
Tue Sep 17, 2019 4:20 am
Forum: Lighthouse 2
Topic: Insights into random number generator
Replies: 2
Views: 144

Re: Insights into random number generator

Fantastic, then I have an idea about what to expect from it.

And thanks for opening up your renderer.
by papaboo
Sat Sep 14, 2019 11:17 am
Forum: Lighthouse 2
Topic: Insights into random number generator
Replies: 2
Views: 144

Insights into random number generator

Could you elaborate a bit on the RNG used? In preperation for denoising in my own renderer I'm looking into different random number generators to get a decent set of samples pr pixel and ideally different samples for neighbouring pixels. I see that yours uses what looks like several sets of blue noi...
by papaboo
Fri Mar 22, 2019 10:53 am
Forum: Visuals, Tools, Demos & Sources
Topic: My little path tracer
Replies: 28
Views: 13350

Re: My little path tracer

If you already have the VNDF sampling from the 2014 paper then implementing the new is trivial. It's the same set of samples with the same PDF, so you just have to copy paste the reference sample method and then you'll have faster GGX sampling :)
by papaboo
Tue Dec 12, 2017 6:18 am
Forum: Visuals, Tools, Demos & Sources
Topic: Glitch Pictures anyone?
Replies: 81
Views: 112782

Re: Glitch Pictures anyone?

SPTD_glitch.png
SPTD_glitch.png (609.76 KiB) Viewed 4498 times
Messed up a transform while cleaning up my implementation of A Spherical Cap Preserving Parameterization for Spherical Distributions. I call it the Blackhole Sun effect. :)
by papaboo
Fri Oct 20, 2017 6:18 am
Forum: Links & Papers
Topic: KuaFu Renderer - UPM
Replies: 1
Views: 3229

Re: KuaFu Renderer - UPM

Looks like a made up term that he doesn't bother to define.
by papaboo
Fri Oct 06, 2017 6:38 am
Forum: General Development
Topic: Quick Question
Replies: 12
Views: 11427

Re: Quick Question

Alright. That's basically what I want to do at some point for my own path tracer as well in interactive scenarios. I don't think I've ever read anything about it, since it should be fairly trivial, but http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.155.326&rep=rep1&type=pdf and https://gra...
by papaboo
Tue Oct 03, 2017 7:58 am
Forum: General Development
Topic: Quick Question
Replies: 12
Views: 11427

Re: Quick Question

Yea, that really doesn't explain it. Now it sounds a bit more like (path) filtering, but a bounce count in the range of thousands (at least per individual path) is generally a bit silly.
If it's filtering, then there' been a ton of work done in that field.
by papaboo
Mon Oct 02, 2017 7:28 am
Forum: General Development
Topic: Quick Question
Replies: 12
Views: 11427

Re: Quick Question

What exactly do you mean by progressive depth? Render one bounce at a time and defer the next bounces (if any) to the next render call / frame? If so then I haven't seen anything directly related to that, but there are papers that sort the rays pr bounce, so visualizing them as well is fairly trivia...
by papaboo
Wed Jul 19, 2017 1:50 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 13162

Re: MIS with IBL

Interesting. I guess I must do it slightly different then, because I just tested mine with MIS and MIS + 3 light RIS (or whatever warped self-rolled version of RIS I'm using) and there is no difference. I don't scale the PDF though when evaluating multiple light sources. I simply leave the light PDF...