Search found 45 matches

by papaboo
Wed Feb 12, 2014 12:05 pm
Forum: General Development
Topic: Hair intersection : approaches ?
Replies: 16
Views: 13395

Re: Hair intersection : approaches ?

There's the stochastic transparency approach to transparency.

http://www.nvidia.com/object/nvidia_res ... b_016.html

But if you're targeting real-time rendering I don't know if you want a random element in your renderer which could potentially produce artefacts in certain scenarios.
by papaboo
Sun Feb 09, 2014 7:32 am
Forum: General Development
Topic: CUDA and branch prediction
Replies: 2
Views: 3907

Re: CUDA and branch prediction

I haven't found anything similar too it no. However, branching is mostly performance intensive if some threads in a warp (halfwarp maybe) take divergent paths. So instead of focusing on and optimizing the branch, you might want to look at your overall algorithm and se if you can launch warps that ta...
by papaboo
Tue Aug 06, 2013 8:12 am
Forum: Links & Papers
Topic: Ray Tracing is the Future and ever will be
Replies: 23
Views: 24428

Re: Ray Tracing is the Future and ever will be

I was doing some quick profiling of Optix 3.0 last friday and it does indeed seem to compile into a mega kernel, since all I could find where calls to trace_1. However, I'm currently only compiling for devices of compute capability 1.0 and on such old devices it makes sense to generate a giant kerne...
by papaboo
Fri Jul 12, 2013 9:42 am
Forum: General Development
Topic: Sampling Ashikhmin-Shirley BRDF
Replies: 4
Views: 4581

Re: Sampling Ashikhmin-Shirley BRDF

Arh yes I could do that, but it would probably introduce too much noise in edge cases. I was hoping there would be some combined sampling technique, but if not I'll simply split it into two BRDFs and let my BSDF sample them along with any other BRDFs. Then I can combine them again once I introduce c...
by papaboo
Thu Jul 11, 2013 10:14 am
Forum: General Development
Topic: Sampling Ashikhmin-Shirley BRDF
Replies: 4
Views: 4581

Sampling Ashikhmin-Shirley BRDF

Hey everyone, I'm attempting to implement the Ashikhmin-Shirley BRDF described in An Anisotropic Phong BRDF Model, but I'm having a hard time with the sampling. In the Monte Carlo sampling section of the paper they describe how the specular part of the BRDF should be sampled by sampling each quadran...