Search found 206 matches

by Dade
Fri May 02, 2014 8:17 am
Forum: General Development
Topic: GCC SIMD vector types
Replies: 3
Views: 43016

Re: GCC SIMD vector types

My question is: Will it internally use 2 2-element vectors with SSE2, or will it break it all the way down to scalar code since my hardware doesn't support the full 256bit AVX registers? You can just get the assembler source output (http://stackoverflow.com/questions/137038/how-do-you-get-assembler...
by Dade
Wed Apr 23, 2014 8:19 am
Forum: General Development
Topic: Smooth Shading with bidirectional path tracing?
Replies: 7
Views: 8482

Re: Smooth Shading with bidirectional path tracing?

I found it. It's in section 5.3. I haven't read the details, if anybody knows what's happening please explain it here too so that we can all learn. I will read it first. What a great thesis, always can learn new things from it. No wonder he won the Oscar... The problem is presented in section 3.7.5...
by Dade
Mon Apr 07, 2014 8:20 am
Forum: General Development
Topic: Measure the convergence speed
Replies: 20
Views: 14165

Re: Measure the convergence speed

Recently, I did some work on this topic and based on some of the papers listed in this thread. I'm very happy of the results. Following your post, I also implemented the algorithm as outlined in "Progressive Path Tracing with Lightweight Local Error Estimation". However, I found that using (AllSamp...
by Dade
Thu Apr 03, 2014 6:57 pm
Forum: General Development
Topic: Measure the convergence speed
Replies: 20
Views: 14165

Re: Measure the convergence speed

Recently, I did some work on this topic and based on some of the papers listed in this thread. I'm very happy of the results. You can find a description of the work here: http://www.luxrender.net/forum/viewtopi ... =8&t=10955

And a demo video here: https://www.youtube.com/watch?v=P_QmdpnKTW4
by Dade
Thu Mar 20, 2014 10:00 pm
Forum: General Development
Topic: Ray Tracing on a chip (yeah. again)
Replies: 8
Views: 8293

Re: Ray Tracing on a chip (yeah. again)

are the gigaflops for the raytracing or just the shaders? I assume it is peak performance in "useless" stuff like matrix multiplication (so it is like to be just the number of MADD instructions for second for 2). Another pretty obvious limitation is memory bandwidth (i.e. the memory bandwidth of hi...
by Dade
Wed Mar 19, 2014 11:10 pm
Forum: General Development
Topic: Ray Tracing on a chip (yeah. again)
Replies: 8
Views: 8293

Re: Ray Tracing on a chip (yeah. again)

raytracing would sure be useful for the oculus rift vr future. no lens-effect post processes that lead to artefacts or need much higher res rendering. just raytrace it perfectly. one day.. Ruthless self-promotion: http://www.youtube.com/watch?v=QiW24tahE7I More in topic, I have some doubt that a 15...
by Dade
Wed Mar 19, 2014 8:21 am
Forum: General Development
Topic: Ray Tracing on a chip (yeah. again)
Replies: 8
Views: 8293

Re: Ray Tracing on a chip (yeah. again)

http://www.anandtech.com/show/7870/imagination-announces-powervr-wizard-gpu-family-rogue-learns-ray-tracing Didn't Imagination acquired Caustic a while ago ? They may have integrated some of the Caustic solution in their GPUs (so it my be something not so new but it is hard to understand from the c...
by Dade
Fri Mar 07, 2014 10:47 am
Forum: General Development
Topic: Intel vs Nvidia
Replies: 3
Views: 3988

Re: Intel vs Nvidia

Who do you have more confidence in looking ~5 years down the road from now, Intel or Nvidia? It seems the perfect topic for a flame war :D "No one has been ever fired for having bought Microsoft" or Intel, IBM, etc. If you just compare the size of the companies, there seem to be no contest. However...
by Dade
Thu Mar 06, 2014 10:36 am
Forum: General Development
Topic: Measure the convergence speed
Replies: 20
Views: 14165

Re: Measure the convergence speed

BTW, there is no way without "reference image", by example, by measuring the pixel color after every pass ? Check "A perceptual stopping condition for global illumination computations" paper (http://www.sic.sp2mi.univ-poitiers.fr/publications/files/publi2753.pdf) for a study of the problem of evalu...
by Dade
Wed Mar 05, 2014 10:50 am
Forum: General Development
Topic: Measure the convergence speed
Replies: 20
Views: 14165

Re: Measure the convergence speed

LuxRender uses Hector Yee's algorithm (http://pdiff.sourceforge.net/metric.html) for rendering halt condition (the code is available at https://bitbucket.org/luxrender/luxrays/src/c2e001201b2bd7751037249f6a20fa773bf3defd/src/slg/utils/convtest/?at=default and is based on http://pdiff.sourceforge.net...