Search found 31 matches

by papaboo
Fri Feb 10, 2017 1:28 pm
Forum: Data Sets
Topic: Benchmark data sets
Replies: 3
Views: 327

Re: Benchmark data sets

You can find a lot of the standard scenes here http://graphics.cs.williams.edu/data/meshes.xml. I'm not aware of any generally accepted performance test. Performance depends on a lot of factors, BVH building times and quality, traversal speed, resolution, camera transformation, shading complexity, s...
by papaboo
Thu Feb 02, 2017 10:48 am
Forum: Tools, Demos & Sources
Topic: Implementation for Blue-noise Dithered Sampling
Replies: 21
Views: 1719

Re: Implementation for Blue-noise Dithered Sampling

Wouldn't it yield some improvement if the first surface the ray intersects is nearly or completely specular? In that case the noise-buildup doesn't really start until the second intersection.
by papaboo
Tue Jan 24, 2017 8:15 am
Forum: Tools, Demos & Sources
Topic: Implementation for Blue-noise Dithered Sampling
Replies: 21
Views: 1719

Re: Implementation for Blue-noise Dithered Sampling

Thanks. I will definitely have a look at that. I'm currently using an LCG and that's fast but it doesn't take a lot of high frequency phenomena to break convergence. Do you have any rendering results?
by papaboo
Wed Jan 11, 2017 6:39 am
Forum: General Development
Topic: PBRT-v3 (the book) wrong microfacet BTDF?
Replies: 3
Views: 573

Re: PBRT-v3 (the book) wrong microfacet BTDF?

You can try posting that to the pbrt google group. Matt is generally quite active in there and happy to answer questions and confirm and fix bugs.

https://groups.google.com/forum/#!forum/pbrt
by papaboo
Wed Dec 07, 2016 7:15 am
Forum: General Development
Topic: Confused about near-specular reflection that is not energy conserving.
Replies: 4
Views: 817

Re: Confused about near-specular reflection that is not energy conserving.

Regarding 2. You should never tweak your BRDF based on the light source type. That's a slippery slope. You wouldn't expect your material properties to chance based on what environment its in. Now, your BRDF is going to return values above one in some cases, which as Friedlinguini points out, is okay...
by papaboo
Fri Jul 15, 2016 11:50 am
Forum: Visuals
Topic: Glitch Pictures anyone?
Replies: 65
Views: 65958

Re: Glitch Pictures anyone?

It is, but then he wouldn't have rendered a glitch picture. :)
by papaboo
Thu Oct 01, 2015 12:13 pm
Forum: General Development
Topic: Separate GPU compute kernels vs. a single GPU kernel
Replies: 10
Views: 6042

Re: Separate GPU compute kernels vs. a single GPU kernel

Well that does make profiling a bit tricky. ;) Volume rendering and surface rendering can still use more or less the same primitive operations as in OptiX though as far as I remember. See Wenzel Jakob's thesis for the specific. But I haven't tried out volume rendering yet though, so my memory might ...
by papaboo
Thu Oct 01, 2015 8:16 am
Forum: General Development
Topic: Separate GPU compute kernels vs. a single GPU kernel
Replies: 10
Views: 6042

Re: Separate GPU compute kernels vs. a single GPU kernel

It really depends a lot on your use case, but separating the ray generation program and the gamma correction post process pass from a traversal-and-shading kernel is almost bound to give you zero improvements. The kernels are so small that anything you could gain by having better occupancy is probab...
by papaboo
Thu Jul 23, 2015 7:33 am
Forum: General Development
Topic: Question about normal mapping in Ray tracingIt looks like al
Replies: 7
Views: 4132

Re: Question about normal mapping in Ray tracingIt looks lik

A question to all of you out there using normal maps. How do you handle rays that intersect the surface on the front side, but are on the backside of the bumped normal?
by papaboo
Thu Jul 23, 2015 5:52 am
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 13713

Re: pbrt-v3 source code now available

You could always implement them as very well documented integrators and add them to the source code, then they wouldn't even have to be ready for the release. For VCM/UPS though there is already three papers and SmallVCM. If you've read and understood PBRT, then that should be enough to get anyone s...

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