Search found 36 matches

by papaboo
Wed Jul 19, 2017 1:50 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 2016

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...
by papaboo
Sun Jul 16, 2017 3:30 pm
Forum: General Development
Topic: MIS with IBL
Replies: 14
Views: 2016

Re: MIS with IBL

Out of curiosity, because it sounds like I'm doing something very similar and back when I was investigating it I saw no bias issues, what is the RIS trap? Is RIS conceptually flawed or is it a reoccurring 'gotcha' that you keep forgetting?
by papaboo
Tue Mar 28, 2017 5:59 pm
Forum: General Development
Topic: Google Draco
Replies: 7
Views: 2190

Re: Google Draco

Well if it's lossy then it's irrelevant. The edgebreaker compression is lossless though. It simply compresses the topology / connectivity and I seriously doubt anyone would consider lossy topology compression. High-res-CAD-model-in, swizz-cheese-model-out would be a no go.
by papaboo
Tue Mar 28, 2017 6:00 am
Forum: General Development
Topic: Google Draco
Replies: 7
Views: 2190

Re: Google Draco

The forum isn't dead, just really quiet. Like a lion on the hunt. :) Personally I can say that Draco's in my backlog and will stay there for the foreseeable future, since it doesn't really help my shoot those precious precious rays. :) I doubt that the compression would work for on GPU memory, but i...
by papaboo
Mon Mar 27, 2017 11:55 am
Forum: General Development
Topic: Google Draco
Replies: 7
Views: 2190

Re: Google Draco

What do you mean by 'in a renderer'? As datamodel pre-/postprocessing? Or actually uploading the compressed data and decompress on the fly? (if such a thing is possible)
by papaboo
Fri Feb 10, 2017 1:28 pm
Forum: Data Sets
Topic: Benchmark data sets
Replies: 3
Views: 1580

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: 26
Views: 5568

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: 26
Views: 5568

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: 1388

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: 1614

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...

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