Search found 46 matches

by dr_eck
Thu Oct 11, 2012 5:55 pm
Forum: Links & Papers
Topic: Vertex merging paper and SmallVCM
Replies: 33
Views: 29955

Re: Vertex merging paper and SmallVCM

It's just my opinion, but I think this is the most important advance in ray tracing in the last decade. Congratulations! And thanks for sharing.
by dr_eck
Tue Oct 02, 2012 9:54 pm
Forum: Visuals, Tools, Demos & Sources
Topic: Parallella: A Supercomputer For Everyone
Replies: 5
Views: 5790

Re: Parallella: A Supercomputer For Everyone

From an EETimes article: The 16-core version would deliver 26 GFLOPs, and the 64-core version could provide 90 GFLOPs—a significant leap over alternative boards such as Raspberry Pi. That would put the 64 core version roughly equivalent to an Ivy Bridge Core i7. Porting programs to the Intel chip is...
by dr_eck
Mon Aug 20, 2012 5:49 pm
Forum: General Development
Topic: Anybody thinks seriously about diffraction in RT/PT?
Replies: 7
Views: 7152

Re: Anybody thinks seriously about diffraction in RT/PT?

Guys, what you would say about implementing edge diffraction in path tracer? Useless crap? ;) http://mail.phys.ncku.edu.tw/optics/technical/commerical/tracepro/others/edge-diffraction-1999.pdf From this paper, it appears that at least the folks at Lambda Research have thought seriously about implem...
by dr_eck
Thu Jun 07, 2012 2:35 pm
Forum: General Development
Topic: Why I cannot get the specular reflection right with mesh?
Replies: 7
Views: 6899

Re: Why I cannot get the specular reflection right with mesh

It looks as if the problem is that you are not correctly interpolating the surface normal. Look at a triangle in the debugger and make sure that the surface normals at the three vertices are different. (With the orientation of triangles in your picture, two of the three should be identical and the o...
by dr_eck
Wed Jun 06, 2012 5:39 pm
Forum: Links & Papers
Topic: Manifold Exploration: A Markov Chain Monte Carlo technique
Replies: 5
Views: 6743

Re: Manifold Exploration: A Markov Chain Monte Carlo techniq

@igneus: Extended technical report? Are you referring to something other than the ACM ToG preprint? If so, where is it?
by dr_eck
Thu Apr 05, 2012 2:35 pm
Forum: General Development
Topic: ABg BSDF?
Replies: 13
Views: 18224

Re: ABg BSDF?

Stover's book is not cheap ($70 US), but it is available here http://www.amazon.com/Optical-Scattering-Measurement-Analysis-Monograph/dp/0819477761/ref=tmm_pap_title_0 and here http://spie.org/x648.html?product_id=834142 . I just found that it's also available as an ebook for $60 US here http://www....
by dr_eck
Tue Apr 03, 2012 6:50 pm
Forum: General Development
Topic: ABg BSDF?
Replies: 13
Views: 18224

Re: ABg BSDF?

That's the reason I ask. In microfacet BRDF models, the normal distriibution function should be normalized to retur the full reflected light when integrated and a lot of the popular distribution function do. But the masking and shadowing was introduced by Torrance & Sparrow because the distribution...
by dr_eck
Mon Apr 02, 2012 5:22 pm
Forum: General Development
Topic: ABg BSDF?
Replies: 13
Views: 18224

Re: ABg BSDF?

I'm getting more and more interested in the ABC BSDF model. What is the transition angle? Also, Is the ABC a full BSDF model or only a distribution density function that needs an additional masking/shadowing factor and a Fresnel factor? The transition angle is defined in the paper by Pfisterer link...
by dr_eck
Mon Apr 02, 2012 5:02 pm
Forum: General Development
Topic: ABg BSDF?
Replies: 13
Views: 18224

Re: ABg BSDF?

@ypoissant: Nice article! I had not seen that one before. If you want background on the ABC BSDF, look for papers by Palasantzas. An earlier one in Physical Review B is "Roughness spectrum and surface width of self-affine fractal surfaces via the K-correlation model" I can't remember if I found it o...
by dr_eck
Tue Mar 27, 2012 8:15 pm
Forum: General Development
Topic: ABg BSDF?
Replies: 13
Views: 18224

Re: ABg BSDF?

Hi, does anyone know where I could find some informations about the ABg BSDF Model? I remember a discussion back on the old ompf but since that site is down I can´t find it anymore. Thanks What kind of information are you looking for? Pfisterer's article gives the equation and some guidelines for t...