Search found 45 matches

by dr_eck
Mon Mar 27, 2017 4:06 pm
Forum: General Development
Topic: Google Draco
Replies: 7
Views: 2721

Re: Google Draco

Thanks for responding; I was beginning to wonder if the board was comatose. My understanding is that that Draco is aimed at compressing 3D models. A simple application of this might be to decrease the time it takes to load a large model from storage. It may or may not be possible to use this compres...
by dr_eck
Thu Mar 23, 2017 2:09 am
Forum: General Development
Topic: Google Draco
Replies: 7
Views: 2721

Google Draco

Is anyone considering implementing Google Draco in a renderer? It's code for compressing meshes. Here's a link: https://github.com/google/draco

Steve
by dr_eck
Thu May 19, 2016 8:06 pm
Forum: General Development
Topic: How to measure "real" material for rendering
Replies: 11
Views: 5424

Re: How to measure "real" material for rendering

Angle of incidence is varied by moving the light source. The system is designed so that the beams of light coming through the aperture at various angles are all parallel in the vicinity of the beamsplitter. The picture on this page http://eckop.com/optical-scatter-2/optical-scatter/how-conoscopic-sc...
by dr_eck
Tue May 17, 2016 6:14 pm
Forum: General Development
Topic: How to measure "real" material for rendering
Replies: 11
Views: 5424

Re: How to measure "real" material for rendering

We're very close to snagging an imaging sphere, so I'm curious about how a conoscopic scatterometer deals with light sources? If we want to measure the reflectance with a number of light source angle increments. We also have non-optically smooth surfaces that we measure, things that are really roug...
by dr_eck
Mon May 09, 2016 6:49 pm
Forum: General Development
Topic: How to measure "real" material for rendering
Replies: 11
Views: 5424

Re: How to measure "real" material for rendering

spectral wrote:This hardware looks interesting but completely out of our budget ! Just impressed !


Yes, the price is very high. If I could sell 100 systems, the price could be reduced by 90%, but the market just does not seem to be there. Maybe I should do a Kickstarter to really find out.
by dr_eck
Mon May 02, 2016 8:43 pm
Forum: General Development
Topic: How to measure "real" material for rendering
Replies: 11
Views: 5424

Re: How to measure "real" material for rendering

To measure BRDF and/or BTDF, what you need is a scatterometer. There are several options available. Here's link to a page on my website that may help: http://eckop.com/optical-scatter-2/optical-scatter If you want really precise results, accurate over at least 5 orders of magnitude, the ScatterScope...
by dr_eck
Wed Feb 24, 2016 6:59 pm
Forum: General Development
Topic: Sweep of a solid angle
Replies: 2
Views: 2024

Re: Sweep of a solid angle

To find the solid angle subtended by a surface, begin by projecting it onto a sphere centered on your point. The projected area can be formed by intersecting lines from the point to each of the vertices of your quad with the sphere. The projected area can then be calculated by breaking the quad into...
by dr_eck
Thu Jan 14, 2016 6:39 pm
Forum: General Development
Topic: super fast mbvh4 traversal and triangle intersection
Replies: 3
Views: 2949

Re: super fast mbvh4 traversal and triangle intersection

Congratulations! I had been beginning to wonder if anyone on this board would be able to invent a better ray tracing algorithm, and you have done it.
by dr_eck
Wed Jul 22, 2015 3:48 pm
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 16353

Re: pbrt-v3 source code now available

I took a quick run through the comments in the BDPT integrator but couldn't determine if you have implemented Georgiev's VCM or Hachisuka's near-equivalent. I'm under the impression that these are really important contributions. Are they included? Will they be? How about Markov Chain Monte Carlo? W...
by dr_eck
Wed Jul 01, 2015 6:16 pm
Forum: General Development
Topic: pbrt-v3 source code now available
Replies: 23
Views: 16353

Re: pbrt-v3 source code now available

I took a quick run through the comments in the BDPT integrator but couldn't determine if you have implemented Georgiev's VCM or Hachisuka's near-equivalent. I'm under the impression that these are really important contributions. Are they included? Will they be? How about Markov Chain Monte Carlo? Wi...

Go to advanced search