Comments for fixored?

Comment on Multiple Importance by Joe Mwangi

Joe Mwangi — Mon, 19 Jul 2010 09:55:01 +0000

To be frank with you I was not really conversant with MIS in BDPT. After really reading it http://www.maw.dk/3d_graphics_projects/downloads/Bidirectional%20Path%20Tracing%202009.pdf together with veach thesis, I think I have a clear understanding of the importance of using MIS. I think RIS won’t be efficient in this area since it requires many pdf evaluation i.e large number of path length. To make it worthwhile to use it. I see no reason of using RIS. “What would I be resampling?” – The pdf’s of the path you could have likely generated, and reject the pdfs that give bad contribution.

Comment on Multiple Importance by Simon Brown

Simon Brown — Wed, 09 Jun 2010 11:58:13 +0000

Not tried. I’m not actually so familiar with that paper, but it seems to be related to drawing samples for BRDFs or light sources that have no well-matched distribution to use directly for IS. Since all IS in that scene is trivial (hemi-spherical emission, and Lambertian BRDF), what would I be resampling?

Comment on Multiple Importance by Joe Mwangi

Joe Mwangi — Wed, 09 Jun 2010 08:51:55 +0000

Have you tried Resampled Importance Sampling by David Cline & Justin Talbot. Coupled with MIS it reduces the image variance by margins with half the required samples/pixel.

Comment on CUDA Mersenne Twister by N00B

N00B — Mon, 15 Mar 2010 21:27:24 +0000

Hi,

What is MTGP_LARGE_MASK and MtgpTemperFloat? I don’t see it in MTGP-src-1.0.1 … Is there some way to use your code with the MTGP-src-1.0.1 library?

Thanks

Comment on A Lua Syntax Highlighter by ncr

ncr — Wed, 17 Feb 2010 23:01:42 +0000

Thanks so much! This is great!

Comment on Adventures in CUDA Path Tracing: Part 1 by Daniel

Daniel — Mon, 28 Dec 2009 16:19:57 +0000

Hi Simon,

I wonder how you get such clean results in the GI using path tracing. Do you also calculate the direct light at each hit point of the path? Otherwise most paths wouldn’t ever reach the small area light source and thus resulting in a dark pixel color. Or do you use some kind of importance sampling?
The other question I would like to know is how do you use the cuda threads? Are you using bucket-rendering or some kind of image partitioning? Or do you use other techniques to avoid the watchdog time-out? Do you sum up the sampling values in your kernel or outside using the cpu?

Thanks in advance.

Daniel

Comment on Representing Rotations In Quaternion Arithmetic by Simon Brown

Simon Brown — Mon, 14 Dec 2009 09:21:21 +0000

Thanks, also fixed!

Comment on Representing Rotations In Quaternion Arithmetic by Dan

Dan — Sat, 12 Dec 2009 18:56:35 +0000

Second equation from the top, should be: i^2 = j^2 = k^2 = -1

Comment on Representing Rotations In Quaternion Arithmetic by Simon Brown

Simon Brown — Tue, 08 Dec 2009 16:02:33 +0000

In this case, p is just another quaternion rotation.

Comment on DXT Compression Techniques by Simon Brown

Simon Brown — Tue, 08 Dec 2009 16:02:04 +0000

Thanks, fixed.