Comments on: Adventures in CUDA Path Tracing: Part 2

By: D-POWER

D-POWER — Sat, 16 Apr 2011 17:23:48 +0000

Ah! You’re right. I didn’t read the title of this post carefully, I thought it is about bidirectional path tracing. Anyway, I will be very glad if you write some notes about non symmetric scattering, Veach discussion about this subject didn’t convince me enough.

Thank you for the great posts so far, they are very illuminating .

By: Simon Brown

Simon Brown — Sat, 16 Apr 2011 10:27:23 +0000

Unless I’m mistaken, this refractive asymmetry only occurs if either:
* You mix particle-based methods and tracing methods
* You have lights or sensors within different media

This scene doesn’t have either issue, so I haven’t had to handle any asymmetry issues yet.

By: D-POWER

D-POWER — Fri, 15 Apr 2011 20:44:06 +0000

Are you handling non-symmetric scattering of light due to specular refraction ?

By: David Neubelt

David Neubelt — Mon, 25 Oct 2010 16:35:47 +0000

Actually, you can ignore my question it seems you covered it in another post.

By: David Neubelt

David Neubelt — Mon, 25 Oct 2010 16:30:27 +0000

Looks good.

I’ve used importance sampling on diffuse materials before (e.g. using cos as my pdf). I’d be quite interested in what strategies you used for the other bsdf’s.

Thanks!
-= Dave

By: Miles

Miles — Sun, 24 Oct 2010 20:01:32 +0000

Very nice! I’m interested to hear how you support multiple BSDFs efficiently in a CUDA path tracer. As far as I know even iRay only supports one (albeit very flexible) BSSRDF.