View Full Version : Siggraph 2014: Boosting Monte Carlo Rendering by Ray Histogram Fusion

09-04-2014, 07:51 AM
Just an FYI...


This paper proposes a new multi-scale filter accelerating Monte Carlo renderers. Each pixel in the image is characterized by the colors of the rays that reach its surface. The proposed filter uses a statistical distance to compare with each other the ray color distributions associated with different pixels, at each scale. Based on this distance, it decides whether two pixels can share their rays or not. This simple and easily reproducible algorithm provides a PSNR gain of 10 to 15 decibels, or equivalently accelerates the rendering process by using 10 to 30 times fewer samples without observable bias. The algorithm is consistent, does not assume a particular noise model, and is immediately extendable to synthetic movies. Being based on the ray color values only, it can be combined with all rendering effects.

09-04-2014, 09:51 AM
Interesting stuff, and it includes sourcecode.
non interpolated monte carlo is already pretty fast in LW (and in Modo), but this seems like a nice speedup.
Newtek should take a look at this.


09-04-2014, 10:09 AM
If this is practical beyond a sigraph paper things are about to get interesting.

09-05-2014, 12:03 AM
i guess there is no reason not to include it...


09-05-2014, 05:59 AM
Strange thing is that this doesn't look like it's using global Illumination.


09-05-2014, 06:31 AM
It is, if you go to second 15, the inner wall of the tray would be totally black if it wasn't. (unless other light sources were present, but they aren't).

09-05-2014, 06:38 AM
You're right, they aren't using any environment, that's the reason why it all seems a bit dark. Most developers aren't artists ;-)