OTOY Forums

Is there a way to have light that has been reflected from a surface to be scattered when the light and surface are in an Octane For Volume?
Thanks,
Greg

Hi Greg,

This is possible thanks to Octane's light transportation capabilities, however, it is a highly computational scenario. PMC would be the appropriate kernel and it is needless to say that the scene would require
• a volume with not a dark scattering (in Standalone, it is black by default),
• a default or high enough GI Clamping value, as the lower it is set to, the less natural secondary bounces (in short),
• ≥ 2 ray depth values
• Powerful-enough source light and/or high-enough Camera Imager exposure value.

With volume: Without: The ORBX has been attached.

Thanks Elsksa!

I have been able to create the effect using OctaneX Enterprise for C4D (PR11 for MacOS Big Sur (Metal))

The effect isn't as dramatic as I had hoped. And, as you say, compute intensive. It is hard to see the effect in the attached image but I can see it on my system. Very faint scattering from the cube to the cone.

No Volume: With Volume:

Your case is different and more difficult as it is involving "volumetric caustics". Patience will be key for such scenarios.
I would suggest having the PMC's Parallelism value to 1 and additionally lower the ray-depths values to a 2-5 range.

There will be a new Kernel that will handle caustics better, although I do not know (or remember) how volumetic caustics will be handled with it. If I am not mistaking, Brigade, from the published demos, is also capable of handling volumetric caustics in an efficient way.