Caustic reflection and refraction

As compared to Cycles within blender, the Cycles render within Rhino WIP is not able to generate Caustic reflection and refraction. I have tried the no_caustic option. But that only affects the transmission. Is there a way to enable those features.

Setting the no_caustics option to true will cause both caustics_reflective and caustics_refractive to be false. With no_caustics set to false those two will be true. These are the low-level Cycles integrator settings.

What you are seeing is that most likely multiple importance sampling isn’t on for everything. That is necessary for the caustics to work.

I have created RH-40088 to track this.

@rajeev - can you double-check? There have been many changes since, and while I haven’t specifically worked on this I did enable MIS and made changes related to the caustics that Cycles does support.

Thanks in advance,

/Nathan

the tracker is non public

't Is no longer thus.

Can the cycle’s renderer do refraction/dispersion, as in gem sparklie colors?

Unfortunately no. This can be faked by some degree by setting up a glass that has three different glass BSDFs, one for red, one for blue, one for green, each with a different IOR, but not with the existing materials. It’ll need a special material.

Here is an example of a material specifically build for dispersion effects. Not perfect, but it means I could recreate something similar for Raytraced: https://www.blendernation.com/2012/09/04/cycles-dispersion-glass-shader/

Ah, the link is 404, now. Thank you for trying to help me. I just didn’t see the response go by.

I did NOT learn about this from reading the entire Rhino release changelog! It’s a fabrication with no substantive evidence, whatsoever! : )