VRayMtlWrapper and caustics

[k_18]

Hey, we are running into a problem when trying to spit out a caustics pass in conjunction with the VRayMtlWrapper: We have receive caustics checked but the caustics pass is returned black / no alpha when we check the matte surface option.
When unchecked the caustics pass is returned as expected and comps fine. Any pointers as to what we are doing wrong?
Cheers, J

[hermit.crab]

Works fine on a simple scene. Could you simplify and attach yours here? Mention your V-Ray and host platform versions as well.

[k_18]

Hi Aleksandar, thanks for getting back to us. I sent you the scene in a pm

[hermit.crab]

Thanks for the provided scene. It seems my initial test was wrong - caustics appear only on the refractive object itself (in my test the object overlapped with the matte surface). I've logged the issue (internal bug-tracker id: VMAX-12457) for developer investigation. Not sure if there is another workaround except rendering the VRayCaustics element separately (disabling the matte).

[k_18]

Thanks Alexandar, the shot is not long so we will render the caustics element separately for now.
Cheers

[k_18]

Any update on this, Aleksandar? It still seems to be broken in Vray 6 and Vray 5

[hermit.crab]

It's not fixed yet, I'm afraid. I'll try to bump its priority.