VRayMaterial - Affect specific channels in Refraction slot

[Pixelab]

No you have to choose between "RGB only" "RGB+alpha" and "All channels"

I'd like to affect Alpha + RGB + Multimatte but not the other channels... would be nice to add other choice in the drop down (if feasible of course !)

[vlado]

It's not impossible, but it's quite complicated...

Best regards,
Vlado