VrayMtl SSS and Volumetric effects are much slower with VRayClipper

[Jiri.Matys]

Hi,

I just found out that SSS efects are much slower to compute when I use VRayClipper for boolean. When I boolean object itself to final mesh and render it that way, it is much faster, but result is the same. Is this a bug or is this normal for some reason?
Thank you.

[hermit.crab]

It is normal and it is the comparison with a pre-cut mesh that is misleading. When using VRayClipper both the original and clipping geometry (in mesh mode) or plane when in its default state are present within the calculation. The VRayClipper is checked for every cast ray and in the case of SSS/Volumetric effects, additional rays are cast further complicating the matter and leading to slower render times.

[Jiri.Matys]

Ok, thank you for explanation.