SSS2 Render element contains GI

[jksim]

Just fooling around with multi channel exr output from the VRay FB, and noticed that the SSS2 pass contains the GI pass as well - a simple comp subtraction gets rid of it (isolating the SS2), but wondering if it's there for a particular reason?

cheers
Josh

[vlado]

Do you have the "Scatter GI" option ON in the sss2 material?

Best regards,
Vlado

[jksim]

Scatter GI was off in my original test, but it seems to still be doing odd things with it switched on as well.
Basically, I'm trying to break a beauty pass down into elements
(GI+VrayLighting+SSS2+Reflect+Spec) and rebuild in comp to match the beauty pass.

For Scatter GI off, this works as:
(SSS2-GI, then clip black at 0) +GI +VRayLighting +Reflect +Spec


With Scatter GI on, the beauty pass goes much darker (just using flat default colour as GI overrirde) and to match it I need to:
(SSS2-GI, NO clipping) +GI +VRayLighting +Reflect +Spec.... this makes the SSS2 material match nicely with the beauty pass, but the plane that its resting on needs to have the first operation masked out (needs an extra render pass )

Not sure if this is how it's meant to work? I'm open to suggestion...

BTW, I'm in 2010 x64 with 1.5sp3a, running through Render Pass Manager

Cheers
Josh