SURFACE ID output for materials behind a glass material

[gcrescoli]

Is it possible to get a correct 'SURFACE ID' (or alpha map) render output for materials behind a transparent 'Glass material' (with refractive index)?

I asked MODO froum a few month ago and it seems that i not possible
https://community.foundry.com/discus...glass-material

Maybe V-Ray is able to achieve it ?
It would be great.

Thank you for your help
Gino

[boyan]

Hi, Gino

Well, check the attached scene file and video. I hope it is workable for you.

Cheers

[gcrescoli]

Thank you Boyan for your great help.
I will take a look to your file and the video.

Kind regards
Gino

[Robert]

Its a really killer feature in Vray, but keep in mind it also cost render time.