Objects invisible to camera but visible in matte render element

[LudvikKoutny]

Hi,

I bet this has probably been asked several times, but I could not find anything specific when searching forums...

I am curious if it's possible to have a mesh that's not visible to camera, but still present in matte render element. Basically I have a scene object which must not be seen in beauty pass, but I would still like to have matte of it for compositing purposes, without need to render the scene twice. I realize this is fringe use case and quite a fake, so it's not big deal if it's not possible, but would be quite helpful if it is.

Thanks in advance

[svetlozar.draganov]

This is not possible out of the box but check if the following workaround would be a better approach than rendering the scene one more time for the mattes:
http://forums.chaosgroup.com/showthr...281#post609281

[LudvikKoutny]

This is not possible out of the box but check if the following workaround would be a better approach than rendering the scene one more time for the mattes:
http://forums.chaosgroup.com/showthr...281#post609281

Thanks! That's actually pretty smart

[svetlozar.draganov]

Yes it is, I wish being that smart to invent such workarounds