Is it possible to hide an object in a MultiMatteElement pass

[theedge]

Hello !
When I render a scene with a multimatte pass it usually gives something like this :

There's nothing wrong there and I always been ok with that for my exterior renderings.
But now I have an interior scene to render which structure is basically like on my above example : a large part of the scene is behind a glass wall. I don't know if it's possible but I'd like that glass wall to be "ignored" so that I can have all the objects behind it appear in the pass.
I have tried setting the alpha contribution of the object to 0 and then to -1 but none did help.
Of course i'd like to avoid rendering again the whole the thing with the wall off just to obtain that pass :P

[RErender]

Not too bad to render it again without the glass since you do not need lights or GI.

[theedge]

Yes, but it still requires some extra work. Hopefully I'm not doing an animation so it is indeed still viable to do the rendering twice

[RE:FORM_STUDIOS]

I think I have the same problem.

Would it be possible to add an Exclude list to the multimatteelement so we can exclude transparent objects? or is this a difficult thing to achieve without a performance hit?

[instinct]

Since SP3 MultiMatte has refraction support. Set the Affect dropdown to "all channels" and MMREs will be correctly refracted.

Regards,
Thorsten

[RE:FORM_STUDIOS]

Oh I think I knew that already! ... thanks for reminding me