Multimatte behind Glas

[digitarch]

I would like to get a mask for people standing behind windows. Multimatte or vrayobjectselect doesn´t show up behind my glass shader. I tried sveral combinations of affect channels, dind´t work out.

There are several threads concerning the "multimatte behind glas" problem, but I still don´t get it. Most of them show solutions like "additional renderpass without glass objects". Psd-manager also doesn´t work behind glas.

Is there a way to get the multimatte in one single pass?
Matthias

[rivoli]

it does work here, unless you have totally reflective surfaces as windows. in that case the mask will be totally opaque as you wouldn't see anything behind it anyway.

[joconnell]

Working fine here too with objects behind a glass surface that has affect all channels.

[digitarch]

hmmmm, that´s strange. Vray and max object properties für glass objects=default, vray glass shader with reflection -refraction affecting all channels (refraction is 240, reflection 70, not fresnel) affect shadows ticked.
still no multimatte behind glas
something is missing here...something like matte object settings?

[digitarch]

haha, working with opacity instead of refraction! But is that correct?
Matthias

[rivoli]

tried with your exact same settings for the glass mat and it works as expected, that's weird..

[etown]

Make sure you don't have clamp output enabled in color mapping. I think this was messing with my multimatte behind glass.