Z-Depth and Transparency- Glass Material

[pixela]

Hello to the VrayForum,
I am trying to render a z-depth channel but I cannot get the transparency of the glass material.
There is a house which has large glass facades on 4 sides and behind this windows there are lots of geometry: furniture and trees in the background.
When I render the z-depth channel, the glass surface nearest to the camera is rendered and everything behind this surface is ignored like glass is not transparent.
How must I render the z-depth channel so that my glass material is transparent in z-depth too?

Thanks in advance.

[rivoli]

there's an affect channels rolldown menu in the vray's mat refraction properties, you specify there where the transparency of the material has effect. set it to colour + alpha and you'll get transparent glass in the alpha channel as well.

[pixela]

I already tried this but the result didn't change.

But thank you very much for reply.

[rivoli]

I'm sorry, I don't know why but I kept reading alpha channel instead of Z. my bad. set it to the third option, which is all channels, then it should work all right.

[pixela]

Ok
I will try this. Thanks again.