That's not working. I've tried -1 in both of them, 1 in both of them and -1 in one and 1 in the other.
The glass only appears in the alpha channel when it's in -1, and keeps ignoring the balcony. =/

Hello everyone!
I have a problem that I tried many things and can't solve.
I'm making an image with a window and a balcony on the outside. The alpha image is showing only the window and ignoring the balcony. And with that I can't put a background image in photoshop, because it would make the balcony disappear.
Anyone with the same problem?
I'm using sketchup 2017 pro and vray 3.4, never had this problem with earlier version of vray.