Alpha Channel

[Yon]

I have forgotten.  How do you get a material (like glass) to render out its alpha channel, so you can export the image and composite in photoshop?

Thanks, Yon

[Justin Montoya]

Hey Yon!

Alpha, It's in the V-Ray frame buffer window > Dropdown menu where RGB is : 

Then you can use the Save current channel button, or you could try the Save all channels option, though this will require a Photoshop plugin to edit the OpenEXR layered image.  https://www.exr-io.com/