Alpha channel and glass...

[Parker1]

A quick question for you guys...

 

I am doing an interior scene and my camera is facing toward the glass entry system. The clear glass I am using looks great and has some very nice reflections on it. I want to render the scene and then comp in the exterior background in photoshop separately. The issue is that when I select the alpha channel in PS and delete it I am deleting the glass as well and thus I lose the reflections that were there.

 

How do you go about using clear glass and still have the ability to comp in a layer behind it in photoshop?

[Ricardo Eloy]

Save the image as PNG. Instead of selecting the alpha in PS, it comes already as a separate layer, with nice transparent glass.

[Koper]

you can also just add the vrayreflection element as an extra output to the render. and the best part is that it doesn't take longer to render.

 

also use the vraywirecolor element so that you can select the different objects/parts in you render in ps

[alias_marks]

these sound like excellent tips. I've always wondered the best way to do this as well. Up till now I've mostly usd the alpha selection from the windows like you originally did, then for the outside photo used overlayblending mode in photoshop and tweaked to get it to look right.

 

I think the previous two methods are a better way of going though.