Glass nnd Alfa channel

[flakie 7]

I was working on a rendering with a lots of glass , but when I compose the image the backround has the Alfa Chanel but the glass is opaque. Is there something I need to turn on or adjust in the Vray material?

 

Thanks

[Andrew West 276]

Increase the maximum number of recursive rays.  V-ray settings- Raytrace- Max Trace Depth- set it to 7 or more.  This will slow your render but affect the alpha as you need.

[flakie 7]

Thanks

[Spannerhead 5]

Having this issue in RenderZone.  Both Glass, Accurate and Glass, Simple are opaque when rendered with an alpha channel BG.  Any way to make them transparent?

Thank you!