alpha channel vray gpu grasshopper not working

[citro3101]

So have a simple wrapper material for a background..if i render with CPU the Alpha shows fine, but if i select gpu-..it doesnt work.

Any solution?

[richard_aubin1]

Hello,

Screen shots of relevant information would be useful, like CPU vs GPU output for visual comparison.

[citro3101]

solved.. gpu alpha only works with matte disabled for secondary and then cpu works in both scenarios.. thanks.