transparency in png

[Jiri.Matys]

Hi,

have a problem in GPU. After long time used png texture with transparency. Just this bitmap put in diffuse slot of VRayMtl. CPU render without any problem. GPU has some problem with transparency and render it incorectly. Is it supported or not or am I done something wrong?

[Miro]

This is working fine on our side. Which V-Ray version are you using and can you share the scene here or to support@chaosgroup.com?
Thanks.

[Jiri.Matys]

I have some nightly, not sure which now. Scene sent to support.

[Jiri.Matys]

I found out when bitmap is attached to composite map and then to vraymtl, it works. But when is put straight to vraymtl, it not works.

[Jiri.Matys]

So, anyone? Is that a bug?

[Svetlozar Draganov]

That looks like a bug certainly but I'm a bit confused because Nuke actually did the same thing when merging the .png file with constant color.
The issue has been added to the bug-tracking system and I'll get back to you when I have some feedback from our developers.

On my side this actually happens with any RT engine, not just with the GPU.

[Jiri.Matys]

OK, thanks.

I tried it only in GPU, so dont know. But standard Vray works right.