Transparency Alpha not correct.

[THExDUKE]

Hey all. At a 50% transparent material, I would expect a midgrey looking alpha (when Affect Channels is active). But that is not coming out for some reason here. It is either almost black or pure white. There is no between. I don´t get this. I am so sure that this was working before. What am I missing?
Im on Maya2014, vray 2.4 and MacOSX 6.8.

[svetlozar.draganov]

Worked fine in our quick tests.
Can you send us a sample scene + the result you got in your environment?

[THExDUKE]

Hey Svetlozar,

thanks for the reply. Here is a zip file with the scene and a simple comp. I hope that helps. Maybe I am completely wrong, but a 60% transparent material should not look like that in composing.



VRay_Transparency_Alpha.zip

[svetlozar.draganov]

The Diffuse Color should not be complete black - change its value to 0.001 for example and you will get expected alpha values.
I'll make a note about this into our system.

[THExDUKE]

The Diffuse Color should not be complete black - change its value to 0.001 for example and you will get expected alpha values.
I'll make a note about this into our system.

Wow, thats a huge difference. I know the rule of never to use pure black and pure white but I always thought this counts for diffuse parameters or non-transparent shaders. I never would have imagined that a .001 makes such a huge difference. Thanks for that! Highly appretiated,....again

[svetlozar.draganov]

This is actually considered as a bug - the result should not be wrong even if the diffuse is complete black.
I've reported it into our system and I'll update you when we have some news about it.

[THExDUKE]

The interesting thing is when you keep diffuse completely black and start with transparency (either amount or color) with 0 and make your way to 1 at some point it then jumps from a black alpha to a complete white alpha.

[svetlozar.draganov]

Thanks for the clarification - we'll pass this information to our developers.

[THExDUKE]

Thank YOU aswell for helping me on this

[svetlozar.draganov]

This bug has been fixed for the next official service pack.