Glass Alpha

[KhyeKading]

I'm having problems with my glass scene's alpha. I know about "Affect all Channels" in the reflection/refraction slot. Its not as simple as that.

Below you will see the RGB Render, Alpha, reflection and refraction passes. Some of the materials are giving me straight up no alpha contribution. this seems to be directly related to the reflection of these objects, since setting their IOR from 1.2 to 1.4 causes them to contribute. I've tried seeting their Affect Channels setting to all three different values, the first gives me full alpha, and the second give me no alpha. My background is black and I need to refract/reflect that. Is there a workaroudn for this?

[vlado]

Sorry for the late reply. Can you post the scene? It's a bit hard to tell what's going on from the images.

Best regards,
Vlado

[KhyeKading]

Is there a way to send it privately?

[tashko.zashev]

Is there a way to send it privately?

Hi,

You can send it directly to support@chaosgroup.com.
Please add a note with this forum thread when you prepare your mail.

[Deflaminis]

My guess... the normals are inside out on some objects. You can test with an override material VrayLightmtl with a dirt in the diffuse slot. Block objects will have inverted normals.