vray after effects background channel

[Mylenium]

No idea. VRay uses its own EXR saver, so it may be a specific issue in the way how it stores the info. Maybe it's in some "invisible" channel (untagged, unnamed). Can you provide an EXR file for testing and investigating?

Mylenium

[Mayhem1980]

Ok, heres (http://gerhardvanderhoek.nl/exterior0399.exr) an exr. I found that ignoring the alpha channel works better. Only now i've got problems with edges arround the windows.

I've saved the file via the vray framebuffer.

(the exr is rather large, it has full hd output)

[Mayhem1980]

By the way.

I'm trying to composite the elements as described on this page:

http://www.vray.info/tutorials/basiccomping/

[Mylenium]

Both issues are more or less VRay problems. It is not unmultiplying the background values and stores the blended pixels instead, which makes it impossible to clean the matte later on when using anything but a solid color for background. Likewise, it is not storing the full BG, but only the visible pixels. The rest is normal. AE by itself only handles one Alpha channel and unless you embed extra object buffers or something, getting clean Alpah edges with colored backgrouznds is always problematic. Unless VRay provides more control over how it stores each element, rendering separate BG and FG passes seems the only way to get the correct result.

Mylenium

[thev]

The V-Ray channels are typically added together, ignoring their alpha (which is just the regular image alpha, in any case). So you should simply do that - there is no need to re-render the background separately to get a correct result.

Best regards,
Vlado

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.