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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Volume AOV not rendering

13 REPLIES 13
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Message 1 of 14
Anonymous
2580 Views, 13 Replies

Volume AOV not rendering

Hey guys, having an issue with atmosphere shader not rendering to AOV. I mentioned this issue in previous Arnold core, but it's still the same in new Arnold. I'm trying to create a volume path with atmosphere shader, it's visible in driver_c4d_display, but it's totally black and empty in EXR or Tif. Any ideas?

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13 REPLIES 13
Message 2 of 14
peter.horvath6V6K3
in reply to: Anonymous

It's still a limitation. The atmosphere shader and the volume are different implementations and the atmosphere shader does not contribute to the volume AOVs. The workaround is to use a scaled Arnold Volume in box mode instead of the atmosphere shader.

Message 3 of 14
Anonymous
in reply to: Anonymous

Ok this makes sense, thank you. But it's visible in c4d_diplsay, why it can't render same to aov?!

Message 4 of 14
peter.horvath6V6K3
in reply to: Anonymous

What do you mean by it's visible in c4d_display? If the AOVs are in the Picture Viewer under the Layer tab correctly then they must be written to disk properly with the native Save option, or using Arnold drivers. Don't forget to setup the AOVs for each Arnold driver.

Message 5 of 14
Anonymous
in reply to: Anonymous

Atmosphere was visible in volume aov in previous Arnold core. Now it's not. I'm trying to follow your advice, but the result looks completely different with box volume

Message 6 of 14
Anonymous
in reply to: Anonymous

Peter, do you think is there any chance to output atmosphere to aov?

Message 7 of 14
peter.horvath6V6K3
in reply to: Anonymous

Right, it was changed in Arnold 5 when the closures and light path expressions came in. Actually as I see the atmosphere is in the emission AOV but can not be (easily) separated from surface emission at the moment. We'll take a look if the workflow can be improved in a future release.

Message 8 of 14
Anonymous
in reply to: Anonymous

Yes, it's such a vital need! Looking forward for an update.

Message 9 of 14
Anonymous
in reply to: Anonymous

Yes, it's such a vital need! Looking forward for an update.

Message 10 of 14
brurpo
in reply to: Anonymous

Yes, having the Atmosphere and Surface emission in the same AOV is terrible for post-production and broke our workflow.

Please fix this!

Message 11 of 14
lamarKPDHG
in reply to: Anonymous

Bump. Is this being fixed anytime soon?

Message 12 of 14
peter.horvath6V6K3
in reply to: Anonymous

I still don't have an ETA, sorry.

Message 13 of 14
Anonymous
in reply to: Anonymous

Maybe there is a way to mange the issue using the Leght Expressions?

Message 14 of 14
peter.horvath6V6K3
in reply to: Anonymous

It's not possible to separate the atmosphere in a light path expression either currently, as far as I know.

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