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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Volume gradient banding?

7 REPLIES 7
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Message 1 of 8
Anonymous
557 Views, 7 Replies

Volume gradient banding?

How do I solve volume gradient banding such that I can get a perfectly smooth gradient of light dispersion? I have a simple spot light and an atmosphere_volume. Increasing the sample params in both do not fix the banding. I can't find any info on banding in the arnold docs.

My scene:

4718-snapshot-020.png

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7 REPLIES 7
Message 2 of 8
lee_griggs
in reply to: Anonymous

Does it happen in the IPR, Picture Viewer window and when you save it? Have you tried a different file format (EXR)?

Is there anything special in the scene? LUTs? Can you upload the scene?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 8
Anonymous
in reply to: Anonymous

The banding occurs in the IPR, picture viewer, and when it is saved. I will try EXR next.

Nothing special in the scene. No LUTs. Although in the IPR I am using its build in display tab modifiers such as saturation, contrast, gamma. With those turned off the image is still visibly banding, although not as much because the added contrast isn’t making it more apparent. But it’s definitely still there.


I will also upload the scene later when I’m back at my desktop.

Message 4 of 8
Anonymous
in reply to: Anonymous

@Lee Griggs

Here's the scene file. Just a light and an atmosphere_volume. Turn on the IPR display filter and crank up the contrast to make the banding more obvious.

I couldn't get EXR to work. Unless I was doing it wrong.

gradientbanding.zip

Message 5 of 8
lee_griggs
in reply to: Anonymous

I thought you might have dither disabled but it looks like it is enabled. I believe this is expected behavior.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 6 of 8
Anonymous
in reply to: lee_griggs

Where can dither be disabled?

Message 7 of 8
lee_griggs
in reply to: Anonymous

In the png driver options.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 8 of 8
Anonymous
in reply to: Anonymous

@Peter Horvath Any ideas to solve this problem?

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