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Ariff Jeff avatar image
Ariff Jeff asked · Oct 07 at 02:29 AM

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:

lightvolumetrics
snapshot-020.png (60.2 KiB)
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Lee Griggs avatar image
Lee Griggs answered · Oct 08 at 09:49 AM

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

Ariff Jeff

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xebajac@zdfpost.net xebajac@zdfpost.net avatar image xebajac@zdfpost.net xebajac@zdfpost.net · Oct 08 at 10:18 AM

Where can dither be disabled?

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Ariff Jeff avatar image
Ariff Jeff answered · Oct 09 at 01:08 AM

@Peter Horvath Any ideas to solve this problem?

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Ariff Jeff avatar image
Ariff Jeff answered · Oct 08 at 12:44 AM

@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


gradientbanding.zip (69.4 KiB)

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Ariff Jeff avatar image
Ariff Jeff answered · Oct 07 at 12:56 PM

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.

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Lee Griggs avatar image
Lee Griggs answered · Oct 07 at 07:02 AM

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?

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11 People are following this question.

Ariff Jeff avatar image Satish Goda avatar image Will Vinson avatar image kennybadex kennybadex avatar image Rafael Garcia Zas avatar image Neil Stringer avatar image Paul Van Emmerik avatar image Bhuwan Sharma avatar image Peter Horvath avatar image xebajac@zdfpost.net xebajac@zdfpost.net avatar image Lee Griggs avatar image
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