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How to get Volume self-shadows in Arnold?


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I have attached files.

I just can't get any self-shadows on volume. I've rendered the shadow matte testing on a polygonal geometry and it works like a charm, but for the volume (in this case a cloud) I can't get anything at all, using both:

- just shadow matte AOV

- duplicated volume with shadow matte material


Everything works fine for polygons, nothing whatsoever works for volumes when it comes to shadow matte / pass.

Am I doing something wrong? I need the self shadows of the volume.

The volume (cloud) is from Disney: https://www.disneyanimation.com/data-sets/?drawer=/resources/clouds/

And here are the houdini hip files










Edited by anicg
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