Ray-noise in smoke

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Hello. I have light with generated shadow map. Render - ray tracing with settings attached below. What could be causing the noise looking like a ray?

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Can you post a screen shot of your light deep shadow settings?
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sidenimjay
Can you post a screen shot of your light deep shadow settings?

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Im thinking it could be a shadow bias issue, try lowering that to 0.01 and see if it reduces the flickering
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