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Light Sampling Issue (Mantra)

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Quick question.

This is the diffuse AOV from a render using nothing but a distant light.

To give you an idea, this scene is rather large. The geometry in this scene is a ocean volume and a plane. I have removed the displacement map from the material to isolate this as much as possible. I can not for the life of me find what sampling quality I'm missing here. 

Does anyone recognize this kind of circle pattern coming from the light?


Edited by Feather

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SOLVED: It's not a light, its not a sample. ITS FOAM. 

When writing out the spectra and you're not using the foam, turn it off. 

Turns out those circles are gigantic, I mean impossible to recognize as such foam particles. 

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