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create mask for vdb to limit noise area in volume vop


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I have an vdb (sdf) to which I apply some noise in a volume vop. The noise is applied everywhere. I need it to be limited to some areas, so I need to create a mask. The mask can be driven by a noise.

Is it possible to create a mask for a vdb?

P.S. the vdb was a polygon geometry, would it be an option (and how) to use a mask from polygon into vdb? whichever way exists and works 

Edited by anicg
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