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Sky Rig -> VDB to Spheres result is inverted?

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Having an issue where VSB To Spheres is filling the "empty" regions of Houdini Sky Rig VDB's, and also some imported VDBs.  I see correct results when testing with the Disney cloud dataset ( https://www.technology.disneyanimation.com/clouds ), the VDB to Spheres works correctly, filling the cloud with spheres and approximating its shape.

Is there a setting somewhere to fix this behaviour? 

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If after the Sky Rig you put down a Convert VDB and set: Convert To "VDB" and VDB Class to "Convert Fog to SDF" and then you use the VDB to spheres, it works. 

Edited by Andrea

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