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byronfillmore

Pyro Smoke intersecting Geometry (Newbie Question)

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I am racking my brain trying to figure out how to composite my simulation that has smoke intersecting with geometry.

Basically, I have a simple simulation with some billowing smoke coming off of some fractured geometry.  How do I render the smoke to exclude the areas hidden by the geometry.  Is there some kind of Alpha Mask that needs to be generated with the smoke?

I apologize if this is a stupid question but I am just learning VFX.

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on the object you have to set "Matte shading", or in mantra you can select objects that you want to be used as matte.

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