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[SOLVED]Why Doesn't Gravity Affect Smoke Density?

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I create a sphere then click on Billowy Smoke.

I disable noise on the fluid source node so I get an even smooth volume sphere.

I dive into the DOP network and set buoyancy lift to zero and turn off all shaping.

At this point when I simulate, nothing happens, no forces are disturbing my density sphere.

But shouldn't the smoke fall to the floor? There is a gravity node present.

Do I have to somehow add mass to density to get gravity to affect it?

 

 

ap_smoke_ignores_gravity.hiplc

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Ok, it looks like under the Advanced tab for External Forces, Gravity is excluded by default. If I remove that exclusion, gravity does affect my sim.

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