Hello,

I am trying to make a tornado and I have a problem with the behavior of my pyro sim.
I use two pointCloud and gasFieldVOP to control the motion of my smoke. The point cloud are create from a curve where the tangente give the main direction of the smoke and a scatter with proper attribute to control the orbit and what I called Sink …
The source is particles at the bottom

Now strange thing happens when the smoke comes to close to the boundary of the container and i can't figure it out. Smoke appears where there is obvioulsy no source.

Please check the anim and the hip.

thanks for your help

Vincent