I'm playing around with a tornado effect. Trying to dig into POPS

I've created gemometry in the shape of a tornado's funnel.
I've used a transform sop to rotate the funnel in Y using $F*5.
This is my starting point for testing.

The plan is to birth particles from the surface of the funnel, get the particle effect looking right, then hide the funnel geometry from the render process.

So, I've created a source pop and am using the tornado object as source.
Particles birth yet remain still. They do not follow the rotation of my source SOP. I have a feeling that there are additional attributes that I'll need to bring into play here, but I'm at a loss. Any suggestions? Better solutions to the overall effect?

Just found this thread. Looking into it now.

http://www.sidefx.com/forum/viewtopic.php?t=1438 [sidefx.com]

Yup, thats the one you want. If you can't find the demo file Vortex.hip let us know, maybe i could mail it to you if SESI doesn't mind

cheers

I've got the file, thanks.

I'll follow this up in the other thread.