Here is a fly-through of the standard tornado simulation with some pretty filaments:
Tornado Particle System Fly-Thru
Uploaded by balint256
Hi, this is the most gracious thing I´ve seen. Did you get this out of an autodesk software? What math functions did you used here. I would like to know a little more about this. I found it while youtube-ing about sss (sub surface scatter in 3d).
Hi Pierre, thanks for your comment! This is all custom (part of a game engine I wrote: http://spench.net/drupal/software/tehengine)
I used Verlet intergration for the particle dynamics - plenty of resources out there on the Internet. There should be a link to one here: http://spench.net/drupal/software/verlet