Hello, I was browsing sidefx's vimeo page and I noticed in one of the intern's work there's this effect: http://vimeo.com/72062307 [vimeo.com] 3:05 mark. It a fireball falling diagonally. It featured multiple containers covering from trail to head in a “stair-case” position. I was wondering is this done. What's the setup looks like? Thank you!

I attached a screenshot.

i am not too familiar with houdini but from what it looks like it looks like clustering
http://www.sidefx.com/docs/houdini/pyro/clustering.html [www.sidefx.com]

Tighe has a nice tut on how to orient the containers along the trajectory path to save even more voxels.
https://vimeo.com/230277396 [vimeo.com]

-b