Hi
here is a tutorial on how to use the pic function in houdini,hope you like and sorry for my english!
http://www.bouchakour.de/video/houdiniTutorial_512K_Stream.mov [bouchakour.de]
and hier is the animation rendered with mantra
http://www.bouchakour.de/video/Comp_384K_Stream.mov [bouchakour.de]
cheers
Farid