promod

hi every one…
AS i am new to Houdini but i have my own target to reach step by step..


can any one have an idea how to do flip animation of a geometry faces…..
I need idea or procedure effect like this…..

http://www.youtube.com/watch?v=7V1LoJt7IZw [youtube.com]

or

http://www.youtube.com/watch?v=HDQRsFG6ZXY&feature=related [youtube.com]

please HELP me through this….

similar effect with hip files will be more help full… PLZZZZ….

Thanks in advance…….