I use only cloth with some constrains and forces to animate this jellyfishes.
Hope you like it.

http://vimeo.com/10934034 [vimeo.com]

intersting effect, can we see the file?

what shader did you use?

Thanks for comenting.
I´m sorry, I can´t post the file cause I made this is in a Studio.
The shader is a simple combination of a litle reflection with a high blured refraction (both made with trace vops). The trick with reflection-refraction, at least for me, is to use a PBR render with 1 or 0 difuse bounces, wich is quite fast and nice. The enviroment file parameter in the trace doesn´t work for the PBR so I use a sphere with a default enviroment cube material and ghosted.

nice!

Very cool! Nice job on the whole thing!

Hey, thanks a lot!