Rendering with alpha channel

Hey everyone;

Quick question, I'm hoping you all can help.

I have a script im working on that uses both image sampling and attractor points to "react" a surface (in 3d) to the surrounding environment.

Now, since the effect of this whole thing really only becomes evident in an animation, i'd like for that to be my final medium of presentation.

Is there anyway to either export an entire animation from grasshopper (in a 3d format, IE FBX), or to render an animation using alpha channel masking so that it could be composited into something such as 3d max?

Has anyone ever tried something like this?

Thanks so much!

alex