Regarding Implementation of n Image Rendering Web Service in Rails

Hello,

I have a number of legacy 3D and 2D rendering applications (essentially batch applications) written in C++ that I now want to expose as services on the Web. For example as a Facebook photo hacking widget.

Can someone please suggest a pattern I should follow as the Rails wrapper around my code. One of the issue is not having the app. block on long running pixel crunching.

Cheers, Doug