this is kind of how I thought it would work.  I take a poser figure of like a bird.  green screen the background and render a flight scene like a walk in place walk path.  aka the bird just flapping its wings.  I render the scene frame by frame and then import the frames into Photoshop where I can quickly remove the background and save the file as a ping file.  This will give me the model frame by frame in movement with a transparent background.  I import all the frames into flash and tween the frames to make a seamless sprite of the bird in flight.  I can then create a motion path in flash and have the bird fly across the screen.  This should work with any model or animation.  I was just hoping for a quicker method as this would take all day.