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Minn - The technique we are referring to is not the mixing of 2D and 3D animation, but the projection of a 2D animation onto a 3D object. There are some good examples of this at Disneyland, in the Haunted Mansion. There are some sculpted busts in the "graveyard", which appear to come alive by the projection of a movie onto their blank faces.
Ordinarily, the texture of a 3D model is static and just stays glued to the skin of the model as it bends. But that texture can also be made of many cels of animation, so that the picture on the object is constantly changing. My texture for the anemone is actually one frame of a hi-def video I took. If I were to play the frames of that video onto the texture, it would be a pretty convincing moving anemone, with a very simple underlying object (as long as the campera angle didn't change much).
The problem is, how to allow a clownfish to interact with it, and move among the tentacles if they are just projected onto the object?
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