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Using 3d space to represent movement of the textures. Currently a frame is split up into blocks, and they are moved about in 2d (X&Y). Using a 3d model of the movement would theoretically gain you some savings, as it would require less refreshing of the moving blocks.

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Quite. You can define a textures+trimeshes+motion format and have the decoder be well defined, then have encoders compete to do better, as we have seen with the 2d codecs. Clearly starting form something in GL, like a game walkthrough (How much of youtube is that?) is easier than starting with Bladerunner. A Pixar movie would be somewhere inbetween.

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