There was a video called 'Rebirth' - the story of a giant tree that was struck by lightning. A large branch fell to the ground, and grew eyes, limbs, etc, and the video was just him walking through the forest - he eventually befriends a small bird, until finally tripping over some vines and falling into a pool of water, where he suddenly grows into a giant tree himself.
Awesome music, great visuals, but it's all just a movie - very little (if anything, as I recall) was rendered in real time. It was just a showcase of what the designers could do in terms of fmv. And hell, the SNES could pull off FMV. Rather than show the graphical prowess of the GC, they decided to just make a little movie that any of the newer systems could potentially play.
Cool movie though, I'd love to find it again.