Yeah that's pretty cool how they used mocap for everything including facial expressions. That must have taken huge amount of storage to record all those keys. You can really see the subtleties in the faces from the real actor to the skinned model. Most impressive. It's pretty cool too how Cameron had these special cameras made so he could move around the capture area and have the 3D environment overlaid in the backgrounbd during the actors live motion. All this realtime stuff certainly takes a lot of computer power. That's why it costed so much I guess.
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