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First, they do a complete tomography scan on the subject, which gets stored in the computer to get combined with "high-speed fluoroscopy" footage of the animal in motion. That generates a highly detailed 3D computer animated model that can be seen from any angle. So detailed that it can capture 1,000 frames per second with a precision of a tenth of a millimeter.
Watch a pig eating VIDEO at Gizmodo...... It's well worth it!
Image credits: D.B. Baier for the Alligator