Another weapon in Imageworks' arsenal was Ziva Dynamics' muscle- and skin-simulation plugin, Ziva VFX. The software takes a physically-based approach, which means more accurate looking skin sliding and movement straight out of the plugin. "If you build your skeleton accurately, that's the starting point," says Sue Rowe. "The system the guys have written will then make the muscles and skin move in the correct way so you don't have any intersections and it won't fold in on itself. What was interesting was, it's also flexible. So if I wanted to have the shoulder of the shark shudder, but in a really extreme way, we could push it to that if we wanted."

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