It's easy to import 3D charcters and people with realistic motions into a 3D program that specializes in environments, lighting and rendering, like Carrara. It can import not only the character but also the textures, motion, lighting, physics etc. Here are some tests I did.
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No portion os this website may be reproduced without express permission of Markus Rothkranz. Carrara, and Carrara Pro is a 3D cgi animation product of Eovia corp.