Generation of facial expressions

Question

How are facial expressions usually created in computer games/CG graphics? Are they made "by hand", or do people use algorithms to generate a facial expression out of a given set of parameters (e.g. something like different emotion values)?

Thanks

Answer 1

i believe they capture facial expressions of real actors and transform them to 3d models of the game characters, so i guess it falls under the 'by hand' category. i am not familiar with an algorithmic way of generating facial expression.

see Facial motion capture on wikipedia