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Rapid display of slightly different images create the illusion of motion.
Convential approach:
Keyframed animation

Keyframes, inbetween frames

Computer Assisted:
Human key frames, computer inbetweening
Need to consider arc-length parameterization, interpolation of orientation, camera animation.
Supporting techniques:
Squish-box deformations and skeletons, motion capture, kinematics and inverse kinematics.
Other animation approaches:
Physically-based dynamics, constraint-based animation, procedural animation, behavioral animation.

CS488/688: Introduction to Interactive Computer Graphics
University of Waterloo
Computer Graphics Lab