Utility of Key Parameters

A good keyframe animation computer system limits the number of key parameters and maximizes the utility of each.

• Parameters should have immediate geometric or visible significance. Entries in a transformation matrix are not good parameters.
• Properties of objects that are static should be maintained automatically.
• Relationships between parts of articulated objects should be maintained automatically.
• Interpolation routines should be optimized to particular parameter types. Motion paths, orientation, camera attitude, and surface properties all require different types of control.
• A real-time interface should be provided to interactively set parameters and iteratively improve the animation.