Functional Animation

• An independent scalar function is specified for each ``keyframed'' parameter.
• Functional animation is a basic capability that supports all others.
• Most useful for truly scalar quantities: brightness of a light source, for example.
• Splines are useful for representing functions.
• Continuity control is a must: both its automatic maintenance and selective breaking.
• The functions can be edited both explicitly, as graphs, or implicitly, through a direct manipulation interface.