Simulating Cartoon Style Animation Stephen Chenney, Mark Pingel, Rob Iverson, Marcin Szymanski Presented by: Andrea Tartaro

Squash and Stretch Traditional animation example

Luxo, Jr. Squash and Stretch

Lasseter’s Principles of Animation +Squash and Stretch +Timing +Anticipation +Staging +Follow through and overlapping action +Straight ahead action and pose-to-pose action +Slow in and out +Arcs +Exaggeration +Secondary Action +Appeal =Personality

The System Ballistic motion simulator Collision detection mechanism Stylistic deformation

Cartoon Simulation Gravity Restitution (lost “energy”) Max Stretch Min Squash Stretch Rate Squash Rate

Cartoon Physics Algorithm Two modes: –Free-space –Collision 1)Update free space objects 2)Compute collision interpolation parameters 3)Update all objects involved in collisions

Special Cases 1.Coming to reset 2.Simultaneous collisions

Limitations Only convex polygonal models Only one moving object Collision must be between one deformable object and a fixed object

Applications Interactive Entertainment/ Games Animation interfaces for novices Aids to traditional animation Storyboarding animation?