Cartoon Style Animation

1
Cartoon Style Animation

• S. Chenney (NPAR 2002)
• Refs Lasseter (1), Nash

2
Comparison

• Human animator
• Convey information through imagery (personality,
  emotions, thoughts, )
• High cost, high quality

• Procedural animation (e.g., physically-based
  simulation)
• Less effective in conveying information
• low quality, interactivity

3
Squash and Stretch
4
Squash and Stretch (2)
5
Stretch and Squash

• Stretch anticipates the collision
• Squash exaggerates its effects, ensuring the
  viewers actually see the contact
• Information about their physical properties
  (mass, hardness, etc.)

• Use simple non-uniform affine deformation that
  preserve volume

6
Two Modes

• Free-space mode
• Motion generated under the influence of gravity
• shape driven by velocity (stretch applies in the
  direction of travel, by an amount that increases
  with higher velocity)

• Collision mode
• motion and shape driven by squash and stretch