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Mastering Computer Animation: Techniques and Principles

Explore the world of computer animation through keyframe animation, simulation, and procedural techniques. Learn about traditional animation methods like flip books and cell animation, as well as modern advancements in the field.

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Mastering Computer Animation: Techniques and Principles

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  1. Animation Marco Gillies

  2. Computer Animation • “Making things move” • A key aspect of computer graphics • Non-realtime for films • Realtime for virtual worlds and games

  3. Computer Animation • 2 basic classes of computer animation: • Keyframe animation • Data driven • Hand animation or performance driven • Simulation • Procedural/algorithm driven • Particle systems, physics, artificial life

  4. Computer animation • Keyframe animation relies on data • from animators or actors • Simulation or procedural animation takes a more algorithmic approach • Animation is directly generated by an algorithm or calculation

  5. Course Outline • Traditional animation • Cell animation • Stop Motion • Computer animation • Trad vs Computer animation • Keyframe • Interpolation

  6. Traditional Animation

  7. Flip Books • The most basic form of animation is the flip book • Presents a sequence of images in quick succession • In film this becomes a sequence of frames

  8. The Time Line • Animation is a sequence of frames (images) arranged along a time-line Time Lasseter ‘87

  9. Cell Animation • Cell animation works on the same principle • Display a sequence of images at 25 frames per second

  10. Frames • Each frame is an image • Traditionally each image had to be hand drawn individually • This potentially requires vast amounts of work from a highly skilled animator

  11. Layers • Have a background images that don’t move • Put foreground images on a transparent slide in front of it • Only have to animate bits that move • Next time you watch an animation notice that the background is always more detailed than the characters • Asian animation often uses camera pans across static images

  12. Keyframing • The head animator draws the most important frames (Keyframes) • An assistant draws the in-between frames (inbetweening) Lasseter ‘87

  13. Other Techniques • Squash and stretch • Slow in slow out Lasseter ‘87

  14. Other Techniques • Squash and stretch • Change the shape of an object to emphasise its motion • In particular stretch then squash when changing direction Lasseter ‘87

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