Computer Graphics

1
Computer Graphics

• Kyoungju Park
• kjpark_at_cau.ac.kr
• http//graphics.cau.ac.kr

2
Topics

• Transform examples
• Principles of Animation
• Motion examples

3
Four universes

• Physical universe ?? ??
• Mathematical universe ???? ??? ??
• Representation universe ??? ??? ??
• Implementation universe ??? ??? ????(????)

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Translate
Physical universe
Mathematical universe

• ? ???? ??? ??, ??? ??, ???
• ? ???? ?? ???? ?? ?? ??
• ?? ???? ? ????? ? ? ??? ???

Representation universe

• ??? ??? ?? 0, 255, ???? size 40
• ??? ??? y ?? ????, ? ??? y? ??? ??? size
• ?? ???? ??, ? ???? ? ? ??? ??

5
Scale
Physical universe
Mathematical universe

• ?

Representation universe

• ?

6
Rotate
Physical universe
Mathematical universe

• ?

Representation universe

• ?

7
Arm
Physical universe
Mathematical universe

• ?

Representation universe

• ?

8
A Human Model
What is the most sensible way to traverse the
tree?
9
Principles of Animation

• Squash and stretch
• Staging
• Timing
• Anticipation
• Follow through
• Overlapping action
• Straight-ahead vs. pose-to-pose vs. blocking
• Arcs
• Slow in, slow out
• Exaggeration
• Appeal

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Speed Control

• Simplest form is to have constant velocity along
  the path

x
t
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Ease-in Ease-out curve

• Assume that the motion slows down at the
  beginning and end of the motion curve

x
t
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Linear motion
Physical universe
Mathematical universe

• ?

Representation universe

• ?

13
Bounce motion
Physical universe
Mathematical universe

• ?

Representation universe

• ?

14
Moving on curves
Physical universe
Mathematical universe

• ?

Representation universe

• ?

15
Next week

• Vectors Forces
• Object orient programming
• ???