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Objective
Principles of Animation Keyframe Animation
- Principles of Animation
Principles of Animation
- Keyframe
CS 4204 Computer Graphics Computer Animation Computer Animation - - PowerPoint PPT Presentation
CS 4204 Computer Graphics Computer Animation Computer Animation - - PowerPoint PPT Presentation
CS 4204 Computer Graphics Computer Animation Computer Animation Yong Cao Yong Cao Virginia Tech Virginia Tech Objective Principles of Animation Principles of Animation Principles of Animation Keyframe Keyframe
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Principle of Traditional Animation – Disney
Squash and Stretch Slow In and Out Anticipation Exaggeration Follow Through and Overlapping Action Timing Staging Straight Ahead Action and Pose-to-Pose Action Arcs Secondary Action Appeal
- Squash and Stretch
Squash and Stretch
- Slow In and Out
Slow In and Out
- Anticipation
Anticipation
- Exaggeration
Exaggeration
- Follow Through and Overlapping Action
Follow Through and Overlapping Action
- Timing
Timing
- Staging
Staging
- Straight Ahead Action and Pose
Straight Ahead Action and Pose-
- to
to-
- Pose Action
Pose Action
- Arcs
Arcs
- Secondary Action
Secondary Action
- Appeal
Appeal
http://www.siggraph.org/education/materials/HyperGraph/animation/character_animation/principles/prin_trad_anim.htm
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Squash and Stretch
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Slow In and Out
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Anticipation
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Exaggeration
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Timing and Follow through
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Secondary actions
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Keyframe Animation
Define Character Poses at Specific Time Steps Define Character Poses at Specific Time Steps Called Called “ “Keyframes Keyframes” ”
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Keyframe Animation
Interpolate Variables Describing Interpolate Variables Describing Keyframes Keyframes to to Determine Poses for Character in between Determine Poses for Character in between
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In-betweening
Linear Interpolation Linear Interpolation Usually not enough continuity Usually not enough continuity
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In-betweening
Spline Spline Interpolation Interpolation Maybe good enough Maybe good enough
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In-betweening
Cubic Cubic Spline Spline Interpolation Interpolation Maybe good enough Maybe good enough May not follow physical laws !! May not follow physical laws !!
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In-betweening
Cubic Cubic Spline Spline Interpolation Interpolation Maybe good enough Maybe good enough May not follow physical laws !! May not follow physical laws !!
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Articulated Figures
Character Poses Described by Set of Rigid Character Poses Described by Set of Rigid Bodies Connected by Bodies Connected by “ “Joints Joints” ”
Base Arm Hand Scene Graph
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Articulated Figures
Well Well-
- Suited for Humanoid Characters
Suited for Humanoid Characters
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Articulated Figures
Joints Provide Handles for Moving Articulated Joints Provide Handles for Moving Articulated Figure Figure
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In-betweening
Compute Joint Angles between Compute Joint Angles between Keyframes Keyframes
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Example: Walk Cycle
Articulated Figure: Articulated Figure:
Hip Knee Foot Upper Leg Ankle Lower Leg Hip Rotate Hip Rotate + Knee Rotate Upper Leg (Hip Rotate) Foot (Ankle Rotate) Lower Leg (Knee Rotate)
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Example: Walk Cycle
Hip Joint Orientation: Hip Joint Orientation:
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Example: Walk Cycle
Knee Joint Orientation: Knee Joint Orientation:
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