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Computer Animation / Illustration III. Animation Techniques. Keyframe Interpolation. Types Linear Cardinal B-spline Bezier Continuity Ease-in (Slow-in) Ease-out (Slow-out) Parametric editing. Kinematics. Hierarchical objects Bones & joints Null nodes Effectors & roots

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keyframe interpolation
Keyframe Interpolation
  • Types
    • Linear
    • Cardinal
    • B-spline
    • Bezier
  • Continuity
  • Ease-in (Slow-in)
  • Ease-out (Slow-out)
  • Parametric editing
kinematics
Kinematics
  • Hierarchical objects
    • Bones & joints
    • Null nodes
    • Effectors & roots
    • Degrees of freedom
  • Forward kinematics
  • Inverse kinematics
  • Constraints
  • Limits
motion capture
Motion Capture
  • Methods
    • Rotoscoping
    • Real-time digital capture
  • Human & virtual actors
facial animation
Facial Animation
  • Early work done by Parke
  • Improved by Hill, Wyvill, Waters, etc.
facial animation6
Facial Animation
  • FACS
    • Facial Animation Control System
  • Lip-syncing
particle systems
Particle Systems
  • Source
  • Emission rate
  • Speed
  • Lifetime
  • Spread
  • Trail (or tail)
flocking
Flocking
  • Boids (Craig Reynolds)
    • Separation
      • steer to avoid crowding local flockmates
flocking10
Flocking
  • Boids (Craig Reynolds)
    • Alignment
      • steer towards the average heading of local flockmates
flocking11
Flocking
  • Boids (Craig Reynolds)
    • Cohesion
      • steer to move toward the average position of local flockmates
physics based animation motion dynamics
Physics-Based Animation(Motion Dynamics)
  • Mass
  • Density
  • Elasticity
  • Friction
    • Static
    • Kinetic
  • Forces
    • Gravity
    • Wind, water, etc.
collisions
Collisions
  • Detection
  • Avoidance
  • Response
goal directed animation
Goal-Directed Animation
  • First, goals (targets) are set for various object attributes
  • Then, the animation is allowed proceed as needed towards these goals
rule based animation
Rule-Based Animation
  • Uses rules to govern object behavior
  • Used for flocking, physics-based, goal-directed, tec.
  • Type of expressions
    • Mathematical
    • Logical
scripts
Scripts
  • Uses a scripting language to specify animation
  • Scripts can also includes previous techniques
procedural animation
Procedural Animation
  • Stochastic modeling
  • Specific behaviors are described by procedures (programming units)
  • Often used for secondary actions