Yingcai Xiao

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Game Development Animation

• Yingcai Xiao

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Video Game

Interactive animation user-gt interface (look)
-gt action (feel) -gt feedback (A/V, haptic)
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Animation
Animation any change that has a visual
effect. Motion Dynamics movements (geometry
change) Update Dynamics attribute change
(color, texture, ) Others camera position,
lighting, rendering techniques,
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Key-frame Animation

• Defining key-frames
• Inbetweening with interpolations
• Lerping (linear interpolation)
• parabola interpolation

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Key-frame Animation
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Neighborhoodskeletons defineinterpolatedshape
s
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Graphical languages P-curves (parametric
representation of motion)
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Animation Control

• Explicit animator provides a description of
  everything that occurs in the animation.
• Tracking live action.
• Procedural movement computed by a procedure.
• Actors (Object-oriented high-level procedural
  control)
• Kinematics positions and velocities of points.
• Dynamics physical laws that govern kinematics.
• Physically based cloth draping, plastics
  bending,
• Constraint-based constraint movements.

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Double Buffering
Why? To reduce flickering How? Draw to the
invisible back buffer Copy to the visible front
buffer. (Btblt)gtvery fast with HW assistance
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Double Buffering SRGP Pseudo Code
void Draw() SRGP_useCanvas(bbfr)
DrawObjects() SRGP_useCanvas(SCREEN_CANVAS)
SRGP_copyPixel(bbfr, rect, pnt)
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Animation in Unity3D

• Key-frame animation