Chapter 9 animation

CHAPTER HIGHLIGHTS
• Animation basics
• Traditional animation techniques
• 2-D animation techniques:
– Keyframe
– Tween
– Programmed
• 3-D animation:
– Motion capture
– Kinematics
– Animating with physics
• Guidelines for animation in
multimedia
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PINNACLE OF MODERN MULTIMEDIA
• Animation draws inspiration from each of the other media.
• Computer is a partner in creative expression.
– It lowered costs and increased ease of creating animation.
– It supports creative expression through:
• Interactivity
• 3-D sensory experience
• Embodiment and implementation of rules of behavior.
3

ANIMATION BASICS
• Animation: rapidly displayed sequence of individual, still
images.
• Made possible by "persistence of vision."
– Images formed on the retina persist for a short period of time after
stimulus has disappeared.
– This physical memory of the retina produces the illusion of motion.
4

ANIMATION BASICS
• Flipbook technique
– Still images showing a different stage of motion are created on each
page.
– Pages are "flipped" in rapid succession to view the motion.
– Animation basics used in flipbook:
• Quality of motion is based on rate of display.
• Speed is based on differences between images.
• Onionskinning: a technique used to draw new image based on the
previous image.
• Registration: physically aligns images with one another.
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TRADITIONAL ANIMATION
• Film based process
– Images are photographed and recorded as separate frames on long
strip of transparent film.
– Film passed in front of light source and animation appeared on a
screen.
• Film enhanced possibilities of animation.
– Multiple reels allowed longer animations.
– Projectors displayed images at reliable frame rates.
– Animators could add sound to the motion.
6

CHALLENGES OF TRADITIONAL ANIMATION
• Number of images to create.
– 24 frames per second requires 1,440 individual still images for each
minute of animation.
– Methods to generate images include:
• Shooting on twos cuts number of images in half.
• Cycle of images can be reused to extend repetitive motion.
• Holds produce sequence of identical drawings to extend a particular state
or action.
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CHALLENGES OF TRADITIONAL ANIMATION
• Artistic strategies to create realistic world require:
– Awareness of how things move in the world.
• Ease-in and ease-out address the physics of motion.
• Overshooting a resting point addresses kinetic energy of motion.
• Different components of objects move independently of one another
(overlapping motion).
– Exaggerate motion for dramatic effect using:
• Variations in speed
• Stretch and squash.
8

Traditional Techniques
• Strategies for achieving motion have been applied to:
– Paper cut-outs
– Clay figurines
– Puppets
– Natural objects photographed, reposed and re-photographed.
9

CEL ANIMATION
• Perfected and made popular by Disney studios.
– Cel: drawings of individual frames made on sheets of celluloid.
– Drawings were then photographed to produce the animated film.
• Technique that directly influenced development of digital
animation.
10

CEL ANIMATION ADVANTAGES
• Artists saved drawing time.
– Fixed components of a scene were drawn once and layered on the
bottom of a stack of celluloid sheets.
– Moving components were drawn separately and placed on top of the
fixed scene components.
• Gave precise control over elements.
– Individual cel layers could reproduce interdependent, complex
motions.
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CEL ANIMATION ADVANTAGES
• Encouraged division of labor and promoted high artistic standards.
– Master artists drew key frames or extremes.
– Assistants drew the tweens.
– Inkers transferred drawings from paper to celluloid.
– Opaquers applied colors to the celluloid.
– Additional specialists included:
• Producers
• Directors
• Script writers
• Audio specialists
• Camera operators
• Checkers.
12

PRODUCING CEL ANIMATION
• Cost and complexity of creating animation required a
carefully defined process.
– Storyboard: sequence of drawings that sketch out content of major
scenes in the production.
– Pencil test: series of simple sketches that are photographed and
projected to test the design of the animated sequences.
– Scratch track: draft of animation’s audio track.
– Leica reel: working draft of the complete animation.
13

PRODUCING CEL ANIMATION
• Uses specialized equipment in production process.
– Specialized paints to convey proper hue.
– Specialized camera and lighting to capture cels.
– Devices to:
• Track changes in paths of animated characters.
• Align and hold the cels for camera shots.
• Synchronize and edit the final film.
• Cel animation is complex, demanding, and expensive animation.
– Computers dramatically improved the process.
14

DIGITAL ANIMATION
15
2-D & 3-D Animation

2-D ANIMATION
• Produced by mimicking basic traditional techniques such as:
• Flipbook technique
• Cutout animation technique
• Rotoscoping
• Cel animation
• Paint/draw programs are used to create the components.
• Animation software can sequence, set timing, transitions, and
produce the final animation.
16

DIGITAL CEL ANIMATION
• Animations are a series of individual frames.
– Synchronized to one or more sound tracks.
– Graphics arranged on layers.
– Major changes identified in keyframes.
– Illusion of motion produced as series of tweens.
17

ANIMATION SOFTWARE
• Elements of Flash organization.
– Timeline: horizontal row of frames.
– Frames: have multiple layers in columns.
• Layers have stacking order (background elements on lower layers,
changing elements on upper layers)
– Keyframes: define major changes in a frame.
– Tweens: frames created automatically by software.
– Onionskinning: assists in drawing changes from one frame to the next.
18

ANIMATION SOFTWARE
• Frame-by-frame animation: each frame is manually drawn to
reflect motion sequence.
– Gives detailed control of each motion.
– Time consuming process.
• Tween animation: computer generates in-between frames
based on two designated key frames.
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• Motion tween
• Path-based tween
• Shape tween (morphing)
• Size tween
• Color tween
• Transparency tween

ANIMATION SOFTWARE
• Provide tools to support animation process.
– Image-editing tools
– Alignment tools and grids to control placement
– Text tools
– Basic sound control
– Strategies to support interactivity.
20

FLASH DEVELOPMENT SCREEN
21
Development
Tools
Timeline
Layers contain
individual elements
arranged in a
stacking order of
background on the
bottom to sound on
the top layer.
Keyframes and
tweened sequence.
Frame one on
the timeline

PROGRAMMED ANIMATION
• Animators write commands and the computer generates the
animation.
– Requires knowledge of programming and mathematical techniques to
specify motion.
• Advantages:
– File sizes are smaller.
– Animations load and play faster.
– Reduces bandwidth and processor demands.
– Efficient creation of different versions of animated sequence.
22

PROGRAMMED ANIMATION
• Supports complex forms of interactivity.
– Computer games take input from the user and animate the objects
"on the fly."
• Scripting languages frequently used to generate programmed
animations:
– Lingo
– Actionscript
– Javascript
23

3-D ANIMATION
• Elements of 3-D animation set in
motion include:
– Objects
– Sounds
– Cameras
– Lights.
• Techniques are similar to 2-D
animation:
– Key frame
– Tween motion.
• Complex motion may involve
using models of humans and
animals.
24

MOTION CAPTURE
• Also called performance animation.
– Technique of recording motion of actual objects and mapping these
motions to a computer-generated animated character.
– Performers have sensors to track the motion of various body parts as
they create the action sequences.
• Used to capture complex natural motions that are difficult
to create.
25

FORWARD KINEMATICS
• Kinematics is study of motion of bodies or systems of bodies.
– The motion of one part generates related motion in others.
• Animator must adjust all motion in all related parts of the
body.
– Simple to implement.
– Models easily defined.
– Computer processing is minimal.
– Quality of motion depends on animator's skill.
– Animation is time consuming process.
26

INVERSE KINEMATICS
• Motion of one body part produces related motions in other
body parts.
– Simplifies animator's work and ensures consistent, realistic motion.
• Software embodies the knowledge of anatomical motion.
– Requires innovative programming.
– Demands more processing power than forward kinematics.
• Significantly reduces work of animator.
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ANIMATING WITH PHYSICS
• Software can automatically generate motions based on
properties of object and laws of physics.
• Will free animators from more tedious tasks of 3-D animation
and produce more realistic content.
– Animators can concentrate on developing stories and characters.
28

COMPLETING THE ANIMATION
• Rendering creates the final animation frames by applying:
– The modeling
– Surface definition
– Scene composition as specified by animator
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RENDERING OPTIONS
• Pre-render
– Requires enormous processing
resources and time for animated movies.
– Computer carries out complex calculations to implement the object
properties, lighting, camera angles and motions.
• Render in real time
– Computer produces animation immediately.
– Used in video games and highly interactive 3-D animations.
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Shrek 1 in 2001 used about 5
million CPU render hours.
Shrek 2 in 2004 used 10 million
CPU hours
CPU hours.
Shrek 1 in 2001 used about 5
million CPU render hours.
CPU hours
CPU hours.

ANIMATION TIPS & GUIDELINES
• Prepare for a learning curve.
– Animation programs are more difficult to master.
• Design for delivery.
– Minimize file size if delivery is for Web.
• Consider clip animation to reduce costs.
• Consult the tradition in developing motion.
– Cycles, holds, shooting on twos, tweening, stretch and squash, ease in
& ease out, overshoot & overlap motion are traditional techniques.
31

Chapter 9 animation

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Chapter 9 animation

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