Introduction Animate = “Give life to” Adding the dimension of time to graphics Animator...
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Transcript of Introduction Animate = “Give life to” Adding the dimension of time to graphics Animator...
Introduction
• Animate = “Give life to”
• Adding the dimension of time to graphics
• Animator specifies movement of objects through time and space
Two main categories
• Computer-assisted animation– 2D & 2 1/2 D– Inbetweening– Inking, virtual camera, managing
data, etc
• Computer generated animation– Low level techniques
• Precisely specifying motion
– High level techniques• Describe general motion behavior
Introduction
• Low-level techniques– Shape interpolation– Helps the animator fill in the details of the motion
given enough information– Animator has a fairly specific idea of target motion
• High-level techniques– Generate a motion given a set of rules or constraints– Object motion is controlled by a model/algorithm– Fairly sophisticated computation, such as physically-
based motion
Introduction
• Another way of looking at this: level of abstraction
• Very low-level: animator colours every pixel individually in every frame
• Very-high level: tell the computer “make a movie about a dog”
• Challenge lies in developing tools that allow animators to animate on different levels
Perception
• Eye/brain assembles images and interprets them as continuous movement
• Persistence of vision: sequence of still images shown at a fast enough rate to induce sensation of continuous imagery
• Eye retains visual imprint once stimulus is removed– “positive afterimages”
• Persistence of vision is not persistence of motion
Perception
• Persistence of vision lower bound:– Playback rate of images– Critical flicker frequency
• Persistence of motion has an upper bound:– Object moves too quickly– Motion blur
• Two important rates:– Playback/refresh rate– Sampling/update rate
The early days• Persistence of vision: discovered in the
1800s.– Zoetrope– Flipbook– Thaumatrope
The early days
• End of the 19th centure introduced moving image by using a projector.– Magic Lantern and shadow puppets– Zoopraxinoscope (zoetrope + projector)– Kinetograph
• First motion picture viewer
The early days
• Animation movie pioneers– J. Stuart Blackton (smoke effect, 1900)
• First animated cartoon in 1906• Used a chalkboard for drawing and erasing frames
– Emile Cohl (Fantasmogorie,
1908)– Winsor McCay (Little Nemo)
• Each image redrawn on rice paper and then filmed
The early days
• Major technical developments by John Bray (1910): – compositing multiple layers of drawings into a final
image (celluloid)– using grayscale– Drawing background on long sheet of paper for
panning
• Max Fleischer (Betty Boop), Walter Lantz (Woody Woodpecker)
• Fleischer patented rotoscoping in 1915
The early days
• First animated character: Felix the Cat (Otto Messmer) in early 1920s.
• Disney came around end 1920s, introducing a number of innovations– Storyboards– Pencil sketches for reviewing motion– Multiplane camera– Using sound & colour
Multiplane Camera
• Move scene layers independently of camera
• Six directions of movement for each plane
Multiplane camera
• Powerful tool:– More effective zoom
• Move foreground image to the side
– Parallax effect• Moving planes at different rates
– Adding depth cues• Blur the images on more distant planes
– Introduce motion blur by fast moving planes
The early days
• Sound was added for the first time in Steamboat Willie (1928)
• Disney promoted idea that mind of the character was the driving force of the action– Analysis of real-life motion
MGM and Warner Brothers, etc.
Other Media Animation
• Computer animation is often compared to stop motion animation– Puppet animation
• Willis O’Brian (King Kong)
• Ray Harryhausen (Might joe Yong, Jason and the Argonauts)
Other Media Animation
• Claymation
• Sand animation
Physical object is manipulated, image captured, repeat
Production of Animation
• Preliminary story• Story board• Detailed story• Key Frames• Test shot• Pencil test• Inbetweening• Inking• Coloring
Computer Animationbasically follows this
pipeline
Computer Animation as Animation
• Lasseter translated traditional principles of animation to computer animation– Lasseter is conventionally trained animator
• Worked at Disney before going to Pixar• Many celebrated animations• Knick-knack (oscar-winning)
Computer Animation Research
In Research labs
• NYIT
Still frame from Gumby animation by Hank Grebe and Dick Lundin, 1984.
Computer Animation Research
• University of Utah– Films on walking and talking
figure – Animated hand and animated
face (1972)
• University of Pennsylvania– Human figure animation (Norm
Badler)
• MIRALab, Geneva– Virtual Humans (Daniel & Nadia
Thalmann)
Pioneering animation moviesPixar• Luxo Jr. (1986)
– first computer animation to be nominated for an Academy Award
• Red's Dream (1987)
• Tin Toy (1988)– first computer animation to win
an Academy Award
• Knick Knack (1989)
Early CG in film• Future World (1976)• Star Wars (1977)• Tron (1982, MAGI)
– Supposed to look like a computer• The Last Starfighter (1984)
– Use CG in place of models• Willow (1988, ILM)
– Morphing video– First digital blue screen matte extraction
• The Abyss (1989, ILM)• Lawnmower man (1992, Xaos, Angel Studios)
• Hollywood’s view of VR
Early CG in film
• Jurassic Park (1993, ILM)• Forrest Gump (1994, Digital
Domain)– Insert CG ping pong ball
• Babe (1995, Rhythm & Hues)– Move mouths of animals & fill
in background• Toy Story (1995, Pixar &
Disney)– First full length fully CG 3D
animation
Early CG on TV• Reboot (1995, Limelight
Ltd. BLT Productions)– Similar intention of “inside
computer”– First fully 3D Sat. morning
cartoon
• Babylon 5 (1995)– Routinely used CG models
as regular features
• Simpsons (1995 PDI)
More recent movies with CG• Final fantasy (2001)
– Fully 3D simulated environment
• Lord of the Rings (2001-2003)– One of the first movies
using crowds (Massive)• Polar express (2004)
– Fully motion-capture based
• The Shrek movies (2001, 2004, 2007)
• Avatar (2009)
Resources
• Milestones of the animation industry in the 20th Century– http://www.awn.com/mag/issue4.10/4.10pages/
cohenmilestones6.php3
• Brief History of NYIT Computer Graphics Lab – http://www.cs.cmu.edu/~ph/nyit/masson/nyit.html
• Rick Parent– http://www.cse.ohio-state.edu/~parent– http://old.siggraph.org/education/materials/
HyperGraph/animation/rick_parent/Intr.html