Simulating cartoon style animation

ABSTRACT

Traditional hand animation is in many cases superior to simulated motion for conveying information about character and events. Much of this superiority comes from an animator's ability to abstract motion and play to human perceptual effects. However, experienced animators are difficult to come by and the resulting motion is typically not interactive. On the other hand, procedural models for generating motion, such as physical simulation, can create motion on the fly but are poor at stylizing movement. We start to bridge this gap with a technique that creates cartoon style deformations automatically while preserving desirable qualities of the object's appearance and motion. Our method is focused on squash-and-stretch deformations based on the velocity and collision parameters of the object, making it suitable for procedural animation systems. The user has direct control of the object's motion through a set of simple parameters that drive specific features of the motion, such as the degree of squash and stretch. We demonstrate our approach with examples from our prototype system.

REFERENCES

• 1: Alan H. Barr, Global and local deformations of solid primitives, Proceedings of the 11th annual conference on Computer graphics and interactive techniques, p.21-30, January 1984
• 2: Ronen Barzel , John F. Hughes , Daniel N. Wood, Plausible motion simulation for computer graphics animation, Proceedings of the Eurographics workshop on Computer animation and simulation '96, p.183-197, December 1996, Poitiers, France
• 3: CAMPBELL, N., DALTON, C., AND MULLER, H. 2000. 4d swathing to automatically inject character into animations. In SIGGRAPH 2000 Conference Abstracts and Applications, ACM SIGGRAPH, 174. Technical sketch.
• 4: Petros Faloutsos , Michiel van de Panne , Demetri Terzopoulos, Dynamic Free-Form Deformations for Animation Synthesis, IEEE Transactions on Visualization and Computer Graphics, v.3 n.3, p.201-214, July 1997 [doi>10.1109/2945.620488]
• 5: Amy Gooch , Bruce Gooch , Peter Shirley , Elaine Cohen, A non-photorealistic lighting model for automatic technical illustration, Proceedings of the 25th annual conference on Computer graphics and interactive techniques, p.447-452, July 1998 [doi>10.1145/280814.280950]
• 6: John Lasseter, Principles of traditional animation applied to 3D computer animation, Proceedings of the 14th annual conference on Computer graphics and interactive techniques, p.35-44, August 1987
• 7: Dimitri Metaxas , Demetri Terzopoulos, Dynamic deformation of solid primitives with constraints, Proceedings of the 19th annual conference on Computer graphics and interactive techniques, p.309-312, July 1992
• 8: Brian Mirtich, V-Clip: fast and robust polyhedral collision detection, ACM Transactions on Graphics (TOG), v.17 n.3, p.177-208, July 1998 [doi>10.1145/285857.285860]
• 9: Matthew Moore , Jane Wilhelms, Collision detection and response for computer animationr3, ACM SIGGRAPH Computer Graphics, v.22 n.4, p.289-298, Aug. 1988
• 10: OPALACH, A., AND MADDOCK, S. 1994. Disney effects using implicit surfaces. In Proceedings of the Fifth Eurographics Workshop on Animation and Simulation, Eurographics.
• 11: Carol O'Sullivan , John Dingliana, Collisions and perception, ACM Transactions on Graphics (TOG), v.20 n.3, p.151-168, July 2001 [doi>10.1145/501786.501788]
• 12: PLATINUM PICTURES MULTIMEDIA INC., 2000. Motion pack plug-in. Computer program.
• 13: Paul Rademacher, View-dependent geometry, Proceedings of the 26th annual conference on Computer graphics and interactive techniques, p.439-446, July 1999 [doi>10.1145/311535.311612]
• 14: WYVILL, B. 1997. Animation and special effects. In Introduction to Implicit Surfaces, J. Bloomenthal, Ed. Morgan Kaufmann, ch. 8, 242-269.

INDEX TERMS

Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Animation

General Terms:
Algorithms

Keywords:
deformation, physical simulation, squash-and-stretch, stylized animation, stylized rendering