Using Soft Objects in Computer-Generated Character Animation
Traditional animators often criticise 3-D computer-generated animation for the stilted way objects move. Computer-generated objects or characters tend to lack the subtleties in motion seen in traditional animation. Characters do not have to be humanoid; objects can be given character, such as the brooms in the Sorcerer’s Apprentice sequence from Disney’s Fantasia. In other words, they are anthropomorphic. The motion of such objects is controlled to a fine degree to characterise their movement. Characters tend to bend as they move. At times, they must conform to their surroundings: a figure sitting in a chair is an example, or flowing water. In computer animation, popular modelling techniques such as polygon meshes or spline patches do not lend themselves to the manufacture of objects which can be given this type of motion.
KeywordsControl Point Computer Animation Polygon Mesh Spline Surface Destination Object
Unable to display preview. Download preview PDF.
- Barsky, B (1981) “The Beta-Spline: A Local Representation Based on Shape Parameters and Fundamental Geometric Measures,” PhD dissertation, Dept. of Computer Science, Univ. of Utah.Google Scholar
- Kochanek, D (1984) “Interpolating Splines with Local Tension, Continuity and Bias Control,” Computer Graphics (Proc. SIGGRAPH 84) 18(3):33–41.Google Scholar
- Peachey, D (1985) “Solid Texturing of Complex Surface,” Computer Graphics (Proc. SIGGRAPH 85) 19(3):279–286.Google Scholar
- Perlin, K (1985) “An Image Synthesizer,” Computer Graphics (Proc. SIGGRAPH 85) 19(3):287–296.Google Scholar
- Reeves, W (1981) “Inbetweening for Computer Animation Utilizing Moving Point Constraints,” Computer Graphics (Proc. SIGGRAPH 81) 2:263–269.Google Scholar
- Steketee, S and N. Badler (1985) “Parametric Keyframe Interpolation Incorporating Kinetic Adjustment and Phrasing Control,” Computer Graphics (Proc. ACM SIGGRAPH 85) 3:255–262.Google Scholar
- Sturman, D (1984) “Interactive Keyframe Animation of 3-D Articulated Models,” Proc. Graphics Interface, pp. 35–40.Google Scholar
- Wyvill, B, C. McPheeters and R. Garbutt (1986c) “The University of Calgary 3D Computer Animation System,” J. Soc. Motion Picture and Television Engineers 95(6):629–636.Google Scholar