p424-thorne

p424-thorne - Permission to make digital or hard copies of...

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Unformatted text preview: Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or direct commercial advantage and that copies show this notice on the first page or initial screen of a display along with the full citation. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers, to redistribute to lists, or to use any component of this work in other works requires prior specific permission and/or a fee. Permissions may be requested from Publications Dept., ACM, Inc., 1515 Broadway, New York, NY 10036 USA, fax +1 (212) 869-0481, or permissions@acm.org. Motion Doodles: An Interface for Sketching Character Motion Matthew Thorne David Burke University of British Columbia * Michiel van de Panne Figure 1: (a) Motion lines as used in a drawing (b) 2D motion sketch and the resulting animation (step, leap, front-flip, shuffle, hop) (c) 3D motion sketch and resulting animation (walk, flip through window, walk, leap onto building, walk, leap off building) Abstract In this paper we present a novel system for sketching the motion of a character. The process begins by sketching a character to be animated. An animated motion is then created for the character by drawing a continuous sequence of lines, arcs, and loops. These are parsed and mapped to a parameterized set of output motions that further reflect the location and timing of the input sketch. The cur- rent system supports a repertoire of 18 different types of motions in 2D and a subset of these in 3D. The system is unique in its use of a cursive motion specification, its ability to allow for fast experimen- tation, and its ease of use for non-experts. Keywords: Animation, Sketching, Gestural Interfaces, Computer Puppetry 1 Introduction Animation has existed as an artform for approximately 80 years and the technology used to create animations has evolved tremen- dously. Unfortunately, animation tools usable by non-experts re- main in short supply. In this paper we develop a cursive motion notation that can be used to draw motions. We present an interac- tive animation system that interprets the notation as it is drawn. The system is simple enough to be usable by novice animators, includ- ing children. With an appropriate tailoring of the motion vocabu- lary, we expect that motion sketching systems may find applications in film storyboarding, theatre staging, choreography for dance and sports, and interactive games. * email: mthorne,dburke,van@cs.ubc.ca 1.1 Overview What does it mean to sketch a motion for a character? We pro- pose one possible answer to this question, inspired in part by mo- tion illustration techniques, such as the use of loops to indicate a tumbling motion as shown in Figure 1(a)....
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