Defrobulated angles for character joint representation

Details Defrobulated angles for character joint representation Defrobulated angles for character joint representation

2007-08-21

2007-08-21

Chauhan, Ulka J. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Animation

C345S474000, C345S475000

Reexamination Certificate

active

10844049

ABSTRACT:
The present invention includes a method and apparatus for representing joint rotations of character models that eliminates the artifacts imposed by the ambiguities inherent in four angle rotations. An embodiment of the invention transforms joint angles from their original four angle representations into a set of defrobulated angles that provides the least confusion between position and twist information. Manipulating the character model using the set of defrobulated angles eliminates the angular discontinuities responsible visual “popping” and other visual discontinuities. In an embodiment, an animator specifies a pose using joint angles in their four angle Euler form. The joint angles of the pose is transformed to the defrobulated form. The defrobulated joint angles are weighted and applied to the points of the character model. The weighted sum of the defrobulated angles for each point are then converted back to an Euler angle form to pose the point.

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