Résumé: Space deformation is an important tool in computer animation and shape design. In this paper we present a new local deformation model based on generalized metaballs. The user speci"es a series of constraints, which can consist of points, lines, surfaces and volumes, their e!ective radii and maximum displacements, and the deformation model creates a generalized metaball for each constraint. Each generalized metaball is associated with a potential function centered on the constraint. The value of the potential function drops from 1 on the constraint to 0 on the boundary de"ned by the e!ective radius. This deformation model operates on the local space and is independent of the underlying representation of the object to be deformed. The deformation can be "nely controlled by adjusting the parameters of the generalized metaballs. We also present some extensions and the extended deformation model to include scale and rotation constraints. Experiments show that this deformation model is e

Langue: Anglais