ANIMATION OF DEFORMABLE MODELS
   
                                  Ugur Gudukbay and Bulent Ozguc
  
                                       Bilkent University
                                Department of Computer Engineering
                                     and Information Science
                                  Bilkent, 06533 Ankara, Turkey
                                 Tel: (90) (4) 2664040 Ext. 2091
                                      Fax: (90) (4) 2664126
                             E-mail: {gudukbay, ozguc}@bilkent.bcc.edu

Abstract - Although kinematic modeling methods are adequate  for describing  the shapes  of static 
objects, they are insufficient  when it comes to  producing realistic animation.  Physically-based 
modeling remedies  this  problem  by including forces, masses, strain energies and  other physical 
quantities. In this paper, we describe a system for the animation of deformable models. The system 
uses  the  physically-based  modeling  methods  and  the  approaches from  elasticity  theory  for 
animating the models. Two  different formulations, namely  the  primal formulation and  the hybrid 
formulation, are  implemented  so  that  the  user could  select the suitable one for an animation 
depending on the rigidity of the models. Collision of  the  models with impenetrable obstacles and 
constraining model points to fixed positions in space are implemented for use in the animations.