Simulating Landslides for Natural Disaster Prevention -- A Dynamic Light Sources Algorithm for Radiosity Environments -- From Psychological and Real-Time Interaction Requirements to Behavioural Simulation -- Identification of Motion Models for Living Beings -- Interactive Solid Animation Using Linearized Displacement Constraints -- Modeling Objects for Interaction Tasks -- Assisted Articulation of Closed Polygonal Models -- STIGMA: a 4-dimensional Modeller for Animation.