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Item Scripting Interactive Physically-Based Motions with Relative Paths and Synchronization(Blackwell Science Ltd and the Eurographics Association, 1996) Lamouret, Alexis; Gascuel, Marie-PauleThis paper presents a novel approach for facilitating the use of physically based models by animators. The idea is to let the user guide motion at a high level of control by giving approximate desired trajectories and synchronization constraints between the objects over time, while a simulation module computes the final motion, dealing with collision detection and response, and enhancing realism.The objects, which are either isolated or components of an articulated structure, are guided through the specification of key-positions and orientations, defined by coordinates that can be fixed or relative to another object. The animation sequence is scripted by specifying a graph of synchronization constraints between objects over time. During the animation, objects automatically regulate their speed in order to meet these constraints.Item Adaptive Sampling of Implicit Surfaces for Interactive Modelling and Animation(Blackwell Science Ltd and the Eurographics Association, 1996) Desbrun, Mathieu; Tsingos, Nicolas; Gascuel, Marie-PauleThis paper presents a new adaptive sampling method for implicit surfaces that can be used in both interactive modelling and animation. The algorithm samples implicit objects composed of blending primitives and efficiently maintains this sampling over time, even when their topology changes (during fractures and fusions). It provides two complementary modes of immediate visualization: displaying"scales" lying on the surface, or a"primitive-wise" polygonization. The sampling method efficiently avoids unwanted blending between different parts of an object. Moreover, it can be used for partitioning an implicit surface into local bounding boxes that will accelerate collision detection during animation and ray-intersections during final rendering.