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As quoted in the philosophy of contemporary dance: «Understanding the directions for a Free Dance performer stems mainly from the qualities and energy of the movement rather from spatial criteria», a lot of emphasis is put currently on generating computing dance movement by dynamic and energy, which is totally different from producing movement by kinematical based gestures in sequence. We argue that it is an ideal interactive media to connect computer and choreographer.In this paper, we present a set of dynamic models according to dance verbs: "to rebound", "to jump", "to flip", "to wave", etc, served by physically based particle modeling based on Newton's law. Among them, user has a high-level motion control to modify the quality of such dynamically generated movement, for example, light/strong, free/bound, sudden/sustained, etc. These dynamic models are hence well suited to produce spontaneous motion that looks natural and plausible. To sum up, we propose a methodology, focusing on the birth, the growth and the death of cause, which include mystic anticipation, inner propagation and virtual momentum exchange. Our methodology exhibits energetic succession and connects well the dance, physics and computer. It is convincingly a well-suited direction for computer-aided choreography.

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Arash HABIB1 ACROE Association pour la Creation et la Recherche sur les Outils dExpression INPG -46 av. F6lix Viallet, ABSTRACTThis paper deals with the modeling of loose soil (sandy, muddy, etc.) When an object moves on such grounds, the object's and the soil's movement both depend the mutual physical interactions, and therefore are very dificult to achieve with kinematic or geometric models.We use a particle-based dynamic modeler and achieve a discrete model of plasticity, which accounts for the influence of the soil on objects moving on this soil, but also for the influence of the object on the movement and the shape of the soil. Thus we have simulated soil compression and piling, vehicles leaving tire traces, spinning, skidding and even sinking. This first step is the simulation of the soil-object system at a discretization scale that can be termed "intermediate". A subsequent step consists of the simulation of a finer physical soil model in order to account for smaller-scale dynamic phenomena.

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