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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.

Figure 1: Reconstruction of a flower model from a sketch: the input sketch (a), the guide strokes provided by the user which will be used for the 3D cone reconstruction (b), the segmented sketch into petals and other botanical elements (c), the reconstructed model from the same point of view as the input (d); and from a different view (e).

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