Object Modeling and Animation with Smoke

This paper addresses the problem of controlling the density and dynamics of smoke so that the synthetic appearance of the smoke resembles a still or moving object. The target object is modeled as a volumetric density function. In order to match the target density with the smoke density, we propose an approach to design an imaginary force field including both long-range and short-range forces as well as a nonuniform biased diffusion equation driven by the target density. The long-range force field is induced by electric charges, and is responsible for long distance smoke transportation. The short-range force field is solved by an optimization procedure, and is responsible for local density adjustment. The synthetic force fields integrated with the diffusion equation can effectively achieve the desired results.