Smoke simulation with user specified details

Fluid flowing with small-scale details is involved in many games or animation effects. This paper aims to add such small-scale details to fast smoke simulation. In the paper, the whole smoke motion is divided into two parts: a low-resolution motion field and a high-resolution detail motion field, both of which are handled respectively and then combined with each other. The low-resolution motion field is obtained by physical simulation, during which the velocity field is stored and calculated on a coarse grid. The high-resolution detail motion field is gained through two ways. The first is by texture synthesis from an input example texture. The second is translating a small image containing simple contours to a detailed motion field. In both ways, the generation of detail motion field needs to be done only once before the low-resolution motion simulation, while the combination is executed each frame during smoke simulation. In the paper, experiments with varieties of inputs are made on two-dimension grids. Results have shown the method introduced in this paper feasible and efficient.