Directable Animation of Non-Photorealistic Fluids

Abstract

This paper presents a method to control and direct a physically-based fluid simulation with user defined strokes. Strokes are interpreted as flowlines and introduce a smooth velocity field in their vicinity that allows the fluid simulation to be easily directed by an animator. We also allow the fluid to interact with arbitrarily shaped obstacles and have variable viscosity during the simulation. The strokes can be alive for a finite duration and are registered to a timeline to give keyframing like control to the animator over the physics driven simulation.