Better with bubbles: enhancing the visual realism of simulated fluid

We present a method for including the visual effect of bubbles in a computer graphics uid simulation, thus en-hancing the illusion of realism for a splashing uid. Previous uid simulation methods have not included bubbles. Bubble creation is integrated into the particle level-set uid simulation algorithm. Individual bubbles are approx-imated by spheres, which form more complex shapes where they intersect. The rendering of bubbles and uid are integrated to create the appearance of one continuous surface. At the uid-air boundary, we integrate bubbles whenever level-set marker particles pass from from the outside to the inside of the uid. Thus, these particles rep-resent air that has become trapped within the uid surface. In addition, we detect empty pockets within the uid, that are often formed due to turbulence, and create bubbles within this space. This is an inexpensive way of giving the impression that the air trapped in air pockets has become bubbles. Photo-realistic images of simulation results are rendered with a raytracer that has been enhanced to include caustics, and to handle bubble-bubble interfaces. Comparison of these images with images rendered without bubbles supports our position that the simple addition of bubbles to a uid simulation greatly enhances visual realism