Abstract: We present a method for the directable animation of photorealistic liquids using the particle level set method to obtain smooth, visually pleasing complex liquid surfaces. We also provide for a degree of control common to particle-only based simulation techniques. A variety of directable liquid primitive variables, including the isosurface value, velocity, and viscosity, can be set throughout the liquid. Interaction of thin liquid sheets with immersed rigid bodies is improved with newly proposed object-liquid boundary conditions. Efficient calculation of large-scale animations is supported via a multiple grid pipelined flow method and a novel moving grid windowing technique. In addition, we propose a few significant algorithmic enhancements to the basic liquid simulation algorithm to provide for the smooth merging of liquid drops, allow for the efficient calculation of high viscosity liquids, and ensure the proper treatment of isolated free liquid pockets surrounded by controlled liquid regions.