In engineering and special effects for film and television, fluid modeling is frequently used to simulate natural phenomena, such as fire, explosions, smoke, water, and air. Basically, this modeling uses mesh-based methods, such as finite volumes and finite elements, or mesh-free methods based on particles, such as MPS and SPH. A common question among particle techniques is the problem of boundary between fluids, since there is no general and satisfactory solution available. The objective of this work is to propose a new technique for the visualization of the boundary between fluids using the SPH method (Smoothed-particle Hydrodynamics) and the Marching Cubes algorithm. Tests are made to investigate the computational costs involved in the generation and rendering of the boundary mesh.