this method, the interface has a virtual thickness, as it is represented by a smooth function. Physical properties, such as specific mass and kinematic viscosity, are calculated as: where ρ1, ρ2, v1 and v2 are the specific mass and kinematic viscosity of fluids 1 and 2. Equation can be applied analogously to the other properties of the fluids. See also Contour boxplot Zebra striping (computer graphics) G equation Advanced Simulation Library Volume of fluid method Image segmentation#Level-set methods Immersed boundary method Stochastic Eulerian Lagrangian method Level set (data structures) Posterization References External links See Ronald Fedkiw's academic web page for many stunning pictures and animations showing how the level-set method can be used to model real-life phenomena, like fire, water, cloth, fracturing materials, etc. Multivac is a C++ library for front tracking in 2D with level-set methods. James Sethian's web page on level-set method. Stanley Osher's homepage. Optimization algorithms and methods Computer graphics algorithms Image processing Computational fluid dynamics Articles containing video clips