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Level set method

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Hello, I want to model a fluid using Level sets as describes in "Practical animation of fluids" by Foster and Fedkiw. I know that the level set has to be evolved according to formula 5.2 phi_t + u * nabla phi = 0 However, I have no idea how to implement the upwind differencing procedure. I tried the wikipedia-formulas on upwind differencing, but it does not seem to work for me. Solving it with the Lagrangian method works fairly well, so I am sure that the rest of my program works. Does anybody have some code or code outline how I can track my surface using upwind differencing (It should be possible using only the functions float getPhi(x,y,z) and vec3 getVelocity(x,y,z), which I already have implemented). Thanks a lot, Icebraker

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