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Interactive Simulation of Fire

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Hello, I was looking at this paper "Interactive Simulation of Fire": http://www.cs.tamu.edu/academics/tr/tamu-cs-tr-2002-7-1 and am about to implement some of its concepts. However, I have a problem of comprehension. On page 8, the construction of the Combustion parameter "C" is explained (for the combustion process). I do understand everything except for what dA really is and what D is used for. The paper says dA is the Oxygen density (I currently have a constant defined for this value). And it says it is defined as: D = dA + dg + da and that D is constant. Hmm, ok, dg and da are the fuel and exhaust densityies. but what´s the definition of dA now? Or do I define a "D" constant, take the fuel and exhaust denisties and substract the sum from the constant to get dA? Could anybody explain that to me? I really don´t understand it, but need to. :( Thanks for any help! Best Katachi

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