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fog of war in a 3d game???

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I posted earlier about visibility shroud... it occurred to me that fog of war was a better term :p Anyhow... I have a myriad of problems trying to render fog of war for a 3d RTS game. Fogging the heightmapped terrain is easy, but fogging objects is tricky. Anyone have any suggestions, or any places I can go look for information???

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I haven''t done this thing in practice, but I''d use visibility circles around each object. In 2D it would be very simple, but in 3D I suppose you could do it using an algorithm similar to lightmapping.

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