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Height Maps?

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I know i sound noobish but I remember seeing some free code on generation 3d terrain from height maps. Im not sure what the technical name is but you have 2 (2d) bmps, one of them shows elevation and the other shows the actual color. Using these two data, there is some alogorithm that generates 3d points. Is there any code i can see? Any links?

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Sorry the 2nd one is opengl specific, but that shouldnt matter because its the theory that counts and it shouldnt be that hard to port it to directX.

[Edited by - Ainokea on November 23, 2004 12:04:39 AM]

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