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How to generate a height field?

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Hi, i want to implement bump mapping in my current project, i have read something about it, but i stuck into a problem: I have read, to create a normal map, the first step is to create a heigth field from my texture... but i don´t know how!!! it is not explained... is there a plugin for photoshop which can do this? or could you explain the algorithm so a i can write a converter? thanks Gammastrahler

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