Realtime Bump Mapping Techniques
Realtime 3D graphics programmers often use variations of the technique in order to simulate bump mapping at a lower computational cost.
One typical way was to use a fixed geometry, which allows one to use the heightmap surface normal almost directly. Combined with a precomputed lookup table for the lighting calculations the method could be implemented with a very simple and fast loop, allowing for a full-screen effect. This method was a common visual effect when bump mapping was first introduced.
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