I might be wrong but I have a strong feeling that normal mapping isn't much different from displacement mapping. The only difference is that displacement mapping uses grey scale images where normal mapping uses rgb images. R represents X displacement, G represents Y displacement and B represents Z displacement...
yeah, that's essentially right. They're usually generated by building an actual highres object and a lowres object and baking down the surface normal information from the highres into an image, using the lowpoly's UV coordinates.
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