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BioRUST.com :: Tutorials Advanced Seamless Textures
John C. Hart
a new bump mapping scheme that can produce parallax, self-occlusion, and self-shadowing for arbitrary bump maps. It uses existing data formats, is a straightforward extension to the state-of-the-art parallax mapping, and can shade every pixel at 1024 x 76
a classic tutorial and reference on procedural texturing and modeling techiques.