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Bump mapping
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<p>Bump mapping is a <a href="/facts/Texture_mapping/9gDTsuXN">texture mapping</a> technique in <a href="/facts/Computer_graphics/lapBE8wv">computer graphics</a> for simulating bumps and wrinkles on the surface of an object. This is achieved by perturbing the <a href="/facts/Surface_normal/jhtLIhcu">surface normals</a> of the object and using the perturbed normal during lighting calculations. The result is an apparently bumpy surface rather than a smooth surface, although the surface of the underlying object is not changed. Bump mapping was introduced by <a href="/facts/James_Blinn/UxlnCaWD">James Blinn</a> in 1978. </p><p><a href="/facts/Normal_mapping/7YmzxkPp">Normal mapping</a> is the most common variation of bump mapping used. </p>