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Shading
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<p>Shading refers to the depiction of <a href="/facts/Depth_perception/R6FK2z6o">depth perception</a> in <a href="/facts/3D_model/6V3Ry9AJ">3D models</a> (within the field of <a href="/facts/3D_computer_graphics/zlWW6eaF">3D computer graphics</a>) or <a href="/facts/Illustration/dIDdBnUo">illustrations</a> (in <a href="/facts/Visual_art/95RgxP8e">visual art</a>) by varying the level of <a href="/facts/Darkness/T8v58NK3">darkness</a>. Shading tries to approximate local behavior of <a href="/facts/Light/jeofpMn4">light</a> on the object's surface and is not to be confused with techniques of adding shadows, such as <a href="/facts/Shadow_mapping/vIy5GAEq">shadow mapping</a> or <a href="/facts/Shadow_volume/usGAIQ2d">shadow volumes</a>, which fall under global behavior of light. </p>