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Projective texture mapping
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<p>Projective texture mapping is a method of <a href="/facts/Texture_mapping/9gDTsuXN">texture mapping</a> that allows a textured image to be projected onto a scene as if by a <a href="/facts/Slide_projector/b2N84a91">slide projector</a>. Projective texture mapping is useful in a variety of lighting techniques and it is the starting point for <a href="/facts/Shadow_mapping/vIy5GAEq">shadow mapping</a>. </p><p>Projective texture mapping is essentially a special <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a> <a href="/facts/Coordinate_system/Mtd0q4SP">transformation</a> which is performed per-vertex and then linearly interpolated as standard texture mapping. </p>