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Clipping a triangle or a convex quadrilateral to a plane is a common operation in computer graphics. This clipping is implemented by fixed-function units within the graphics pipeline under most rasterization APIs. It is increasingly interesting to perform clipping in programmable stages as well. For example, to clip bounding volumes generated in the Geometry unit to the near plane, or to clip an area light source to the tangent plane of a surface in a Pixel unit. While clipping a convex polygondoi:10.1080/2151237x.2011.619891 fatcat:fiwrfoixcnewjosxw7cnwjgcsm