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Graphics pipeline
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==== Clipping ==== [[File:Cube clipping.svg|thumb|Clipping of primitives against the cube. The blue triangle is discarded while the orange triangle is clipped, creating two new vertices.]] [[File:Frustum.png|thumb|Frustum]] Only the primitives that are within the visual volume need to be [[rasterization|rastered]] (drawn). This visual volume is defined as the inside of a [[frustum]], a shape in the form of a pyramid with a cut-off top. Primitives that are completely outside the visual volume are discarded; This is called [[frustum culling]]. Further culling methods such as back-face culling, which reduces the number of primitives to be considered, can theoretically be executed in any step of the graphics pipeline. Primitives that are only partially inside the cube must be [[clipping (computer graphics)|clipped]] against the cube. The advantage of the previous projection step is that the clipping always takes place against the same cube. Only the β possibly clipped β primitives, which are within the visual volume, are forwarded to the final step.
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