Front/Back face culling

Unlike a piece of paper surfaces in 3d usually only have one side, so a piece of paper in 3d would look like a white square from one side and be invisible from the other. Which side is visible can be switched to be the oposite, and you can also make it visible on both sides. Having both sides visible however is usually a waste of computing power as on most models you only ever see the one side. Though a few cad/architecture softwares does assume both sides are visible and would appear to be "missing" parts in our software without the correct settings.
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