In 3D computer graphics, hidden-surface determination (also known as shown-surface determination, hidden-surface removal (HSR), occlusion culling (OC) or visible-surface determination (VSD)) is the process of identifying what surfaces and parts of surfaces can be seen from a particular viewing angle. A hidden-surface determination algorithm is a solution to the visibility problem, which was one of the first major problems in the field of 3D computer graphics. The process of hidden-surface determination is sometimes called hiding, and such an algorithm is sometimes called a hider. When referring to line rendering it is known as hidden-line removal. Hidden-surface determination is necessary to render a scene correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible.

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    Mini 14 flash hider issue

    I recently bought a used Mini 14, and while slightly used I was mostly quite pleased with the condition. The barrel has been cut and a flash hider pinned and welded, and the other night while inspecting it, I noticed that the alignment of the site, and thus the hider were not at 12 o'clock, but...
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