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Polygon is a flat surface on a 3d model, defined by a series of vertices.

Most game engines use polygons to make the surfaces of their objects. A polygon can be made up of 1 or more triangles, like a quad is made of two triangles, a pentagon is made of three triangles, etc. Some engines support multiple polygon types, but triangles are the most common.

Some people use the term polygon to specify a quad, others use it when talking about triangles. Polygons are also called polys, or sometimes N-gons. See also Face, Fan, Quad, Strip.

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