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A 3D primitive is a collection of vertices that form a single 3D entity.
The simplest primitive is a collection of points in a 3D coordinate system, which is called a point list.
Often, 3D primitives are polygons.
A polygon is a closed 3D figure delineated by at least three vertices.
The simplest polygon is a triangle.
Microsoft Direct3D uses triangles to compose most of its polygons because all three vertices in a triangle are guaranteed to be coplanar. Rendering nonplanar vertices is inefficient.
You can combine triangles to form large, complex polygons and meshes. |
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