V

vertex split
A vertex split adds a new vertex near an existing vertex and adds two new faces. Thus, a complex mesh can be built from a simple mesh and a sequence of vertex split records that increasingly refine the mesh. This allows meshes to be progressively downloaded from remote sites.
viewing frustum
A 3-D volume in a scene positioned relative to the viewport's camera. Objects within the frustum are visible. For perspective viewing, the viewing frustum is the volume of an imaginary pyramid that is between the front clipping plane and the back clipping plane. For orthographic viewing, the viewing frustum is cuboid.

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