the basal part of a solid cone or pyramid formed by cutting off the top by a plane parallel to the base; the part of a solid intersected between two usually parallel planes
Computer-generated objects can be projected into an artificial viewing area, called a frustum A frustum is in the form of a truncated pyramid, shown in Figure 5-3, between the base of the viewing volume, called the far plane, and the near plane
The portion of a regular solid left after cutting off the upper part by a plane parallel to the base; or the portion intercepted between two planes, either parallel or inclined to each other
The viewing frustum for a Camera defines the volume of 3D space that is rendered This is defined in terms of a front clipping distance, far clipping distance and the size of the rectangle at the front clipping distance P01