However, I thought that the view frustum was a pyramid, and so perspective projection would shrink things as they drifted away from the camera (and thus, the front of the frustum).

What does viewing frustum actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia. ... In 3D graphics, it is the area that is within the view of the user.

Frustum tracing means that the primitives of occluding objects are ray-traced from the light’s point of view to form a shadow on the receiving surfaces. It is a form of ray tracing and, as such ...