Frustum object
A camera's viewing volume can be represented by a frustum. A frustum is made up of six planes, visually it looks like a pyramid with its peek truncated:
The frustum is composed of the top, bottom, left, right, near, and far planes. The normal of each plane points inward, towards the center of the frustum:
Having a view Frustum is very useful in graphics. We can use the frustum to render only what is visible to the camera. We don't need a Frustum primitive for our engine to work, but it is a very useful primitive to have in our toolbox. ...
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