One of the advantages of 3D graphics over 2D graphics is the possibility of walking through the virtual scene and rotating objects in a way we do in real life. So the user feels as though he or she were inside that scene, observing real objects. The navigating in space is achieved using a camera. It is a special object that controls the way of projecting 3D points to 2D points on the screen.

In openFrameworks, a camera can be represented by the ofCamera class or the ofEasyCam class. The first class is a quite general camera class, and the second one extends it by implementing a number of additional capabilities, including handling mouse events for controlling the camera.