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Also, if you rotate a Target camera to a nearly vertical position, either up or
down, the program must flip the Camera view to prevent the up-vector from
becoming undefined. If you need a camera to look vertically upward or
downward, use a Free camera.
In a Camera viewport, you can also use the
navigation buttons on page 7604 to
adjust the camera interactively. Some navigation buttons, such as Dolly and
Orbit actually move the camera or its target.
Using Clipping Planes to Exclude Geometry
Clipping planes let you exclude some of a scene’s geometry and view or render
only certain portions of the scene. Each camera object has a near and a far
clipping plane. Objects closer than the near clipping plane or farther than the
far clipping plane are invisible to the camera.
Clipping planes are useful for rendering selected portions of a scene that has
a lot of complex geometry. They can also help you create cutaway views.
Left: Clipping plane excludes the foreground chair and the front of the table.
Right: Clipping plane excludes the background chair and the rear of the table.
5222 | Chapter 18 Lights and Cameras