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Chapter 9: Viewing the Scene Figure 9-4 Perspective Explained If you compare the height of an object in the near clipping plane to the height of the near clipping plane, you see that the ratio is larger than the ratio of the height of the same object in the far clipping plane to the height of the far clipping plane. Hobject -------Hnear Hobject > -------Hfar Consequently, when you compare the size of the object to its surroundings, it appears smaller in the distance. Setting the Frustum The frustum is the truncated pyramidal volume depicted in Figure 9-2. It is defined by four quantities, as shown in Figure 9-5: 102 • Distance to the near clip plane. • Distance to the far clip plane. • Horizontal field of view. • Vertical field of view.
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