Perspective Projection: The Closer, the Bigger
Until now, we have always used an orthographic projection, meaning that no matter how far an object is from the near clipping plane, it will always have the same size on the screen. Our eyes show us a different picture of the world. The further away an object is, the smaller it appears to us. This is called perspective projection, which was discussed a little in Chapter 4.
The difference between an orthographic projection and a perspective projection can be explained by the shape of the view frustum. In an orthographic projection, there is a box. In a perspective projection, there is a pyramid with a cut-off top as the near clipping plane, the pyramid's base as the far clipping plane, and its sides ...
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