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Chapter 5. Matrix Transformations Are Yo... > Projection Transformations

Projection Transformations

Orthographic Projection

OpenGL provides two methods of converting 3D images into 2D ones. The first is called orthographic, or parallel, projection and is illustrated in Figure 5.12. You use this style of projection to maintain the scale of objects and their angles without regard to their apparent distance. This is particularly useful for architectural drawings and for charting data; in both instances you need to retain lengths and sizes regardless of the distance from the viewpoint. As you can see from the figure, no matter how far distant the objects are from the viewing plane, their relative sizes do not change.

Figure 5.12. Orthographic Viewing Volume and Its Parameters



  

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