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Chapter 22. Viewing 3D Drawings > Displaying Parallel and Perspective Projectio...

22.4. Displaying Parallel and Perspective Projections

You may have noticed when you open AutoCAD with the default 3D environment that the grid lines look like they're receding into the distance. That's because AutoCAD is displaying a perspective view, which makes parallel lines converge as they get farther away. Because this is how parallel lines look in real life (try looking down a road into the distance), a perspective view looks more realistic than a parallel view that keeps lines parallel, regardless of their distance. However, when you zoom in, objects may appear distorted. Use a perspective view when you want to convey a realistic sense of depth. In general, perspective view is most useful in architectural settings. AutoCAD LT doesn't include perspective projections. The PERSPECTIVE system variable controls the current view. A value of 0 turns off perspective view; 1 turns it on.


  

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