Computer Graphics in Computer-Aided Design Manufacturing - CAD/CAM

摘要

To build three-dimensional views from a model in a CAD application, the software must first be provided with a viewpoint that represents the observer. With such information about the viewpoint, the computer can determine which surfaces of the CAD model would be observable from that particular perspective. The typical approach to sorting visible surfaces starts with those nearest to the viewer and works back. The closest objects block the view of some objects farther away and so forth.