The method of three-planes projection graph created by 3D spatial graph is discussed. It solve the difficult in drawing projection graph.
论述三维立体图生成三面投影图的方法，解决在绘制投影图中的困难。
Then, the basic principles of drawing 3d graph by computer are discussed, particularly explained the fundamental theory of coordinate transform, projection transform and light model.
对三维图形计算机显示的基本原理进行了讨论，详细介绍了坐标系变换、投影变换和明暗处理及光照模型的基本原理。
By adapting matrix calculation method for using MATLAB drawing graph technology, 2d and 3d function graphs could be drawn, which is widely applied for science research and engineering technology.
MATLAB图形技术采用矩阵运算方法，可以方便地绘制出各种二维和三维图形，广泛用于科学研究和工程技术。
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