因此，寻求新的技术和计算机辅助设计的方法成为必然趋势。
Therefore, the inevitable trend is searching for new technology and computer assistant design methods.
第一章，介绍了道路光环境和计算机辅助设计的背景以及课题意义；
The first chapter discussed the realistic meaning of the application of computer aid design in the lighting design of roadway.
圆柱体相贯线上的圆角表示方法是CAD和计算机辅助设计中众所周知的难题。
The solid modeling of the fillet on the intersection line of two cylinders is a difficult problem in CAD and CAM, all the soft wears have no such function.
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