This paper is part of the interactive computer graphics software of ICGS-80 System.
本文是交互式计算机图形软件ICGS—80系统中的组成部分。
This paper is practical for the theoretical research of computer graphics.
它对计算机图学的理论研究，具有实际意义。
This paper is practical for the theoretical research of computer graphics.
它对计算机图学的理论研究，具有实际意义。
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