计算机图形学网络课程

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<p align=center style='text-align:center'><b><span lang=EN-US style='font-size:
18.0pt;color:green'>3.2</span><span lang=EN-US style='color:green'> </span></b><b><span
style='font-size:18.0pt;font-family:仿宋_GB2312;color:green'>形体在计算机内的表示</span></b></p>

<p style='line-height:200%'><span lang=EN-US style='mso-ascii-font-family:楷体_GB2312;
mso-fareast-font-family:楷体_GB2312'>&nbsp;&nbsp;&nbsp;</span><span lang=EN-US
style='font-family:楷体_GB2312'> 我们已经知道：计算机中表示形体，通常用<span style='color:maroon'>线框</span>、<span
style='color:maroon'>表面</span>和<span style='color:maroon'>实体</span>三种模型。线框模型和表面模型保存的三维形体信息都不完整，只有实体模型才能够完整地、无歧义地表示三维形体。前面我们已经介绍了曲线、曲面常用的的表示形式及其理论基础，从本小节开始，我们介绍实体造型技术的有关问题，主要包括形体在计算机内的表示、分类求交算法和典型的实体造型系统。</span><span
lang=EN-US> </span></p>

<p><b><span lang=EN-US style='font-size:10.0pt;font-family:幼圆;color:gray'><a