天天课堂 发表于 2009-8-27 09:56:00

三维旋转的方法

<table cellspacing="0" cellpadding="0"><tbody><tr><td class="t_msgfont" id="postmessage_447">打开文件，如图14-39左图所示。请将左图修改为右图，这个练习的目的是使读者掌握三维旋转的方法。<br/><img height="191" alt="" src="http://www.ttketang.com/home/attachment/200908/27/113_1251332660KK67.png" width="412"/><br/>14-39三维旋转<br/>1.&nbsp; &nbsp; &nbsp; &nbsp; 移动及复制对象，结果如图14-40所示。<br/><img height="170" alt="" src="http://www.ttketang.com/home/attachment/200908/27/113_125133265897HA.png" width="264"/><br/>14-40移动及复制对象<br/>2.&nbsp; &nbsp; &nbsp; &nbsp; 将对象绕轴线旋转，结果如图14-41所示。<br/>命令: _rotate3d<br/>选择对象: 找到 1 个&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择对象<br/>选择对象:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //按Enter键<br/>指定轴上第一个点或定义轴依据[对象(O)/ X 轴(X)/Y 轴(Y)/Z 轴(Z)/两点(2)]: y<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //设定y 轴为旋转轴<br/>指定 Y 轴上的点 &lt;0,0,0&gt;: cen于&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉圆心A<br/>指定旋转角度或 [参照(R)]: -75&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入旋转角度<br/>结果如图14-41所示。<br/><img height="182" alt="" src="http://www.ttketang.com/home/attachment/200908/27/113_1251332660wBwb.png" width="323"/><br/>14-41旋转对象<br/>知识点：使用ROTATE3D命令时，用户应注意确定旋转轴的正方向。当设定坐标轴是旋转轴时，坐标轴的方向就是旋转轴的正方向，若用户通过两点来指定旋转轴，那么轴的正方向是从第一个选取点指向第二个选取点。</td></tr></tbody></table>本教程转自<a href="http://www.ttketang.com/">http://www.ttketang.com/</a>
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