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<td class="tinylogo" height="130" width="326"><img alt="NeHe Productions" src="Tutorial_42_files/logo.png" height="130" width="326"></td>
<td align="center" valign="center"><div align="center"><font class="text"><font class="theme" size="+3"><b><i>第 42课</i></b></font></font></div></td>
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<td width="21%"><img src="Tutorial_42_files/lesson42.jpg" height="120" width="160"></td>
<td width="79%"><p><font><b>多重视口</b></font></p>
<p><font>画中画效果,很酷吧。使用视口它变得很简单,但渲染四次可会大大降低你的显示速度哦:)</font></p></td>
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<td class="back3" valign="top" width="100%">欢
迎来到充满趣味的另一课。这次我将向你展示怎样在单个窗口内显示多个视口。这些视口在窗口模式下能正确的调整大小。其中有两个窗口起用了光照。窗口之一用
的是正交投影而其他三个则是透视投影。为了保持教程的趣味性,在本例子中我们同样需要学习迷宫代码,怎么渲染到一张纹理以及怎么得到当前窗口的分辨率。<br>
一旦你明白了本教程,制作分屏游戏以及多视图的3D程序就很简单了。接下来,让我们投入到代码中来吧!!!<br>
你可以利用最近的NeHeGL或者IPicture代码作为主要基本代码。我们需要看的第一个文件就是NeHeGL.cpp,其中有三节代码已经被修改了。我将只列出那些被修改了的代码。<br>
第一个且最重要的被修改了的代码就是ReshapeGL()函数。这是我们设置屏幕(主视口)分辨率的地方。现在所有的主视口设置都在画循环里完成了。因此这儿所有我们能做的就是设置我们的主窗口。</td>
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