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Retidy, removing align=left from headings and empty paragraphs

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James Gregory 2013-12-30 15:37:13 +11:00
commit a96a114403
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51-01.html
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@ -1,5 +1,4 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
@ -19,17 +18,21 @@
<center>
<table border="1">
<tr>
<td><a href="50-07.html">Previous</a></td>
<td>
<a href="50-07.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="51-02.html">Next</a></td>
<td>
<a href="51-02.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h2 id="Heading1">Chapter 51<br />
Sneakers in Space</h2>
@ -57,16 +60,20 @@
<p>One of the drawbacks of the previous chapter&rsquo;s approach was that the polygon had two visible sides. Why is that a drawback? It isn&rsquo;t, necessarily, but in our case we want to use polygons to build solid objects with continuous surfaces, and in that context, only one side of a polygon is visible; the other side always faces the inside of the object, and can never be seen. It would save time and simplify the process of hidden surface removal if we could quickly and easily determine whether the inside or outside face of each polygon was facing us, so that we could draw each polygon only if it were visible (that is, had the outside face pointing toward the viewer). On average, half the polygons in an object could be instantly rejected by a test of this sort. Such testing of polygon visibility goes by a number of names in the literature, including backplane culling, backface removal, and assorted variations thereon; I&rsquo;ll refer to it as <i>backface removal</i>.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="50-07.html">Previous</a></td>
<td>
<a href="50-07.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="51-02.html">Next</a></td>
<td>
<a href="51-02.html">Next</a>
</td>
</tr>
</table>
</center>