Misc/abrash-black-book
Watch
1
0
Fork
You've already forked abrash-black-book
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Retidy, removing align=left from headings and empty paragraphs

Browse source
This commit is contained in:
James Gregory 2013-12-30 15:37:13 +11:00
commit a96a114403
362 changed files with 8472 additions and 5040 deletions
Download patch file Download diff file Expand all files Collapse all files

31
70-03.html
View file

@ -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="70-02.html">Previous</a></td>
<td>
<a href="70-02.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="70-04.html">Next</a></td>
<td>
<a href="70-04.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h3 id="Heading4">Passages: The Last-Minute Change that Didn&rsquo;t Happen</h3>
<p>Earlier, I mentioned that we almost changed 3-D engines again in the last month of Quake&rsquo;s development. Here&rsquo;s what happened: One of the alternatives to the PVS is the use of <i>portals</i>, where the focus is on the places where polygons don&rsquo;t exist along leaf faces, rather than the more usual focus on the polygons themselves. These &ldquo;empty&rdquo; places are themselves polygons, called portals, that describe all the places that visibility can pass from one leaf to another. Portals are used by the PVS generator to determine visibility, and are used in other 3-D engines as the primary mechanism for determining leaf or sector visibility. For example, portals can be projected to screenspace, then used as a 2-D clipping region to restrict drawing of more distant polygons to only those that are visible through the portal. Or, as in Quake&rsquo;s preprocessor, visibility boundary planes can be constructed from one portal to the next, and 3-D clipping to those planes can be used to determine visible polygons or leaves. Used either way, portals can support more changeable worlds than the PVS, because, unlike the PVS, the portals themselves can easily be changed on the fly.</p>
@ -58,16 +61,20 @@
</tr>
</table>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="70-02.html">Previous</a></td>
<td>
<a href="70-02.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="70-04.html">Next</a></td>
<td>
<a href="70-04.html">Next</a>
</td>
</tr>
</table>
</center>