Remove hint.html and index.html
As per discussions on GitHub the index.html and hint.html files should be deleted in favour of README.md files (from any .text/.txt/.markdown/.md files which will be turned into README.md in an upcoming commit).
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="GENERATOR" content="mkd2html 2.1.5a DL=DISCOUNT">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<link rel="stylesheet"
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type="text/css"
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href="../hint.css">
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<title>Most solid</title>
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</head>
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<body>
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<h1>Most solid</h1>
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<p>Yusuke Endoh<br>
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<a href="mailto:mame@ruby-lang.org">mame@ruby-lang.org</a><br>
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<a href="https://github.com/mame/">https://github.com/mame/</a></p>
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<h2>Judges' comments:</h2>
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<h3>To build:</h3>
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<pre><code>make endoh4
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</code></pre>
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<h3>To run:</h3>
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<pre><code>./endoh4
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</code></pre>
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<h3>Try:</h3>
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<p>NOTE: The author recommends the use of xterm.</p>
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<pre><code>./endoh4 < cube.txt
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</code></pre>
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<p>For example, if you are a soccer fan, try:</p>
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<pre><code>make all
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./endoh4 < solids/archimedian-solid/a11-truncated-icosahedron.txt
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</code></pre>
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<h3>Selected Judges Remarks:</h3>
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<p>This program is formatted as the net for a tetrahedron. (hint, try feeding the
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program it’s own source code). When it runs there is an animation for the
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computation to work out the convex hull.</p>
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<h2>Author’s comments:</h2>
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<h3>Spec</h3>
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<p>This is a convex polyhedron viewer, which:</p>
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<ol>
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<li>reads three-dimentional vertices (3N float values) from stdin,</li>
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<li>calculates a convex hull of them, and</li>
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<li>renders it.</li>
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</ol>
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<p>This simple spec involves many details.</p>
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<ul>
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<li>3D convex hull calculation
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<ul>
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<li>recursive gift wrapping algorithm</li>
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<li>automatical merging of (almost) co-planar faces
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(i.e., faces are not triangulated)</li>
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<li>random perturbation for robustness</li>
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</ul>
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</li>
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<li>3D rendering
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<ul>
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<li>perspective projection</li>
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<li>ASCII line drawing: <code>"',;;;,;'"</code></li>
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<li>camera in a spherical spiral orbit</li>
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</ul>
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</li>
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</ul>
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<p>(Note that this program does not use <code>math.h</code>.)</p>
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<h3>Portability</h3>
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<p>I think it conforms with both C89 and C99.
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I confirmed that it worked on gcc, clang, and tcc.
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It should not be warned with -pedantic and -Wextra.</p>
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<h3>Tips</h3>
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<p>You may want to use <code>tput</code> to hide a terminal cursor.</p>
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<pre><code>tput civis
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./endoh4 < cube.txt
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tput cnorm
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</code></pre>
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<h3>Bonuses</h3>
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<p>You can change the screen size. Let the aspect ratio be about 3:1.</p>
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<pre><code>gcc -DS=120,40 -o endoh4 endoh4.c
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</code></pre>
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<p>The shape of this code is the geometric net of a regular tetrahedron.
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So, try:</p>
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<pre><code>./endoh4 < endoh4.c
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</code></pre>
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<p>The solids.tbz2 file includes various solid data:
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<a href="http://en.wikipedia.org/wiki/Platonic_solid">Platonic solids</a>,
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<a href="http://en.wikipedia.org/wiki/Archimedean_solid">Archimedean solids</a>,
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<a href="http://en.wikipedia.org/wiki/Prism_%28geometry%29">Prisms</a>,
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<a href="http://en.wikipedia.org/wiki/Antiprism">Antiprisms</a>,
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<a href="http://en.wikipedia.org/wiki/Bipyramid">Bipyramids</a>,
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<a href="http://en.wikipedia.org/wiki/Trapezohedron">Trapezohedrons</a>, and
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<a href="http://en.wikipedia.org/wiki/Johnson_solid">Johnson solids</a>.</p>
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<p>I created the files by using the POV-Ray scripts
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(<a href="http://en.wikipedia.org/wiki/File:Poly.pov">1</a> and
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<a href="http://en.wikipedia.org/wiki/User:AndrewKepert/poly.pov">2</a>)
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in Wikipedia.
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They are copyrighted in CC BY-SA 3.0
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by “User:Cyp” and “User:AndrewKepert”.</p>
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<hr />
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<TABLE><TR>
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<TD><a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/88x31.png" /></a></TD>
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<TD><P>© Copyright 1984-2015,
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<A HREF="/judges.html">Leo Broukhis, Simon Cooper, Landon Curt Noll</A>
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- All rights reserved<BR>
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This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.</P></TD>
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<TD> <!--<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>--></TD>
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</TR></TABLE>
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</body>
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</html>
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