upstream-man-pages/man2/xhtml/gluSphere.xml

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   3 <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>gluSphere</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="gluSphere"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gluSphere — draw a sphere</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">gluSphere</b>(</code></td><td>GLUquadric*  </td><td><var class="pdparam">quad</var>, </td></tr><tr><td> </td><td>GLdouble  </td><td><var class="pdparam">radius</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">slices</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">stacks</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>quad</code></em></span></dt><dd><p>
   4                     Specifies the quadrics object (created with <a class="citerefentry" href="gluNewQuadric.xml"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>).
   5                 </p></dd><dt><span class="term"><em class="parameter"><code>radius</code></em></span></dt><dd><p>
   6                     Specifies the radius of the sphere.
   7                 </p></dd><dt><span class="term"><em class="parameter"><code>slices</code></em></span></dt><dd><p>
   8                     Specifies the number of subdivisions around the <span class="emphasis"><em>z</em></span> axis
   9                     (similar to lines of longitude).
  10                 </p></dd><dt><span class="term"><em class="parameter"><code>stacks</code></em></span></dt><dd><p>
  11                     Specifies the number of subdivisions along the <span class="emphasis"><em>z</em></span> axis
  12                     (similar to lines of
  13                     latitude).
  14                 </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
  15             <code class="function">gluSphere</code> draws a sphere of the given radius centered around the origin. The
  16             sphere is subdivided around the <span class="emphasis"><em>z</em></span> axis into slices and along the
  17             <span class="emphasis"><em>z</em></span> axis
  18             into stacks (similar to lines of longitude and latitude).
  19         </p><p>
  20             If the orientation is set to <code class="constant">GLU_OUTSIDE</code>
  21             (with <a class="citerefentry" href="gluQuadricOrientation.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricOrientation</span></span></a>), then any normals generated
  22             point away from the center of the sphere.
  23             Otherwise, they point toward the center of the sphere.
  24         </p><p>
  25             If texturing is turned on (with <a class="citerefentry" href="gluQuadricTexture.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricTexture</span></span></a>), then texture
  26             coordinates are
  27             generated so that <span class="emphasis"><em>t</em></span> ranges from 0.0 at
  28             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  29
  30                 <mml:mrow>
  31                     <mml:mi mathvariant="italic">z</mml:mi>
  32                     <mml:mo>=</mml:mo>
  33                     <mml:mrow>
  34                         <mml:mo>-</mml:mo>
  35                         <mml:mi mathvariant="italic">radius</mml:mi>
  36                     </mml:mrow>
  37                 </mml:mrow>
  38             </mml:math>
  39             to 1.0 at
  40             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  41
  42                 <mml:mrow>
  43                     <mml:mi mathvariant="italic">z</mml:mi>
  44                     <mml:mo>=</mml:mo>
  45                     <mml:mi mathvariant="italic">radius</mml:mi>
  46                 </mml:mrow>
  47             </mml:math>
  48             (<span class="emphasis"><em>t</em></span> increases linearly along longitudinal
  49             lines),
  50             and <span class="emphasis"><em>s</em></span> ranges from 0.0 at the +<span class="emphasis"><em>y</em></span> axis, to 0.25 at the
  51             +<span class="emphasis"><em>x</em></span> axis,
  52             to 0.5 at the \-<span class="emphasis"><em>y</em></span> axis, to 0.75 at the \-<span class="emphasis"><em>x</em></span> axis, and back to 1.0
  53             at the +<span class="emphasis"><em>y</em></span> axis.
  54         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
  55             <a class="citerefentry" href="gluCylinder.xml"><span class="citerefentry"><span class="refentrytitle">gluCylinder</span></span></a>,
  56             <a class="citerefentry" href="gluDisk.xml"><span class="citerefentry"><span class="refentrytitle">gluDisk</span></span></a>,
  57             <a class="citerefentry" href="gluNewQuadric.xml"><span class="citerefentry"><span class="refentrytitle">gluNewQuadric</span></span></a>,
  58             <a class="citerefentry" href="gluPartialDisk.xml"><span class="citerefentry"><span class="refentrytitle">gluPartialDisk</span></span></a>,
  59             <a class="citerefentry" href="gluQuadricOrientation.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricOrientation</span></span></a>,
  60             <a class="citerefentry" href="gluQuadricTexture.xml"><span class="citerefentry"><span class="refentrytitle">gluQuadricTexture</span></span></a>
  61         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
  62             Copyright <span class="trademark"></span>© 1991-2006
  63             Silicon Graphics, Inc. This document is licensed under the SGI
  64             Free Software B License. For details, see
  65             <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
  66         </p></div></div></body></html>