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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
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> |