
<refentry id="gluCylinder">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>gluCylinder</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>gluCylinder</refname>
        <refpurpose>draw a cylinder</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>gluCylinder</function></funcdef>
                <paramdef>GLUquadric* <parameter>quad</parameter></paramdef>
                <paramdef>GLdouble <parameter>base</parameter></paramdef>
                <paramdef>GLdouble <parameter>top</parameter></paramdef>
                <paramdef>GLdouble <parameter>height</parameter></paramdef>
                <paramdef>GLint <parameter>slices</parameter></paramdef>
                <paramdef>GLint <parameter>stacks</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <!-- eqn: ignoring delim $$ -->
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>quad</parameter></term>
            <listitem>
                <para>
                    Specifies the quadrics object (created with <citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>).
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>base</parameter></term>
            <listitem>
                <para>
                    Specifies the radius of the cylinder at <emphasis>z</emphasis> = 0.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>top</parameter></term>
            <listitem>
                <para>
                    Specifies the radius of the cylinder at <emphasis>z</emphasis> = <parameter>height</parameter>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>height</parameter></term>
            <listitem>
                <para>
                    Specifies the height of the cylinder.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>slices</parameter></term>
            <listitem>
                <para>
                    Specifies the number of subdivisions around the <emphasis>z</emphasis> axis.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>stacks</parameter></term>
            <listitem>
                <para>
                    Specifies the number of subdivisions along the <emphasis>z</emphasis> axis.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>gluCylinder</function> draws a cylinder oriented along the <emphasis>z</emphasis> axis. The base of the cylinder
            is placed at <emphasis>z</emphasis> = 0 and the top at 
            <inlineequation><mml:math>
                <!-- eqn: z  =  height:-->
                <mml:mrow>
                    <mml:mi mathvariant="italic">z</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mi mathvariant="italic">height</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>.
            Like a sphere,
            a cylinder is subdivided around the <emphasis>z</emphasis> axis into slices and along the 
            <emphasis>z</emphasis> axis into stacks.
        </para>
        <para>
            Note that if <parameter>top</parameter> is set to 0.0, this routine generates a cone.
        </para>
        <para>
            If the orientation is set to <constant>GLU_OUTSIDE</constant> 
            (with <citerefentry><refentrytitle>gluQuadricOrientation</refentrytitle></citerefentry>), then any generated normals
            point away from the <emphasis>z</emphasis> axis. Otherwise, they point toward the 
            <emphasis>z</emphasis> axis.
        </para>
        <para>
            If texturing is turned on (with <citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>), then texture 
            coordinates are generated so that <emphasis>t</emphasis> ranges linearly from 0.0 
            at <emphasis>z</emphasis> = 0 to 1.0 at <emphasis>z</emphasis> = <parameter>height</parameter>, and <emphasis>s</emphasis> 
            ranges from 0.0 at the +<emphasis>y</emphasis> axis, to 0.25 at the +<emphasis>x</emphasis> axis, 
            to 0.5 at the -<emphasis>y</emphasis> axis, to 0.75 at the \-<emphasis>x</emphasis> axis, 
            and back to 1.0 at the +<emphasis>y</emphasis> axis.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>gluDisk</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>gluPartialDisk</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>, 
            <citerefentry><refentrytitle>gluSphere</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
        </para>
    </refsect1>
</refentry>
