
<refentry id="glEvalMesh">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glEvalMesh</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glEvalMesh</refname>
        <refpurpose>compute a one- or two-dimensional grid of points or lines</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glEvalMesh1</function></funcdef>
                <paramdef>GLenum <parameter>mode</parameter></paramdef>
                <paramdef>GLint <parameter>i1</parameter></paramdef>
                <paramdef>GLint <parameter>i2</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <!-- eqn: ignoring delim $$ -->
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>mode</parameter></term>
            <listitem>
                <para>
                    In <function>glEvalMesh1</function>, specifies whether to compute a one-dimensional mesh of points or lines.
                    Symbolic constants
                    <constant>GL_POINT</constant> and
                    <constant>GL_LINE</constant> are accepted.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>i1</parameter></term>
            <term><parameter>i2</parameter></term>
            <listitem>
                <para>
                    Specify the first and last integer values for grid domain variable 
                    <inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glEvalMesh2</function></funcdef>
                <paramdef>GLenum <parameter>mode</parameter></paramdef>
                <paramdef>GLint <parameter>i1</parameter></paramdef>
                <paramdef>GLint <parameter>i2</parameter></paramdef>
                <paramdef>GLint <parameter>j1</parameter></paramdef>
                <paramdef>GLint <parameter>j2</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters2"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>mode</parameter></term>
            <listitem>
                <para>
                    In <function>glEvalMesh2</function>, specifies whether to compute a two-dimensional mesh of points, lines,
                    or polygons.
                    Symbolic constants
                    <constant>GL_POINT</constant>,
                    <constant>GL_LINE</constant>, and
                    <constant>GL_FILL</constant> are accepted.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>i1</parameter></term>
            <term><parameter>i2</parameter></term>
            <listitem>
                <para>
                    Specify the first and last integer values for grid domain variable 
                    <inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>j1</parameter></term>
            <term><parameter>j2</parameter></term>
            <listitem>
                <para>
                    Specify the first and last integer values for grid domain variable 
                    <inlineequation><mml:math><mml:mi mathvariant="italic">j</mml:mi></mml:math></inlineequation>.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <citerefentry><refentrytitle>glMapGrid</refentrytitle></citerefentry> and <function>glEvalMesh</function> are used in tandem to efficiently
            generate and evaluate a series of evenly-spaced map domain values.
            <function>glEvalMesh</function> steps through the integer domain of a one- or two-dimensional grid,
            whose range is the domain of the evaluation maps specified by
            <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>.
            <parameter>mode</parameter> determines whether the resulting vertices are connected as
            points,
            lines,
            or filled polygons.
        </para>
        <para>
            In the one-dimensional case,
            <function>glEvalMesh1</function>,
            the mesh is generated as if the following code fragment were executed:
        </para>
        <para>
            <programlisting>
glBegin( <parameter>type</parameter> );
for ( i = <parameter>i1</parameter>; i &lt;= <parameter>i2</parameter>; i += 1 )
   glEvalCoord1( <mml:math>
   		      <!-- eqn: i \cdot DELTA u + u sub 1 :-->
		      <mml:mrow>
		          <mml:mrow>
		              <mml:mn>i</mml:mn>
			      <mml:mo>&CenterDot;</mml:mo>
			      <mml:mo>&Delta;</mml:mo>
		              <mml:mi mathvariant="italic">u</mml:mi>
		          </mml:mrow>
		          <mml:mo>+</mml:mo>
		          <mml:msub>
		              <mml:mi mathvariant="italic">u</mml:mi>
		              <mml:mn>1</mml:mn>
		          </mml:msub>
		      </mml:mrow>
		  </mml:math> );
glEnd();
            </programlisting>
            where
        </para>
        <para>
            <informalequation><mml:math>
                <!-- eqn: DELTA u  =  (u sub 2  -  u sub 1 )  /  n:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mo>&Delta;</mml:mo>
                        <mml:mi mathvariant="italic">u</mml:mi>
                    </mml:mrow>
                    <mml:mo>=</mml:mo>
                    <mml:mfrac>
                        <mml:mfenced open="(" close=")">
                            <mml:mrow>
                                <mml:msub>
				    <mml:mi mathvariant="italic">u</mml:mi>
                                    <mml:mn>2</mml:mn>
                                </mml:msub>
                                <mml:mo>-</mml:mo>
                                <mml:msub>
				    <mml:mi mathvariant="italic">u</mml:mi>
                                    <mml:mn>1</mml:mn>
                                </mml:msub>
                            </mml:mrow>
                        </mml:mfenced>
                        <mml:mi mathvariant="italic">n</mml:mi>
                    </mml:mfrac>
                </mml:mrow>
            </mml:math></informalequation>
        </para>
        <para>
            and 
            <inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>, 
            <inlineequation><mml:math>
                <!-- eqn: u sub 1:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>1</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>,
            and 
            <inlineequation><mml:math>
                <!-- eqn: u sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>
            are the arguments to the most recent
            <citerefentry><refentrytitle>glMapGrid1</refentrytitle></citerefentry> command.
            <emphasis>type</emphasis> is <constant>GL_POINTS</constant> if <parameter>mode</parameter> is <constant>GL_POINT</constant>,
            or <constant>GL_LINES</constant> if <parameter>mode</parameter> is <constant>GL_LINE</constant>.
        </para>
        <para>
            The one absolute numeric requirement is that if 
            <inlineequation><mml:math>
                <!-- eqn: i  =  n:-->
                <mml:mrow>
                    <mml:mi mathvariant="italic">i</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mi mathvariant="italic">n</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>,
            then the
            value computed from 
            <inlineequation><mml:math>
                <!-- eqn: i cdot DELTA u  +  u sub 1:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mi mathvariant="italic">i</mml:mi>
                        <mml:mo>&CenterDot;</mml:mo>
                        <mml:mrow>
                            <mml:mo>&Delta;</mml:mo>
                            <mml:mi mathvariant="italic">u</mml:mi>
                        </mml:mrow>
                    </mml:mrow>
                    <mml:mo>+</mml:mo>
                    <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                    <mml:mn>1</mml:mn>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            is exactly 
            <inlineequation><mml:math>
                <!-- eqn: u sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>.
        </para>
        <para>
            In the two-dimensional case, <function>glEvalMesh2</function>, let
            .cp
            <informalequation><mml:math>
                <!-- eqn: DELTA u  =    ( u sub 2  -  u sub 1 )  /  n:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mo>&Delta;</mml:mo>
                        <mml:mi mathvariant="italic">u</mml:mi>
                    </mml:mrow>
                    <mml:mo>=</mml:mo>
                    <mml:mfrac>
                        <mml:mfenced open="(" close=")">
                            <mml:mrow>
                                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                                <mml:mn>2</mml:mn>
                                </mml:msub>
                                <mml:mo>-</mml:mo>
                                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                                <mml:mn>1</mml:mn>
                                </mml:msub>
                            </mml:mrow>
                        </mml:mfenced>
                        <mml:mi mathvariant="italic">n</mml:mi>
                    </mml:mfrac>
                </mml:mrow>
            </mml:math></informalequation>
        </para>
        <para>
            <informalequation><mml:math>
                <!-- eqn: DELTA v  =    ( v sub 2  -  v sub 1 )  /  m:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mo>&Delta;</mml:mo>
                        <mml:mi mathvariant="italic">v</mml:mi>
                    </mml:mrow>
                    <mml:mo>=</mml:mo>
                    <mml:mfrac>
                        <mml:mfenced open="(" close=")">
                            <mml:mrow>
                                <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                                <mml:mn>2</mml:mn>
                                </mml:msub>
                                <mml:mo>-</mml:mo>
                                <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                                <mml:mn>1</mml:mn>
                                </mml:msub>
                            </mml:mrow>
                        </mml:mfenced>
                        <mml:mi mathvariant="italic">m</mml:mi>
                    </mml:mfrac>
                </mml:mrow>
            </mml:math></informalequation>
        </para>
        <para>
            where 
            <inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>, 
            <inlineequation><mml:math>
                <!-- eqn: u sub 1:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>1</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>, 
            <inlineequation><mml:math>
                <!-- eqn: u sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>, 
            <inlineequation><mml:math><mml:mi mathvariant="italic">m</mml:mi></mml:math></inlineequation>, 
            <inlineequation><mml:math>
                <!-- eqn: v sub 1:-->
                <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                <mml:mn>1</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>,
            and 
            <inlineequation><mml:math>
                <!-- eqn: v sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>
            are the
            arguments to the most recent <citerefentry><refentrytitle>glMapGrid2</refentrytitle></citerefentry> command.  Then, if
            <parameter>mode</parameter> is <constant>GL_FILL</constant>, the <function>glEvalMesh2</function> command is equivalent
            to:
        </para>
        <para>
            <programlisting>
for ( j = <parameter>j1</parameter>; j &lt; <parameter>j2</parameter>; j += 1 ) {
   glBegin( GL_QUAD_STRIP );
   for ( i = <parameter>i1</parameter>; i &lt;= <parameter>i2</parameter>; i += 1 ) {
      glEvalCoord2( <mml:math>
			<!-- i \cdot DELTA u + u sub 1 :-->
		        <mml:mrow>
			    <mml:mrow>
			        <mml:mn>i</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">u</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">u</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			    <mml:mo>,</mml:mo>
			    <!-- j \cdot DELTA v + v sub 1 :-->
			    <mml:mrow>
			        <mml:mn>j</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">v</mml:mi>

			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">v</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			</mml:mrow>
		    </mml:math> );
      glEvalCoord2( <mml:math>
			<!-- i \cdot DELTA u + u sub 1, :-->
		        <mml:mrow>
			    <mml:mrow>
			        <mml:mn>i</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">u</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">u</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			    <mml:mo>,</mml:mo>
			    <!-- (j + 1) \cdot DELTA v + v sub 1 :-->
			    <mml:mrow>
			        <mml:mrow>
				    <mml:mfenced open="(" close=")">
				        <mml:mrow>
			                    <mml:mn>j</mml:mn>
				            <mml:mo>+</mml:mo>
			                    <mml:mn>1</mml:mn>
				        </mml:mrow>
				    </mml:mfenced>
				</mml:mrow>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">v</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">v</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			</mml:mrow>
		    </mml:math> );
   }
   glEnd();
}
            </programlisting>
        </para>
        <para>
            If <parameter>mode</parameter> is <constant>GL_LINE</constant>, then a call to <function>glEvalMesh2</function> is equivalent to:
        </para>
        <para>
            <programlisting>
for ( j = <parameter>j1</parameter>; j &lt;= <parameter>j2</parameter>; j += 1 ) {
   glBegin( GL_LINE_STRIP );
   for ( i = <parameter>i1</parameter>; i &lt;= <parameter>i2</parameter>; i += 1 )
      glEvalCoord2( <mml:math>
			<!-- i \cdot DELTA u + u sub 1 :-->
		        <mml:mrow>
			    <mml:mrow>
			        <mml:mn>i</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">u</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">u</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			    <mml:mo>,</mml:mo>
			    <!-- i \cdot DELTA v + v sub 1 :-->
			    <mml:mrow>
			        <mml:mn>j</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">v</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">v</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			</mml:mrow>
		    </mml:math> );
   glEnd();
}

for ( i = <parameter>i1</parameter>;  i &lt;= <parameter>i2</parameter>; i += 1 ) {
   glBegin( GL_LINE_STRIP );
   for ( j = <parameter>j1</parameter>; j &lt;= <parameter>j1</parameter>; j += 1 )
      glEvalCoord2( <mml:math>
			<!-- i \cdot DELTA u + u sub 1 :-->
		        <mml:mrow>
			    <mml:mrow>
			        <mml:mn>i</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">u</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">u</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			    <mml:mo>,</mml:mo>
			    <!-- i \cdot DELTA v + v sub 1 :-->
			    <mml:mrow>
			        <mml:mn>j</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">v</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">v</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			</mml:mrow>
		    </mml:math> );
   glEnd();
}
            </programlisting>
        </para>
        <para>
            And finally, if <parameter>mode</parameter> is <constant>GL_POINT</constant>, then a call to
            <function>glEvalMesh2</function> is equivalent to:
        </para>
        <para>
            <programlisting>
glBegin( GL_POINTS );
for ( j = <parameter>j1</parameter>; j &lt;= <parameter>j2</parameter>; j += 1 )
   for ( i = <parameter>i1</parameter>; i &lt;= <parameter>i2</parameter>; i += 1 )
      glEvalCoord2( <mml:math>
			<!-- i \cdot DELTA u + u sub 1 :-->
		        <mml:mrow>
			    <mml:mrow>
			        <mml:mn>i</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">u</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">u</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			    <mml:mo>,</mml:mo>
			    <!-- i \cdot DELTA v + v sub 1 :-->
			    <mml:mrow>
			        <mml:mn>j</mml:mn>
				<mml:mo>&CenterDot;</mml:mo>
			        <mml:mo>&Delta;</mml:mo>
		                <mml:mi mathvariant="italic">v</mml:mi>
			    </mml:mrow>
		            <mml:mo>+</mml:mo>
		            <mml:msub>
		                <mml:mi mathvariant="italic">v</mml:mi>
		                <mml:mn>1</mml:mn>
		            </mml:msub>
			</mml:mrow>
		    </mml:math> );
glEnd();
            </programlisting>
        </para>
        <para>
            In all three cases, the only absolute numeric requirements are that if 
            <inlineequation><mml:math>
                <!-- eqn: i = n:-->
                <mml:mrow>
                    <mml:mi mathvariant="italic">i</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mi mathvariant="italic">n</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>,
            then the value computed from 
            <inlineequation><mml:math>
                <!-- eqn: i cdot DELTA u  +  u sub 1:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mi mathvariant="italic">i</mml:mi>
                        <mml:mo>&CenterDot;</mml:mo>
                        <mml:mrow>
                            <mml:mo>&Delta;</mml:mo>
                            <mml:mi mathvariant="italic">u</mml:mi>
                        </mml:mrow>
                    </mml:mrow>
                    <mml:mo>+</mml:mo>
                    <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                    <mml:mn>1</mml:mn>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            is exactly
            <inlineequation><mml:math>
                <!-- eqn: u sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">u</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>,
            and if 
            <inlineequation><mml:math>
                <!-- eqn: j = m:-->
                <mml:mrow>
                    <mml:mi mathvariant="italic">j</mml:mi>
                    <mml:mo>=</mml:mo>
                    <mml:mi mathvariant="italic">m</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>,
            then the value computed from
            <inlineequation><mml:math>
                <!-- eqn: j  cdot  DELTA v  +  v sub 1:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mi mathvariant="italic">j</mml:mi>
                        <mml:mo>&CenterDot;</mml:mo>
                        <mml:mrow>
                            <mml:mo>&Delta;</mml:mo>
                            <mml:mi mathvariant="italic">v</mml:mi>
                        </mml:mrow>
                    </mml:mrow>
                    <mml:mo>+</mml:mo>
                    <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                    <mml:mn>1</mml:mn>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            is exactly 
            <inlineequation><mml:math>
                <!-- eqn: v sub 2:-->
                <mml:msub><mml:mi mathvariant="italic">v</mml:mi>
                <mml:mn>2</mml:mn>
                </mml:msub>
            </mml:math></inlineequation>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <function>glEvalMesh</function>
            is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
            and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAP1_GRID_DOMAIN</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAP2_GRID_DOMAIN</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAP1_GRID_SEGMENTS</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAP2_GRID_SEGMENTS</constant>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glEvalCoord</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glEvalPoint</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glMapGrid</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>
