<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> <refentry id="glFogCoord"> <refmeta> <refmetainfo> <copyright> <year>1991-2006</year> <holder>Silicon Graphics, Inc.</holder> </copyright> </refmetainfo> <refentrytitle>glFogCoord</refentrytitle> <manvolnum>3G</manvolnum> </refmeta> <refnamediv> <refname>glFogCoord</refname> <refpurpose>set the current fog coordinates</refpurpose> </refnamediv> <refsynopsisdiv><title>C Specification</title> <funcsynopsis> <funcprototype> <funcdef>void <function>glFogCoordd</function></funcdef> <paramdef>GLdouble <parameter>coord</parameter></paramdef> </funcprototype> </funcsynopsis> <funcsynopsis> <funcprototype> <funcdef>void <function>glFogCoordf</function></funcdef> <paramdef>GLfloat <parameter>coord</parameter></paramdef> </funcprototype> </funcsynopsis> </refsynopsisdiv> <refsect1 id="parameters"><title>Parameters</title> <variablelist> <varlistentry> <term><parameter>coord</parameter></term> <listitem> <para> Specify the fog distance. </para> </listitem> </varlistentry> </variablelist> </refsect1> <refsynopsisdiv><title>C Specification</title> <funcsynopsis> <funcprototype> <funcdef>void <function>glFogCoorddv</function></funcdef> <paramdef>GLdouble * <parameter>coord</parameter></paramdef> </funcprototype> </funcsynopsis> <funcsynopsis> <funcprototype> <funcdef>void <function>glFogCoordfv</function></funcdef> <paramdef>GLfloat * <parameter>coord</parameter></paramdef> </funcprototype> </funcsynopsis> </refsynopsisdiv> <refsect1 id="parameters2"><title>Parameters</title> <variablelist> <varlistentry> <term><parameter>coord</parameter></term> <listitem> <para> Specifies a pointer to an array containing a single value representing the fog distance. </para> </listitem> </varlistentry> </variablelist> </refsect1> <refsect1 id="description"><title>Description</title> <para> <function>glFogCoord</function> specifies the fog coordinate that is associated with each vertex and the current raster position. The value specified is interpolated and used in computing the fog color (see <citerefentry><refentrytitle>glFog</refentrytitle></citerefentry>). </para> </refsect1> <refsect1 id="notes"><title>Notes</title> <para> <function>glFogCoord</function> is available only if the GL version is 1.4 or greater. </para> <para> The current fog coordinate can be updated at any time. In particular, <function>glFogCoord</function> can be called between a call to <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding call to <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. </para> </refsect1> <refsect1 id="associatedgets"><title>Associated Gets</title> <para> <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_FOG_COORD</constant> </para> </refsect1> <refsect1 id="seealso"><title>See Also</title> <para> <citerefentry><refentrytitle>glFog</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glVertex</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>