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  <refentry id="function.swf-lookat">
   <refnamediv>
    <refname>swf_lookat</refname>
    <refpurpose>Define a viewing transformation</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>void</type><methodname>swf_lookat</methodname>
      <methodparam><type>float</type><parameter>view_x</parameter></methodparam>
      <methodparam><type>float</type><parameter>view_y</parameter></methodparam>
      <methodparam><type>float</type><parameter>view_z</parameter></methodparam>
      <methodparam><type>float</type><parameter>reference_x</parameter></methodparam>
      <methodparam><type>float</type><parameter>reference_y</parameter></methodparam>
      <methodparam><type>float</type><parameter>reference_z</parameter></methodparam>
      <methodparam><type>float</type><parameter>twist</parameter></methodparam>
     </methodsynopsis>
    <para>
     The <function>swf_lookat</function> function defines a viewing
     transformation by giving the viewing position (the parameters
     <parameter>view_x</parameter>, <parameter>view_y</parameter>, and
     <parameter>view_z</parameter>) and the coordinates of a reference
     point in the scene, the reference point is defined by the
     <parameter>reference_x</parameter>, <parameter>reference_y
     </parameter>, and <parameter>reference_z</parameter> parameters.
     The <parameter>twist </parameter> controls the rotation along
     with viewer's z axis.
    </para>
   </refsect1>
  </refentry>

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