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  <refentry id="function.swf-perspective">
   <refnamediv>
    <refname>swf_perspective</refname>
    <refpurpose>
     Define a perspective projection transformation
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>void</type><methodname>swf_perspective</methodname>
      <methodparam><type>float</type><parameter>fovy</parameter></methodparam>
      <methodparam><type>float</type><parameter>aspect</parameter></methodparam>
      <methodparam><type>float</type><parameter>near</parameter></methodparam>
      <methodparam><type>float</type><parameter>far</parameter></methodparam>
     </methodsynopsis>
    <para>
     The <function>swf_perspective</function> function defines a
     perspective projection transformation.  The
     <parameter>fovy</parameter> parameter is field-of-view angle in
     the y direction.  The <parameter>aspect</parameter> parameter
     should be set to the aspect ratio of the viewport that is being
     drawn onto.  The <parameter>near</parameter> parameter is the
     near clipping plane and the <parameter>far</parameter> parameter
     is the far clipping plane.
    </para>
    <note>
     <para>
      Various distortion artifacts may appear when performing a
      perspective projection, this is because Flash players only have
      a two dimensional matrix.  Some are not to pretty.
     </para>
    </note>
   </refsect1>
  </refentry>

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