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<refentry xml:id="function.swf-perspective" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>swf_perspective</refname>
  <refpurpose>Define a perspective projection transformation</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <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>
   Defines a perspective projection transformation. 
  </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>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>fovy</parameter></term>
     <listitem>
      <para>
       A field-of-view angle in the y direction.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>aspect</parameter></term>
     <listitem>
      <para>
       The aspect ratio of the viewport that is being drawn onto.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>near</parameter></term>
     <listitem>
      <para>
       The near clipping plane.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>far</parameter></term>
     <listitem>
      <para>
       The far clipping plane.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>
</refentry>

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