ass="params">
    <tr><td class="paramname">obj</td><td>Specify the object coordinates. </td></tr>
    <tr><td class="paramname">model</td><td>Specifies the current modelview matrix </td></tr>
    <tr><td class="paramname">proj</td><td>Specifies the current projection matrix </td></tr>
    <tr><td class="paramname">viewport</td><td>Specifies the current viewport </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Return the computed window coordinates. </dd></dl>
<dl 