 to a plane perpendicular to its axis in a given direction, which is used when computing support points.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">dir</td><td>The direction of the plane. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The distance from the center of the <a class="el" href="classnetdem_1_1_ellipsoid.html" title="A class for representing an ellipsoid shape.">Ellipsoid</a> object to the plane. </dd><