y to this point return 1: don't clip the ray and continue </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">fixture</td><td>the fixture hit by the ray </td></tr>
    <tr><td class="paramname">point</td><td>the point of initial intersection </td></tr>
    <tr><td class="paramname">normal</td><td>the normal vector at the point of intersection </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 to terminate, fraction to clip 