r>
<td width="20px"></td><td><code><span class="label">p_nY</span>:Number</code> &mdash;  y coordinate of the vertex
   </td>
</tr>
<tr>
<td class="paramSpacer">&nbsp;</td>
</tr>
<tr>
<td width="20px"></td><td><code><span class="label">p_nZ</span>:Number</code> &mdash;  z coordinate of the vertex
   </td>
</tr>
</table>
<p></p>
<span class="label">Returns</span>
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="20"></td><td><code>int</code> &mdash;   The next free index or -1 it the index i