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<p>Return the box depth. </p>
<dl class="section warning"><dt>Warning</dt><dd>The depth is computed differently depending on whether <code>T</code> is of floating point or integral type.<ul>
<li>If <code>T</code> is floating point, the method returns <code>maxZ - minZ</code>.</li>
<li>If <code>T</code> is integral, the method returns <code>maxZ - minZ + 1</code> (number of ve