<td></td>
          <td class="paramtype">T const &amp;&#160;</td>
          <td class="paramname"><em>epsilon</em>&#160;</td>
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          <td></td>
          <td>)</td>
          <td></td><td></td>
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<p>Check whether a vector is null. </p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="a00235.html" title="Include <glm/gtx/vector_query.hpp> to use the features of this extension. ">GLM_GTX_vector_query</a> exten