;            <span class="keywordflow">return</span> QVector::Zero();</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;        <span class="keywordtype">float</span> lsqrt=LengthSquared();</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;        <span class="keywordflow">if</span>(lsqrt==0)</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;            <span class="keywordflow">return</span> QVector::Zero(