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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>This is the base class of particle generator, which generates particles with given positions and volumes. The direct generator simply generate particle with given position and volume. </p>
<dl class="section author"><dt>Author</dt><dd>Luhui Han, Chi ZHang and Xiangyu Hu </dd></dl>
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