Hi,<br><br>&nbsp;&nbsp;&nbsp;&nbsp; I want to use vtkWorldPointPicker to get the 3D value while I'm using mouse left click! Who can tell me how to do that! By the way I won't&nbsp; to use 'P' key to indicate my pick operation.&nbsp; Also I'm confused that how can I give the intial first two values in the&nbsp; following&nbsp; Pick&nbsp; parameters, those are&nbsp; selectionPt[0] and selectionPt[1]. Any idea is appreciated! Thanks a lot! Giving some source code is appreciated.
<br><br><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="md" nowrap="nowrap" valign="top">int vtkWorldPointPicker::Pick           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap="nowrap" valign="top">double&nbsp;</td>
          <td class="mdname" nowrap="nowrap"> <em>selectionPt</em>[3], </td>
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          <td class="md" align="right" nowrap="nowrap"><br></td>
          <td class="md"><br></td>
          <td class="md" nowrap="nowrap"><a class="el" href="http://www.vtk.org/doc/release/5.0/html/a01970.html">vtkRenderer</a> *&nbsp;</td>
          <td class="mdname" nowrap="nowrap"> <em>renderer</em></td>
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          <td class="md"><br></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [inline]</code></td></tr></tbody></table><br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>