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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Chen;<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Check out this tutorial : <a
href="http://devsample.org/index.php?option=com_content&task=view&id=48&Itemid=27">http://devsample.org/index.php?option=com_content&task=view&id=48&Itemid=27</a>
it is for getting the scalar value of a clicked point in 2d projection but you
must do the similar thing for getting the id of a clicked point in 3d scene…After
getting the point id you can calculate the structured position of this point using
dimensions of imagedata… For computing the distance of points check out
the vtkMath class <a
href="http://www.vtk.org/doc/nightly/html/classvtkMath.html#2ae99578ae65acefe517b12a7f4068e1">http://www.vtk.org/doc/nightly/html/classvtkMath.html#2ae99578ae65acefe517b12a7f4068e1</a>
or simply write <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>dx = Ax-Bx <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>dy = Ay-By <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>dz = Az-Bz <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>distance = sqrt(dx*dx + dy*dy + dz*dz)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yours sincerely…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Sercani…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> vtkusers-bounces@vtk.org
[mailto:vtkusers-bounces@vtk.org] <b>On Behalf Of </b>Dongqing Chen<br>
<b>Sent:</b> Friday, January 30, 2009 8:37 PM<br>
<b>To:</b> vtkusers@vtk.org<br>
<b>Subject:</b> [vtkusers] how to compute the distance between two 3D points.<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Dear
All:</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
I have two small questions, and want to ask for any suggestion from this mail
list. </span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
I could display the 3D model (surface rendering), and I may figure out its 2D
axial/sagittal/coronal projections, then </span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>1).
how could I find the corresponding 2D points on these three projects for a
given 3D point, say, if I have a 3D point on the 3D model, which VTK
class I should use to find its projection pionts on 2D axial, sagittal and
coronal?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> 2). How
could I measure or compute the distance between any 3D points, say,
which VTK class allows me to know its 3D position if I click on a 3D
point?</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best
Wishes,<br>
-----------------------------------------------------------------------------<br>
Dongqing Chen, Ph.D.<br>
Computer Vision & Image Processing (CVIP) Lab<br>
Department of Electrical & Computer Engineering<br>
Speed School of Engineering<br>
University of Louisville<br>
Louisville, KY, 40292<br>
U.S.A<br>
email: <a href="mailto:dqchen@cvip.louisville.edu">dqchen@cvip.louisville.edu</a><br>
phone: 1-502-852-2789 (Lab)<br>
1-502-852-6130 (Office)<br>
----------------------------------------------------------------------------</span><o:p></o:p></p>
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