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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Will,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for responding to my thread, I have
waited days before somebody actually read my thread and reply me.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Yes, you are right that marching cubes
will always produce watertight surfaces, but what if the dataset is incomplete,
say dataset of a human hand that contain 10 slices,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And all these slices that feed
through marching cubes algorithms will created a water tight surface, what if
the last dataset is missing and a marching cubes is unable to enclose the
surfaces?? Is there any other ways to repair the geometry to enclose it??</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hong Wan</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Will Schroeder
[mailto:will.schroeder@kitware.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Monday,
November 11, 2002</span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>8:52 PM</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Hong Wan<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [vtkusers] Marching
Cubes Algorithms and Airtight Volume</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Marching cubes will ALWAYS produce watertight,
manifold surfaces. The only place there might be "holes" is on the
boundary where the surface exits the dataset. If there are holes then either a
boundary exists are something is going wrong with the segmentation process. If
the problem persists, create an example with a small dataset that demonstrates
the behavior.<br>
Will<br>
<br>
At </span></font>06:08 PM 11/11/2002 +0800, you wrote:<br>
<br>
<br>
</p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'>Hi <br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> <br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Can anyone suggest a step to create an airtight model from
marching cubes algorithms? I need to get rid of the big holes or small holes
presense in the model before exporting to stl format for rapid prototyping.<br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> <br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>For example, using Marching Cubes on bones of a human hand,
there are usually areas where segmentation based on thresholding does not do a
good job, instead of creating triangles, it creates holes with leave a gap in
the surface model of the human hand, I am thinking if there are any ways to
fill this gap?? To create a completely enclosed surface model?<br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> <br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Regards<br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'> <br>
</span></font><br>
<font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Hong Wan</span></font></p>
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