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Thanks for the quick reply Bill,<br>
if I get your point right, your saying that because of the different
coordinate system the y-axis is flipped, so for my imagination my
model would be upside down. But that should not bring up any
computational issues, should it?<br>
<br>
I tried a simple RegularSphere in itk (RegularSphereMeshSource) as
initial mesh for the segmentation process. Same problem.<br>
I debugged the code as far as possible and it came up that the
process crashes in the function "ComputeDt()" in the
DeformableMesh3DFilter class line 331.<br>
<br>
The Array "m_K" is not filled properly with the stiffness parameters
which should be done in the function "SetMeshStiffness()" in the
same class. This function skips the while loop (see below) in line
288 which probably causes the process to crash:<br>
<br>
while (celldata != myCellData->End())<br>
{<br>
const double x = celldata.Value();<br>
m_K[j] = m_StiffnessMatrix+((int) x);<br>
++celldata; <br>
j++;<br>
}<br>
<br>
Hope that helps for further assistance.<br>
<br>
Thanks very much<br>
<br>
Cheers<br>
Sven<br>
<br>
<br>
<br>
<div class="moz-signature"><b><font color="#ff6600" face="Arial"><span
style="font-family: Arial; color: rgb(255, 102, 0);
font-weight: bold;">Fachhochschule Dortmund</span></font></b>
<br>
<b><font face="Arial" size="1"><span style="font-size: 7.5pt;
font-family: Arial; font-weight: bold;">University of
Applied Sciences and Arts</span></font></b> <br>
<font style="color: rgb(169, 166, 166);" face="MetaKorrespondenz"
size="1"><span style="font-size: 9pt; font-family:
MetaKorrespondenz;"><br>
Sven Olaf Lüttmann<br>
B.Sc. Medizinische Informatik<br>
<br>
FB Informatik, Medizinische Informatik<br>
Emil-Figge-Str. 42<br>
44227 Dortmund<br>
<br>
Raum: EFS 42 B.1.21<br>
<br>
Fax: 0231 / 755-6725<br>
E-Mail: <a href="mailto:sven.luettmann@fh-dortmund.de">sven.luettmann@fh-dortmund.de</a><br>
Web: <a href="http://www.fh-dortmund.de">http://www.fh-dortmund.de</a></span></font><br>
</div>
<br>
On 13.10.2011 13:59, Bill Lorensen wrote:
<blockquote
cite="mid:CADZJ4hOL8O8sUHdDC1+Rvkg1h7gZvovnLXhO77dZjAYO-GxsHw@mail.gmail.com"
type="cite">ITK and VTK have different coordinate systems. The VTK
y-axis is flipped. Perhaps this is causing issues.<br>
<br>
<div class="gmail_quote">On Thu, Oct 13, 2011 at 7:34 AM, Sven
Olaf Lüttmann <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:sven.luettmann@fh-dortmund.de">sven.luettmann@fh-dortmund.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
<p style="margin-bottom: 0cm;" lang="en-US">Dear ITK-Users,</p>
<p style="margin-bottom: 0cm;" lang="en-US">I'm experiencing
problems implementing a deformable segmentation approach.
I'm using the itkDeformableMesh3DFilter.</p>
<p style="margin-bottom: 0cm;" lang="en-US"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-US">Here is what I
do specifically:</p>
<ol>
<li>
<p style="margin-bottom: 0cm;" lang="en-US">Let the user
draw contours with vtkContourWidget</p>
</li>
<li>
<p style="margin-bottom: 0cm;" lang="en-US">Connect
these contours to form a model as vtkPolyData</p>
</li>
<li>
<p style="margin-bottom: 0cm;" lang="en-US">Convert the
vtkPolyData to itk::Mesh using the code mentioned in
the Auxiliary folder in the InsightApplications
(vtkPolyDataToITKMesh.cxx)</p>
</li>
<li>
<p style="margin-bottom: 0cm;" lang="en-US">Use that
mesh as initial mesh for the segmentation process</p>
</li>
</ol>
<p style="margin-bottom: 0cm;" lang="en-US"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-US">The problem is
when I use my generated mesh the segmentation process
crashes. When I use exactly the same code as in the
example, means using the BinaryMask3DMeshSource Filter to
create the mesh, everything works fine.</p>
<p style="margin-bottom: 0cm;" lang="en-US"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-US">Are there any
known issues converting vtkPolyData into itk::mesh.</p>
<p style="margin-bottom: 0cm;" lang="en-US"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-US">Thanks in
advance</p>
<p style="margin-bottom: 0cm;" lang="en-US">Best regards</p>
<p style="margin-bottom: 0cm;" lang="en-US"> Sven
Lüttmann<br>
</p>
<p style="margin-bottom: 0cm;" lang="en-US"><br>
</p>
<div>-- <br>
<b><font color="#ff6600" face="Arial"><span
style="font-family: Arial; color: rgb(255, 102, 0);
font-weight: bold;">Fachhochschule Dortmund</span></font></b>
<br>
<b><font face="Arial" size="1"><span style="font-size:
7.5pt; font-family: Arial; font-weight: bold;">University
of Applied Sciences and Arts</span></font></b> <br>
<font style="color: rgb(169, 166, 166);"
face="MetaKorrespondenz" size="1"><span
style="font-size: 9pt; font-family:
MetaKorrespondenz;"><br>
Sven Olaf Lüttmann<br>
B.Sc. Medizinische Informatik<br>
<br>
FB Informatik, Medizinische Informatik<br>
Emil-Figge-Str. 42<br>
44227 Dortmund<br>
<br>
Raum: EFS 42 B.1.21<br>
<br>
Fax: 0231 / 755-6725<br>
E-Mail: <a moz-do-not-send="true"
href="mailto:sven.luettmann@fh-dortmund.de"
target="_blank">sven.luettmann@fh-dortmund.de</a><br>
Web: <a moz-do-not-send="true"
href="http://www.fh-dortmund.de" target="_blank">http://www.fh-dortmund.de</a></span></font><br>
</div>
</div>
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