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<TITLE>bug in DeformableModelSimplexMesh ?</TITLE>
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<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">Dear All</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">We are working on a segmentation algorithm using deformable models with a refine mesh. The deformation and refinement is done in a for loop. Our application is based on the DeformableModel application as given in the InsightApplications example DeformableModelSimplexMesh.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">We modified the for loop in de DeformMesh method</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (DeformableModelApplication.cxx)</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> with a refinement of the mesh, but this crashes. Below a part of (pseudo) code is given.. </FONT></SPAN></P>
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<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
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<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="en-us"><FONT FACE="Calibri"> for i=</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="en-us"><FONT FACE="Calibri">1</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="en-us"><FONT FACE="Calibri">:i<nr_iterations;i++</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> {</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_simplexMesh->DisconnectPipeline()</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_deformFilter-SetInput(m_simplexMesh);</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_deformFilter->Update(0;</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> simplexMesh2 = m_deformFilter->GetOutput();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> </FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_refineMesh->SetInput(simplexMesh2);</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_refineMesh->Update();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> m_simplexMesh=m_refineMesh->GetOutput();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="en-us"><FONT FACE="Calibri"> }</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">m_deformFilter is a</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="nl-nl"> <FONT FACE="Calibri">DeformableSimplexMesh3DGradientConstraintForceFilter,</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="nl-nl"> </SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl-nl"><FONT FACE="Calibri">m_RefineMesh is a itkSimplexMeshAdaptTopologyFilter</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"> </SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="en-us"> </SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">To isolate the bug, we started with a little modification of the DeformMesh method in DeformableModelApplication.cxx. The modifications are given below (line 522 in original file, InsightApplciations 3.16). Running this code results also in a crash</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">*----------------------------------------------------------------------------------------------------------------------------------------</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New">SimplexMeshType::Pointer simplexMesh2 = m_SimplexMesh;</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">const</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"></FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">unsigned</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"></FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">int</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> numberOfIterationsToGo = atoi(m_IterationsValueInput->value()); </FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">for</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New">(</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">unsigned</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"></FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">int</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> i=0; i<numberOfIterationsToGo; i++ )</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New">{</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> std::cout <<</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#A31515" SIZE=1 FACE="Courier New">" Iteration "</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> << i << std::endl;</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> </FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT COLOR="#008000" SIZE=1 FACE="Courier New">//* -------------- start modified code -------------------------------------------</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> </SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#008000" SIZE=1 FACE="Courier New">// THIS IS MODIFIED CODE THAT (WE THINK) DOESN'T VIOLATE THE ITK RULES BUT THIS</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"></FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#008000" SIZE=1 FACE="Courier New">// CODE CRASHES</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_SimplexMesh->DisconnectPipeline();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_DeformFilter->SetInput(m_SimplexMesh);</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_DeformFilter->SetIterations(1);</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_DeformFilter->Update();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">simplexMesh2 = m_DeformFilter->GetOutput();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">SimplexMesh2->DisconnectPipeline(0</FONT></SPAN></I></P>
<UL DIR=LTR><UL DIR=LTR><UL DIR=LTR>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New">m_DeformFilter->SetInput(simplexMesh2);</FONT></SPAN></I></P>
</UL></UL></UL>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_DeformFilter->SetIterations(1);</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_DeformFilter->Update();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=1 FACE="Courier New">m_SimplexMesh = m_DeformFilter->GetOutput();</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT COLOR="#008000" SIZE=1 FACE="Courier New">// --------------------- end modified code -------------------------------------- */</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> m_SimplexMeshToShow = m_SimplexMesh;</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> </FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#0000FF" SIZE=1 FACE="Courier New">this</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New">->RefreshMeshVisualization();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> </FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> </FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT COLOR="#008000" SIZE=1 FACE="Courier New">// force a redraw</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> axialView->redraw();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> coronalView->redraw();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> sagittalView->redraw();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> surfaceView->redraw();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=1 FACE="Courier New"> Fl::check(); </FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New"> }</FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Times New Roman">*-------------------------------------------------------------------------------------------------------------------------------------------</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">Error message</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (using Visual Studio 2005 and/or 2008)</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> of the crash</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">Debug Assertion Failed !</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"> <FONT FACE="Calibri">Expression map/set iterator not dereferencable </FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Do we something wrong? Using a for loop in a pipeline is dangerous but in bug 0001080, we read it’s possible to use a for loop. Also at the Old Nabble forum I read a message that is must be possible to use a for loop. (</FONT></SPAN><SPAN LANG="nl"></SPAN><A HREF="http://old.nabble.com/Using-image-iterators-combined-with-filters-in-a-loop-td28684443.html"><SPAN LANG="nl"><U></U></SPAN><U><SPAN LANG="en-us"><FONT COLOR="#0000FF" FACE="Calibri">http://old.nabble.com/Using-image-iterators-combined-with-filters-in-a-loop-td28684443.html</FONT></SPAN></U><SPAN LANG="nl"></SPAN></A><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">)</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Even if we changed the code in the original example DeformableModelApplication according to the above referenced Old Nabble article the application crashes</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri"> (see below)</FONT></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New"> </FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New">m_DeformFilter->SetInput( m_SimplexMesh );</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New"> </FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT SIZE=2 FACE="Courier New">m_DeformFilter->SetIterations(1); </FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New"> m_DeformFilter->Update();</FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"><FONT SIZE=2 FACE="Courier New"> </FONT></SPAN></I><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><SPAN LANG="nl"><I></I></SPAN><I><SPAN LANG="nl-nl"> <FONT SIZE=2 FACE="Courier New">m_SimplexMesh = m_DeformFilter->GetOutput(); </FONT></SPAN></I></P>
<P DIR=LTR><I><SPAN LANG="nl-nl"> <FONT SIZE=2 FACE="Courier New">m_SimplexMesh->DisconnectPipeline();</FONT></SPAN></I></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">So is there a bug in the original ITK sources? As far as we now, ITK doesn’t allow to change the input of a filter and we think this is what happened in the original DeformableSimplexMesh application.</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calibri">Can someone help us with our problem ?</FONT></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"></SPAN></P>
<P DIR=LTR><SPAN LANG="nl"></SPAN><SPAN LANG="en-us"><FONT FACE="Calibri">We tested with ITK 2.8, ITK 3.16 and 3.18 and all crashes</FONT></SPAN></P>
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