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<p class=MsoNormal>Hi<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I want to create a simplex mesh from binary image (segmented
volume) , with predefined resolution (e.g. if a voxel is 1x1x1 mm create a mesh
with 5mm spacing between vertices)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve used <span style='font-size:10.0pt;font-family:
"Courier New"'>BinaryMask3DMeshSource </span>to create a mesh and VTK to reduce
the number of vertices. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I used the following code to do so :<o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itk::DefaultStaticMeshTraits< <span
style='color:blue'>double</span>, 3, 3, <span style='color:blue'>double</span>,<span
style='color:blue'>double</span> > TriangleMeshTraits;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itk::DefaultStaticMeshTraits< <span
style='color:blue'>double</span>, 3, 3, <span style='color:blue'>double</span>,<span
style='color:blue'>double</span> > SimplexMeshTraits;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itk::Mesh< <span style='color:blue'>double</span>,
3, TriangleMeshTraits > TriangleMeshType;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itk::SimplexMesh< <span style='color:blue'>double</span>,
3, SimplexMeshTraits > SimplexMeshType;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// Transform the triangle mesh to vtk mesh <o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itkMeshTovtkPolyData< TriangleMeshType TriangleMeshToPolyDataType;<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> TriangleMeshToPolyDataType
*meshToPolyData = <span style='color:blue'>new</span>
TriangleMeshToPolyDataType();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> meshToPolyData->SetInput(
INPUT_MESH );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// reduce vertices to 10% <o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> vtkDecimatePro
*decimator = vtkDecimatePro::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->SetInput(
meshToPolyData->GetOutput() );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->SetTargetReduction(
<span style='color:blue'>0.1</span> );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->PreserveTopologyOff();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->SplittingOn();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->BoundaryVertexDeletionOn();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->SetMaximumError(
VTK_DOUBLE_MAX );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> decimator->Update();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> vtkPolyDataToitkMesh< TriangleMeshType
> PolyDataToTriangleMeshType;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> PolyDataToTriangleMeshType
*polyDataToMesh = <span style='color:blue'>new</span>
PolyDataToTriangleMeshType();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> polyDataToMesh->SetInput(
decimator->GetOutput() );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:green'>// Transform the triangle mesh to simplex mesh <o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>typedef</span> itk::TriangleMeshToSimplexMeshFilter<
TriangleMeshType, SimplexMeshType > TriangleToSimplexMeshType;<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> TriangleToSimplexMeshType::Pointer
triangleToSimplex = TriangleToSimplexMeshType::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> triangleToSimplex->SetInput(
polyDataToMesh->GetOutput() );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> triangleToSimplex->Update();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New"'> <span
style='color:blue'>this</span>->m_pMesh = triangleToSimplex->GetOutput();<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>here are my questions <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]><span dir=LTR></span>usually there are more than 10% of
the vertices – how can I have less than 10% when I set it in the
decimator ?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]><span dir=LTR></span>I cannot set the spacing –
need to be guessed from the data (in the above example I want 1/5*1/5*1/5 =
0.008, which is too low for the decimator is there a method to do so ?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]><span dir=LTR></span>is there a process (maybe through
VTK) that creates a mesh with the desired resolution (e.g. if a voxel is 1x1x1
mm create a mesh with 5mm spacing between vertices)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Ori Hay<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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