<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:10pt">Thank you Bill for your answer.<br><br>The input vtkImageData is the result of a segmentation process. Sometimes, the segmentation is not perfect, part of the object can be missing on a slice. For now, I can't know automatically if a slice is missing or not before the 3D build. Thus, I can't create it manually. I thought Marching cubes was able to deal with this kind of problem, apparently not.<br><br>I will look at your solution and let you know.<br><br>In any case, the resampler solution works, it is just not really suitable for bad resolution.<br><br>Best.<br><br><div style="font-family: Courier New, courier, monaco, monospace, sans-serif; font-size: 10pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <font face="Arial" size="2"> <hr size="1"> <b><span
style="font-weight:bold;">De :</span></b> Bill Lorensen <bill.lorensen@gmail.com><br> <b><span style="font-weight: bold;">À :</span></b> Malsoaz James <jmalsoaz@yahoo.fr> <br><b><span style="font-weight: bold;">Cc :</span></b> "vtkusers@vtk.org" <vtkusers@vtk.org> <br> <b><span style="font-weight: bold;">Envoyé le :</span></b> Mardi 6 Décembre 2011 18h19<br> <b><span style="font-weight: bold;">Objet :</span></b> Re: [vtkusers] Build 3D Mesh from vtkImageData using vtkMarchingCubes - holes filling ?<br> </font> <br>Another possible solution is to convert your image data to a<br>rectilinear grid. The rectilinear grid supports non uniform spacing.<br>Once converted you would use vtkContourFilter rather than Marching<br>Cubes. It will be slower.<br><br>Bill<br><br>On Tue, Dec 6, 2011 at 12:16 PM, Bill Lorensen <<a ymailto="mailto:bill.lorensen@gmail.com"
href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>> wrote:<br>> Marching Cubes is the correct filter and your results look good<br>> (except for the missing slice. You could try to create a missing slice<br>> by creating a new slice. Maybe by averaging the slice above and below<br>> the missing slice.<br>><br>> Why is the data missing?<br>><br>> On Tue, Dec 6, 2011 at 12:03 PM, Malsoaz James <<a ymailto="mailto:jmalsoaz@yahoo.fr" href="mailto:jmalsoaz@yahoo.fr">jmalsoaz@yahoo.fr</a>> wrote:<br>>> Dear VTK users<br>>><br>>> I'm trying to build a 3D mesh from a vtkImageData using vtkMarchingCubes.<br>>> The vtkImageData is build from a list of 2D binary slices.<br>>><br>>> vtkMarchingCubes works great. But when a slice(s) is(are) missing, it<br>>> creates a hole in the 3D mesh (see image in attachment).<br>>><br>>> 1 - How can I fill this kind of hole ?
Ideally, I would like to link the two<br>>> parts of the mesh<br>>><br>>> 2 - I found a solution in the use of a resampler (vtkImageResample,<br>>> vtkImageShrink3D, don't know which one is recommanded). Unfortunately, it<br>>> sometimes produces ugly mesh with "stair effect" when the spacing is too big<br>>> (still there after decimate and smooth). Is it a good solution ? How to<br>>> solve the stair problem ?<br>>><br>>> 3 - Browsing the mailing list brings me to the notion of "repair hole" for<br>>> marching cubes. I don't know a lot about it. But should I look into this ?<br>>> Some solutions exist for this such as <a href="http://www.opentopology.org/" target="_blank">http://www.opentopology.org/</a><br>>><br>>> 4 - Is vtkMarchingCubes the class I should use for my purpose or should I<br>>> look at vtkVoxelContoursSurfaceFilter or any other filter
?<br>>><br>>><br>>> Thank you for you help.<br>>> Best.<br>>><br>>><br>>><br>>><br>>> _______________________________________________<br>>> Powered by www.kitware.com<br>>><br>>> Visit other Kitware open-source projects at<br>>> <a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>>><br>>> Please keep messages on-topic and check the VTK FAQ at:<br>>> <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a><br>>><br>>> Follow this link to subscribe/unsubscribe:<br>>> <a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a><br>>><br>><br>><br>><br>> --<br>> Unpaid intern in BillsBasement at noware dot com<br><br><br><br>-- <br>Unpaid intern in
BillsBasement at noware dot com<br><br><br> </div> </div> </div></body></html>