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<p class="MsoNormal">You can use the joint smoothing method implemented in 3D Slicer to make independent meshes smoother while keeping their interface airtight. The key idea is to create a merged polydata, smooth it, and split it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sample images:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo4">Before:
<a href="https://www.dropbox.com/s/819nenm7kpb09tz/1-before-joint-smoothing.png?dl=0">
https://www.dropbox.com/s/819nenm7kpb09tz/1-before-joint-smoothing.png?dl=0</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo4">After:
<a href="https://www.dropbox.com/s/7o0ijjk1kfz7ha2/2-after-joint-smoothing.png?dl=0">
https://www.dropbox.com/s/7o0ijjk1kfz7ha2/2-after-joint-smoothing.png?dl=0</a><o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You can try it by downloading&installing 3D Slicer and following these steps:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo3">go to Segment Editor module<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">draw a few segments<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">click Show 3D to see segments as surface meshes in 3D<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">select Smoothing effect, Joint smoothing method, and click Apply<o:p></o:p></li></ul>
<p class="MsoNormal"><a name="_MailEndCompose"><o:p> </o:p></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose">Source code:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span style="font-size:9.0pt;font-family:Consolas;color:#24292E">https://github.com/Slicer/Slicer/blob/1b713d1701dea926134ec6366134fa3e08caf21e/Modules/Loadable/Segmentations/EditorEffects/Python/SegmentEditorSmoothingEffect.py#L262-L351<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose">Andras<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><o:p> </o:p></span></p>
<span style="mso-bookmark:_MailEndCompose"></span>
<p class="MsoNormal"><b>From:</b> vtkusers [mailto:vtkusers-bounces@vtk.org] <b>On Behalf Of
</b>Henan Zhao<br>
<b>Sent:</b> Friday, December 15, 2017 10:57 PM<br>
<b>To:</b> Bill Lorensen <bill.lorensen@gmail.com><br>
<b>Cc:</b> VTK Users <vtkusers@vtk.org><br>
<b>Subject:</b> Re: [vtkusers] Smoothing Surface<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks! <o:p></o:p></p>
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<p class="MsoNormal">I have one more question about smoothing a surface.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If a surface is made up by two shapes, like a semi-sphere and a plane. <o:p></o:p></p>
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<p class="MsoNormal">Is there a good way to smooth the original connectivity between the two shapes in VTK?<o:p></o:p></p>
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<p class="MsoNormal">For example, assuming that I locate a semi-sphere on the top of a plane, I expect that the angle on the connectivity part is 90 degree.<o:p></o:p></p>
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<p class="MsoNormal">However, the connectivity part is also smoothed and the angle is larger than 90 degree after I use the smoothing algorithm.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Dec 15, 2017 at 5:57 PM, Bill Lorensen <<a href="mailto:bill.lorensen@gmail.com" target="_blank">bill.lorensen@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Try this:<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Florensen.github.io%2FVTKExamples%2Fsite%2FCxx%2FMeshes%2FWindowedSincPolyDataFilter%2F&data=02%7C01%7Classo%40queensu.ca%7Cae6e57d7c92447bc7d9108d54439083b%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636489934105797878&sdata=6T8MC0OcDmSQYSSdvLiLdOJoRK1P7O6fRkb0vcp8qP0%3D&reserved=0" target="_blank">https://lorensen.github.io/VTKExamples/site/Cxx/Meshes/WindowedSincPolyDataFilter/</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Dec 15, 2017 at 4:40 PM, Henan Zhao <<a href="mailto:henan1@umbc.edu" target="_blank">henan1@umbc.edu</a>> wrote:<o:p></o:p></p>
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<p style="margin-top:0cm;line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">Hi,<o:p></o:p></span></p>
<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">I met a problem when using vtkSmoothPolyDataFilter.<br>
I want to use this filter to smooth a mesh, and I want to have a new mesh which is outside the original one.<o:p></o:p></span></p>
<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">However, the new mesh I got is inside the original one.<br>
Here is a figure: the white wireframe is my original mesh, and the white solid surface is the new one using vtkSmoothPolyDataFilter.<o:p></o:p></span></p>
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<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><img border="0" width="471" height="281" style="width:4.901in;height:2.927in" id="Picture_x0020_1" src="cid:image001.jpg@01D3760C.0C742620" alt="Inline image 1"></span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><o:p> </o:p></span></p>
<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">I am wondering if there is a parameter I should set or any other filters I should use.<o:p></o:p></span></p>
<p style="line-height:14.25pt"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">Thank you in advance.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:#888888"><br>
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<span class="hoenzb"><o:p></o:p></span></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="hoenzb"><span style="color:#888888">-- </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#888888">Unpaid intern in BillsBasement at noware dot com</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Henan Zhao<o:p></o:p></p>
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<p class="MsoNormal">Website: <a href="https://na01.safelinks.protection.outlook.com/?url=http:%2F%2Fwww.csee.umbc.edu%2F~henan1%2F&data=02%7C01%7Classo%40queensu.ca%7Cae6e57d7c92447bc7d9108d54439083b%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636489934105797878&sdata=E4MyCK5cJY4zgbyX%2B6nfRgi4wDFDzyPK3LzOAtDGuyI%3D&reserved=0" target="_blank">
http://www.csee.umbc.edu/~henan1/</a><o:p></o:p></p>
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<p class="MsoNormal">Graduate student, Dept. of Computer Science and Electrical Engineering,
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<p class="MsoNormal">University of Maryland, Baltimore County<o:p></o:p></p>
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