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<p style="margin-top:0;margin-bottom:0">Hi Vinvent,</p>
<p style="margin-top:0;margin-bottom:0">Thanks for you reply.</p>
I applied the vtkCurvature on my data.
<div>Then i extracted those areas by using vtkthreshold with ThresholdByLower.</div>
<div>The following is my code. Could you please advice?</div>
<div>
<div><br>
</div>
<div>.......</div>
<div><span style="white-space:pre"></span>vtkPolyDataReader *reader = vtkPolyDataReader::New();</div>
<div><span style="white-space:pre"></span>reader->SetFileName(argv[1]);</div>
<div><span style="white-space:pre"></span>reader->Update();</div>
<div><br>
</div>
<div><span style="white-space:pre"></span>int nOfPnts = reader->GetOutput()->GetPoints()->GetNumberOfPoints();</div>
<div><br>
</div>
<div><span style="white-space:pre"></span>vtkCurvatures *meanCurve = vtkCurvatures::New();</div>
<div><span style="white-space:pre"></span>meanCurve->SetInputConnection(reader->GetOutputPort());</div>
<div><span style="white-space:pre"></span>meanCurve->SetCurvatureTypeToMean();</div>
<div><span style="white-space:pre"></span>meanCurve->Update();<span style="font-size: 12pt; white-space: pre;">
</span></div>
<div><span style="white-space:pre"></span></div>
<div><span style="white-space:pre"></span>vtkThreshold *thresh = vtkThreshold::New();</div>
<div><span style="white-space:pre"></span>thresh->SetInputConnection(meanCurve->GetOutputPort());</div>
<div><span style="white-space:pre"></span>thresh->ThresholdByLower(0.085);</div>
<div><span style="white-space:pre"></span>thresh->Update();</div>
<div><br>
</div>
<div><span style="white-space:pre"></span>vtkGeometryFilter *geom = vtkGeometryFilter::New();</div>
<div><span style="white-space:pre"></span>geom->SetInputConnection(thresh->GetOutputPort());</div>
<div><br>
</div>
<div><span style="white-space:pre"></span>vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();</div>
<div><span style="white-space:pre"></span>mapper->SetInputConnection(geom->GetOutputPort());</div>
........</div>
<div><br>
</div>
<div>Thank you.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Polly<br>
<div style="color: rgb(0, 0, 0);">
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Vincent RIVOLA <vincentrivola@hotmail.com><br>
<b>Sent:</b> Saturday, March 3, 2018 4:11 AM<br>
<b>To:</b> Polly Pui<br>
<b>Cc:</b> Cory Quammen; vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] vtkBooleanOperationPolyDataFilter</font>
<div> </div>
</div>
<div class="" style="word-wrap:break-word; line-break:after-white-space">Hi,
<div class=""><br class="">
</div>
<div class="">Do you apply vtkThreshold on cell values or point values?</div>
<div class="">This will make a difference and I guess the missing cells is related to that. </div>
<div class="">If you really want to get the complementary part you should apply TheresoldByLower and ThresholdByUpper on cell data I think.</div>
<div class=""><br class="">
</div>
<div class="">Regards,</div>
<div class=""><br class="">
</div>
<div class="">Vincent<br class="">
<div class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">Le 2 mars 2018 à 19:39, Polly Pui <<a href="mailto:polly_sukting@hotmail.com" class="" id="LPlnk869111" previewremoved="true">polly_sukting@hotmail.com</a>> a écrit :</div>
<br class="x_Apple-interchange-newline">
<div class="">
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<div class="" style="margin-top:0px; margin-bottom:0px">Hi Cory,</div>
<div class="" style="margin-top:0px; margin-bottom:0px">Thanks for your reply.</div>
<div class="" style="margin-top:0px; margin-bottom:0px">I extracted the result in red image by using the vtkthreshold (ThresholdByLower=0.085). </div>
<div class="" style="margin-top:0px; margin-bottom:0px">I tried to invert the extraction by using ThresholdByUpper=0.015, but the result weren't what i wanted.</div>
<div class="" style="margin-top:0px; margin-bottom:0px">The red image with white holes (the removed areas are what i wanted). The blue area is extracted using the inverted value of threshold.</div>
<div class="" style="margin-top:0px; margin-bottom:0px"><span id="x_cid:f7c26712-986e-4e9b-9c1f-0174777617ab"><above_below.jpg></span><br class="">
I cant really understand what do you mean by boolean operations cant work on this case.</div>
<div class="" style="margin-top:0px; margin-bottom:0px">Are we not able to obtain the areas using "difference" operation?</div>
<br class="">
Best,
<div class="">Polly<br class="">
<div class="" style="">
<hr tabindex="-1" class="" style="display:inline-block; width:758.515625px">
<div id="x_divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" class="" style="font-size:11pt"><b class="">From:</b><span class="x_Apple-converted-space"> </span>Cory Quammen <<a href="mailto:cory.quammen@kitware.com" class="" id="LPlnk533677" previewremoved="true">cory.quammen@kitware.com</a>><br class="">
<b class="">Sent:</b><span class="x_Apple-converted-space"> </span>Thursday, March 1, 2018 9:01 PM<br class="">
<b class="">To:</b><span class="x_Apple-converted-space"> </span>Polly Pui<br class="">
<b class="">Cc:</b><span class="x_Apple-converted-space"> </span><a href="mailto:vtkusers@vtk.org" class="" id="LPlnk402404" previewremoved="true">vtkusers@vtk.org</a><br class="">
<b class="">Subject:</b><span class="x_Apple-converted-space"> </span>Re: [vtkusers] vtkBooleanOperationPolyDataFilter</font>
<div class=""> </div>
</div>
<div class="">
<div dir="ltr" class=""><br class="">
<div class="x_x_gmail_extra"><br class="">
<div class="x_x_gmail_quote">On Thu, Mar 1, 2018 at 1:01 AM, Polly Pui<span class="x_Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:polly_sukting@hotmail.com" target="_blank" id="LPlnk550297" class="" previewremoved="true">polly_sukting@hotmail.com</a>></span><span class="x_Apple-converted-space"> </span>wrote:<br class="">
<blockquote class="x_x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-style:solid; border-left-color:rgb(204,204,204); padding-left:1ex">
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<p class="" style="margin-top:0px; margin-bottom:0px"></p>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
Hi,</div>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
I would like to obtain the areas which are removed in 'Red Image'.</div>
</div>
</div>
</blockquote>
<div class="">Couldn't you invert the threshold operation to produce those areas instead of the red surface?<br class="">
</div>
<blockquote class="x_x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-style:solid; border-left-color:rgb(204,204,204); padding-left:1ex">
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<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
Green image is original data and Red image is the thresholded data. </div>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
I applied "union operation" in order to get the areas. I used the code given in <a href="https://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/BooleanOperationPolyDataFilter" class="x_x_m_1743815686831938821OWAAutoLink" id="LPlnk421431" target="_blank" previewremoved="true">https://www.vtk.org/Wiki/<wbr class="">VTK/Examples/Cxx/PolyData/<wbr class="">BooleanOperationPolyDataFilter</a></div>
<br class="">
</div>
</div>
</blockquote>
<div class="">The boolean operation filter won't work in this case because it does not handle boolean operations on overlapping surfaces.</div>
<div class=""><br class="">
</div>
<div class="">HTH,</div>
<div class="">Cory</div>
<blockquote class="x_x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left-width:1px; border-left-style:solid; border-left-color:rgb(204,204,204); padding-left:1ex">
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<div id="x_x_m_1743815686831938821divtagdefaultwrapper" dir="ltr" class="" style="font-size:12pt; font-family:Calibri,Helvetica,sans-serif">
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
But the areas that I wanted couldn't be shown completely in grey image. The polygons are not connected.</div>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
Any suggestion on how can I improve this?</div>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
<span id="x_cid:447fa535-f257-4dc6-b3fc-6e3077cf35dd"><boolean.jpg></span><br class="">
<br class="">
</div>
<div class="" style="margin-top:0px; margin-bottom:0px; font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
Thanks.</div>
<br class="">
<p class="" style="margin-top:0px; margin-bottom:0px"></p>
<div class="" style="margin-top:0px; margin-bottom:0px">Best,</div>
<div class="" style="margin-top:0px; margin-bottom:0px">Polly</div>
</div>
</div>
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--<span class="x_Apple-converted-space"> </span><br class="">
<div class="x_x_gmail_signature">Cory Quammen<br class="">
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To see the collection of prior postings to the list, visit the vtkusers Archives. Using vtkusers: To post a message to all the list members, send ...</div>
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