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Hi,
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<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>
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<div class="">Regards,</div>
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<div class="">Vincent<br class="">
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<div class="">Le 2 mars 2018 à 19:39, Polly Pui <<a href="mailto:polly_sukting@hotmail.com" class="">polly_sukting@hotmail.com</a>> a écrit :</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Hi Cory,</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Thanks for your reply.</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">I extracted the result in red image by using the vtkthreshold (ThresholdByLower=0.085). </div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">I tried to invert the extraction by using ThresholdByUpper=0.015, but the result weren't what i wanted.</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">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 style="margin-top: 0px; margin-bottom: 0px;" class=""><span id="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 style="margin-top: 0px; margin-bottom: 0px;" class="">Are we not able to obtain the areas using "difference" operation?</div>
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Best,
<div class="">Polly<br class="">
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<div id="divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Cory Quammen <<a href="mailto:cory.quammen@kitware.com" class="">cory.quammen@kitware.com</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Thursday, March 1, 2018 9:01 PM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>Polly Pui<br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:vtkusers@vtk.org" class="">vtkusers@vtk.org</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [vtkusers] vtkBooleanOperationPolyDataFilter</font>
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<div class="x_gmail_quote">On Thu, Mar 1, 2018 at 1:01 AM, Polly Pui<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:polly_sukting@hotmail.com" target="_blank" id="LPlnk550297" previewremoved="true" class="">polly_sukting@hotmail.com</a>></span><span class="Apple-converted-space"> </span>wrote:<br class="">
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Hi,</div>
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I would like to obtain the areas which are removed in 'Red Image'.</div>
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<div class="">Couldn't you invert the threshold operation to produce those areas instead of the red surface?<br class="">
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Green image is original data and Red image is the thresholded data. </div>
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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_m_1743815686831938821OWAAutoLink" id="LPlnk421431" target="_blank" previewremoved="true">https://www.vtk.org/Wiki/<wbr class="">VTK/Examples/Cxx/PolyData/<wbr class="">BooleanOperationPolyDataFilter</a></div>
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<div class="">The boolean operation filter won't work in this case because it does not handle boolean operations on overlapping surfaces.</div>
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<div class="">HTH,</div>
<div class="">Cory</div>
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But the areas that I wanted couldn't be shown completely in grey image. The polygons are not connected.</div>
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Any suggestion on how can I improve this?</div>
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<span id="cid:447fa535-f257-4dc6-b3fc-6e3077cf35dd"><boolean.jpg></span><br class="">
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Thanks.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Best,</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Polly</div>
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