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<p style="margin-top:0;margin-bottom:0">Hi Cory,</p>
<p style="margin-top:0;margin-bottom:0">Thanks for your reply. </p>
<p style="margin-top:0;margin-bottom:0">I could get those regions by calling AllScalarsOff correctly now.</p>
<p style="margin-top:0;margin-bottom:0">Thank you!</p>
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<p style="margin-top:0;margin-bottom:0">Best,<br>
Polly</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Cory Quammen <cory.quammen@kitware.com><br>
<b>Sent:</b> Saturday, March 3, 2018 3:03 AM<br>
<b>To:</b> Polly Pui<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] vtkBooleanOperationPolyDataFilter</font>
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<div class="x_gmail_quote">On Fri, Mar 2, 2018 at 1:39 PM, Polly Pui <span dir="ltr">
<<a href="mailto:polly_sukting@hotmail.com" target="_blank" id="LPlnk558143" previewremoved="true">polly_sukting@hotmail.com</a>></span> wrote:<br>
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<p style="margin-top:0; margin-bottom:0">Hi Cory,</p>
<p style="margin-top:0; margin-bottom:0">Thanks for your reply.</p>
<p style="margin-top:0; margin-bottom:0">I extracted the result in red image by using the vtkthreshold (ThresholdByLower=0.085). </p>
<p style="margin-top:0; margin-bottom:0">I tried to invert the extraction by using ThresholdByUpper=0.015, but the result weren't what i wanted.</p>
<p style="margin-top:0; margin-bottom:0">The red image with white holes (the removed areas are what i wanted). The blue area is extracted using the inverted value of threshold.</p>
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<div>I think calling vtkThreshold::AllScalarsOff() should fix it. <br>
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<p style="margin-top:0; margin-bottom:0"><img naturalheight="800" naturalwidth="800" size="68707" width="317" height="317" style="width: 317px; height: 317px; user-select: none;" tabindex="0" id="118633_rs|3" src="cid:f7c26712-986e-4e9b-9c1f-0174777617ab"><br>
I cant really understand what do you mean by boolean operations cant work on this case.</p>
<p style="margin-top:0; margin-bottom:0">Are we not able to obtain the areas using "difference" operation?</p>
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<div>You are right in principle that a boolean operation should be able to do this. In practice, however, the existing boolean operations filter makes some assumptions about the input data, namely that each input geometry defines an enclosed volume and that
no two intersecting polygons in the input geometries are coplanar. The output of the filter is a new surface that encloses the union, difference, or intersection of the volumes enclosed by the input geometries. This test case violates both assumptions, hence
it won't work.</div>
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<div>Best,</div>
<div>Cory<br>
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Best,
<div>Polly<br>
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<div id="x_m_3679278712894312242divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> Cory Quammen <<a href="mailto:cory.quammen@kitware.com" target="_blank" id="LPlnk319595" previewremoved="true">cory.quammen@kitware.com</a>><br>
<b>Sent:</b> Thursday, March 1, 2018 9:01 PM<br>
<b>To:</b> Polly Pui<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank" id="LPlnk79159" previewremoved="true">
vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] vtkBooleanOperationPolyDataFil<wbr>ter</font>
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<div class="x_m_3679278712894312242x_gmail_quote"><span class="">On Thu, Mar 1, 2018 at 1:01 AM, Polly Pui
<span dir="ltr"><<a href="mailto:polly_sukting@hotmail.com" id="LPlnk901617" target="_blank" previewremoved="true">polly_sukting@hotmail.com</a>></span> wrote:<br>
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Hi,</p>
<p style="font-family:Calibri,Helvetica,sans-serif,serif,EmojiFont; font-size:16px">
I would like to obtain the areas which are removed in 'Red Image'.</p>
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<div>Couldn't you invert the threshold operation to produce those areas instead of the red surface?<br>
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Green image is original data and Red image is the thresholded data. </p>
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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_3679278712894312242x_m_1743815686831938821OWAAutoLink" id="LPlnk86368" target="_blank" previewremoved="true">https://www.vtk.org/Wiki/VT<wbr>K/Examples/Cxx/PolyData/Boolea<wbr>nOperationPolyDataFilter</a></p>
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<div>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>HTH,</div>
<div>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.</p>
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Any suggestion on how can I improve this?</p>
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<img naturalheight="491" naturalwidth="1010" size="29351" width="758" height="368" style="width: 758px; height: 368.493px; user-select: none;" tabindex="0" id="589616_rs|3" src="cid:447fa535-f257-4dc6-b3fc-6e3077cf35dd"><br>
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Thanks.</p>
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<p style="margin-top:0; margin-bottom:0">Best,</p>
<p style="margin-top:0; margin-bottom:0">Polly</p>
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