<div dir="ltr">Hi,<div><br></div><div>Well, I would like to know how polygon loop being non-planar leads to such output. Because, the image shown in expectedOutput is also built of similar polygon loop. Its just that for few curved surfaces are rendered properly and few don't. I just want to know why is there such inconsistent behavior and how do I overcome this?</div><div><br></div><div>Thanks</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 15, 2017 at 10:56 AM, kenichiro yoshimi <span dir="ltr"><<a href="mailto:rccm.kyoshimi@gmail.com" target="_blank">rccm.kyoshimi@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi, <br><br>Your polygon loop is non-planar.<div><img src="cid:ii_j1itbiq12_15b700cc9d608067" width="280" height="167" style="margin-right:0px"><br><br></div><div><div>Howerver, the triangulate method used by vtkPolygon assumes that polygon points lie in a plane. I recommend to use vtkCylinderSource or vtkStructuredGrid to represent the side of surface of a cylinder.<br></div><div><br>Thanks,<br>yoshimi</div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">2017-04-14 0:38 GMT+09:00 Rakesh Patil <span dir="ltr"><<a href="mailto:rakesh.p@tataelxsi.co.in" target="_blank">rakesh.p@tataelxsi.co.in</a>></span>:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr">
<div id="m_-6915137630519013378m_6263524568884259717divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif" dir="ltr">
<p>Hi,</p>
<p><br>
</p>
<p>This question seems to be simple, but I am not able to get any output for this. I am not able to understand what is happening in this case:</p>
<p><br>
</p>
<p></p>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPoints</span>><span style="color:#c0c0c0"> </span>tpoints<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPoints</span>>::Ne<wbr>w();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPolygon</span>><span style="color:#c0c0c0"> </span>poly<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPolygon</span>>::N<wbr>ew();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkCellArray</span>><span style="color:#c0c0c0"> </span>carr<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkCellArray</span>>:<wbr>:New();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><pre style="font-size:16px;margin-top:0px;margin-bottom:0px"><span style="color:rgb(128,0,128)">vtkSmartPointer</span><<span style="color:rgb(128,0,128)">vtkPolyData</span>><span style="color:rgb(192,192,192)"> </span>polyData<span style="color:rgb(192,192,192)"> </span>=<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vtkSmartPointer</span><<span style="color:rgb(128,0,128)">vtkPolyData</span>>::<wbr>New();</pre></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.5</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">3</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">1.5</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">4.08748</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.87967</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">3.05391</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.95899</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">1.74755</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.68466</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span><span style="color:#000080">0.28509</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.99187</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">1.20284</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.85316</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.58332</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.28094</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.73305</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.32631</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.54931</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.07456</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.95919</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">0.637487</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.92609</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0.856528</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.45295</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">2.27403</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.58205</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">3.4884</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">1.5</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">3</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.5</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">4.39116</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.58205</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">3.4884</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.45295</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">2.27403</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.92609</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0.856528</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(-<span style="color:#000080"><wbr>4.95919</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">0.637487</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(-<span style="color:#000080"><wbr>4.54931</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.07456</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(-<span style="color:#000080"><wbr>3.73305</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.32631</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(-<span style="color:#000080"><wbr>2.58332</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.28094</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(-<span style="color:#000080"><wbr>1.20284</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.85316</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#000080">0<wbr>.28509</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.99187</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#000080">1<wbr>.74755</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">4.68466</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#000080">3<wbr>.05391</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">3.95899</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#000080">4<wbr>.08748</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.87967</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px">poly->GetPointIds()->InsertNex<wbr>tId(tpoints->InsertNextPoint(<span style="color:#000080">4<wbr>.39116</span>,<span style="color:#c0c0c0"> </span>-<span style="color:#000080">2.39117</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">6</span>));</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px">carr->InsertNextCell(poly);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>polyData-><span style="font-style:italic">SetPoints</span>(tpoints);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>polyData->SetPolys(carr);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkTriangleFil<wbr>ter</span>><span style="color:#c0c0c0"> </span>tfilter<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkTriangleFil<wbr>ter</span>>::New();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>tfilter->SetInputData(polyData<wbr>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>tfilter-><span style="font-style:italic">Update</span>();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPolyDataMap<wbr>per</span>><span style="color:#c0c0c0"> </span>pmapper<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkPolyDataMap<wbr>per</span>>::New();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>pmapper->SetInputConnection(tf<wbr>ilter->GetOutputPort());</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkActor</span>><span style="color:#c0c0c0"> </span>actor<span style="color:#c0c0c0"> </span>=<span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><<span style="color:#800080">vtkActor</span>>::New<wbr>();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>actor-><span style="font-style:italic">SetMapper</span>(pmapper);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>actor->GetProperty()->SetRepre<wbr>sentationToSurface();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>actor->GetProperty()-><span style="font-style:italic">EdgeVisi<wbr>bilityOn</span>();</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>actor->GetProperty()-><span style="font-style:italic">SetEdgeC<wbr>olor</span>(<span style="color:#000080">1.0</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0.0</span>,<span style="color:#c0c0c0"> </span><span style="color:#000080">0.0</span>);</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#008000"></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>renderer->AddActor(actor);</pre>
<pre style="margin-top:0px;margin-bottom:0px"></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:#c0c0c0"> </span>renderer->ResetCamera();</pre>
<br>
<p></p>
<p><br>
</p>
<p>I am not able to view the output if I use vtkTriangleFilter. I have attached two screenshots. One is to show how the expected output should come. Another is the vtk's output without applying vtkTriangleFilter. How do I get the curved surfaces based on the
above geometry (points)?</p>
<p><br>
</p>
<p>Am I missing anything there?</p>
<p><br>
</p>
<p><br>
</p>
<div id="m_-6915137630519013378m_6263524568884259717Signature">
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<p>Thanks & Regards</p><span class="m_-6915137630519013378HOEnZb"><font color="#888888">
<p>Rakesh Patil</p>
<p><br>
</p>
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