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<p class=MsoNormal><span lang=EN-NZ>Hi all, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>I use vtkDelaunay2D to make a constrained
triangulation mesh from a set of points and a set of polylines (see
attached image). I need to mark the mesh into different regions, such as using
red to render the triangles of a region inside a contour, and using blue to
render the triangles of a region between two contours. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>My question is how to divide the mesh into
regions by the constrained polylines?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Here is part of my code:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt;text-autospace:none'><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New";color:blue'>this</span><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>->terrainRawData->InsertNextCell(VTK_POLY_LINE,
cellIdList); // the cellIdList represents a polyline<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt;text-autospace:none'><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New";color:blue'>this</span><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>->terrainRawData->SetPoints(<span
style='color:blue'>this</span>->terrainPts);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-NZ
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt;text-autospace:none'><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>vtkSmartPointer<vtkPolyData>
aPolyData = vtkSmartPointer<vtkPolyData>::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt;text-autospace:none'><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>aPolyData->SetPoints(<span
style='color:blue'>this</span>->terrainPts);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-NZ
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:36.0pt;text-autospace:none'><span
lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>vtkSmartPointer<vtkDelaunay2D>
delaunay2D = vtkSmartPointer<vtkDelaunay2D>::New();<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-NZ
style='font-size:10.0pt;font-family:"Courier New"'>
delaunay2D->SetInput( aPolyData );<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-NZ
style='font-size:10.0pt;font-family:"Courier New"'>
delaunay2D->SetSource( <span style='color:blue'>this</span>->terrainRawData
);<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span lang=EN-NZ
style='font-size:10.0pt;font-family:"Courier New"'>
delaunay2D->Update();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ style='font-size:10.0pt;font-family:"Courier New"'>
<span style='color:blue'>this</span>->terrainTri =
delaunay2D->GetOutput();</span><span lang=EN-NZ><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Thank you very much, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Jing<o:p></o:p></span></p>
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