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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Hi,</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>I
am new to vtk. I have vtkPolyData as input. I need to use <b><span
style='font-weight:bold'>vtkGreedyTerrainDecimation</span></b> algorithm for
the decimation.</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>For
vtkGreedyTerrainDecimation, input is expected as vtkImageData, so I used
vtkProbeFilter toconvert the vtkPolyData to vtkImageData as follows:</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
vtkGreedyTerrainDecimation* decimate =
vtkGreedyTerrainDecimation::New();</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
vtkImageData* imageData = vtkImageData::New(); </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
vtkProbeFilter* probeFilter = vtkProbeFilter::New();</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'> </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
probeFilter->SetInput(imageData);</span></font> <o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
probeFilter->SetSource(polyData); // polyData is a member of my class</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
probeFilter->SetInputConnection(polyData->GetProducerPort()); </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'> and
passed this vtkImageData to vtkGreedyTerrainDecimation as follows:</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>
decimate->SetReduction(reductFactor );</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
decimate->BoundaryVertexDeletionOn(); </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
decimate->SetInputConnection(imageData->GetProducerPort()); </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>
decimate->Update( );</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'> But
at runtime I m getting the error as </span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black;font-weight:
bold'>
"vtkGreedyTerrainDecimation (0x0032F2A0): This class treats 2D height
fields only" </span></font></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>I
am not getting the decimated triangles after the execution of <b><span
style='font-weight:bold'>vtkGreedyTerrainDecimation algorithm.</span></b></span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt;text-indent:.5in'><font size=3
color=black face="Times New Roman"><span style='font-size:12.0pt;color:black'>Is
there any problem with the flow? Do I need to convert the vtkImageData to 2D
(height fields format) and if yes then how?</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'> Thanks
in advance<o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Manoj<o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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