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<div class=Section1><pre><font size=2 face=Arial><span lang=DE
style='font-size:10.0pt;font-family:Arial'>Hi </span></font>Lin Zhang,<o:p></o:p></pre>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I had the same „problem“ as you before. The
reason is, that when applying any transformation/rotation matrix to a dataset
(e.g. with vtkTransform) it will not change the position of the original points.
(It changes only the position of actors but you can’t querry their
WorldCoordinates)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>You will have to use vtkTransformPolyDataFilter on the dataset
to really transform it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Here is an example (translating one point only):<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> vtkPoints
*inputPoints2 = vtkPoints::New(); <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
inputPoints2->SetDataTypeToDouble();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
inputPoints2->SetNumberOfPoints(1);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
inputPoints2->SetPoint(0,corPos);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> vtkPolyData *poly2 =
vtkPolyData::New();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
poly2->SetPoints(inputPoints1);
<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> vtkTransformPolyDataFilter
*transPolyData2 = vtkTransformPolyDataFilter::New();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
transPolyData2->SetInput(poly2);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
transPolyData2->SetTransform(sag_mprTransform); <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
transPolyData2->Update();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
vtkPoints *outputPoints2 =transPolyData2->GetOutput()->GetPoints();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
double TranslatedPoint2[3];<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
TranslatedPoint2 = outputPoints2->GetPoint(0); <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
transPolyData->Delete();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> poly2->Delete();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
inputPoints2->Delete();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
outputPoints2->Delete();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Better to look for vtkTransformPolyDataFilter
to get better examples.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Michael<o:p></o:p></span></font></p>
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