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<DIV><FONT face=Arial size=2>Hi vtk-users!</FONT></DIV>
<DIV><FONT face=Arial size=2>Found the answer&nbsp;to this problem!</FONT></DIV>
<DIV><FONT face=Arial size=2>Before using vtkPolyDataNormals use 
vtkCleanPolyData to get just the points of the surface!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>code:</FONT></DIV>
<DIV>
<DIV>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">vtkExtractPolyDataGeometry* 
extract1 = vtkExtractPolyDataGeometry::New();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;SetInput(<SPAN 
lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;</SPAN>GetOutput());</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN><SPAN 
lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;SetImplicitFunction(plane);<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;ExtractInsideOn();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;ExtractBoundaryCellsOn();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;Update();</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt"><FONT face=Arial size=2>vtkCleanPolyData* clean= 
vtkCleanPolyData::New();</FONT></P>
<P style="MARGIN: 0cm 0cm 0pt"><FONT face=Arial 
size=2>clean-&gt;SetInput(extract1-&gt;GetOutput());</FONT></P>
<P style="MARGIN: 0cm 0cm 0pt"><FONT face=Arial 
size=2>clean-&gt;Update();</FONT></P>
<P style="MARGIN: 0cm 0cm 0pt"><FONT face=Arial size=2></FONT>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">vtkPolyDataNormals* 
norm = vtkPolyDataNormals::New();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">norm-&gt;SetInput(clean-&gt;GetOutput());</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">norm-&gt;<FONT 
size=2>ComputeCellNormalsOn();</P></FONT><o:p></o:p></SPAN>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">norm-&gt;Update();<o:p></o:p></SPAN></P></DIV></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Johannes</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV style="FONT: 10pt arial">----- Original Message ----- 
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A 
title=johannes.holzmeister@umit.at 
href="mailto:johannes.holzmeister@umit.at">Johannes Holzmeister</A> </DIV>
<DIV><B>To:</B> <A title=vtkusers@vtk.org 
href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</A> </DIV>
<DIV><B>Sent:</B> Friday, August 18, 2006 2:09 PM</DIV>
<DIV><B>Subject:</B> get only normals from extracted surface</DIV></DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial>Hi!</FONT></DIV>
<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial>I extracted a surface with "vtkExtractPolyDataGeometry". 
Now I want to get the normals of the extracted surface, then <SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: NimbusRomNo9L-Regu; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: NimbusRomNo9L-Regu; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA">I 
would like to add up</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA"> 
</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: NimbusRomNo9L-Regu; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: NimbusRomNo9L-Regu; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA">the 
vectors</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA"> 
</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: NimbusRomNo9L-Regu; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: NimbusRomNo9L-Regu; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA">and</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA"> 
</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: NimbusRomNo9L-Regu; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: NimbusRomNo9L-Regu; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA">get</SPAN><SPAN 
lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA"> 
</SPAN><SPAN lang=EN-US 
style="FONT-SIZE: 12pt; FONT-FAMILY: NimbusRomNo9L-Regu; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: NimbusRomNo9L-Regu; mso-ansi-language: EN-US; mso-fareast-language: DE; mso-bidi-language: AR-SA">a 
main vector.</SPAN> </FONT></DIV>
<DIV><FONT face=Arial>But how can I only get the Normals of the points which are 
insinde or at the surface? </FONT></DIV>
<DIV><FONT face=Arial>If&nbsp;I try "vtkPolyDataNormals" I get the normals of 
every single point of the image&nbsp;not only the normals of the 
surfacepoints.</FONT></DIV>
<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial>code:</FONT></DIV>
<DIV><FONT face=Arial>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">vtkExtractPolyDataGeometry* 
extract = vtkExtractPolyDataGeometry::New();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;SetInput(objectContainer4);<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;SetImplicitFunction(plane);<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;ExtractInsideOff();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;ExtractBoundaryCellsOn();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;Update();</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN>&nbsp;</FONT></P></DIV>
<DIV>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">vtkExtractPolyDataGeometry* 
extract1 = vtkExtractPolyDataGeometry::New();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;SetInput(<SPAN 
lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract-&gt;</SPAN>GetOutput());</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN><SPAN 
lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;SetImplicitFunction(plane);<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;ExtractInsideOn();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;ExtractBoundaryCellsOn();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">extract1-&gt;Update();</SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN>&nbsp;</P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">vtkPolyDataNormals* 
norm = vtkPolyDataNormals::New();<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">norm-&gt;SetInput(extract1-&gt;GetOutput());<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB 
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">norm-&gt;Update();<o:p></o:p></SPAN></P></DIV>
<DIV><FONT face=Arial><FONT size=+0></FONT></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial><FONT size=+0>Thank you for your 
help!!<BR>Johannes</FONT><BR></DIV></FONT></BODY></HTML>