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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Thank you both for your answers!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>FindPoint works perfect with vtkPolyData, but now I think I can’t use vtkPolyData. Instead I probably have to use vtkImageData. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>My VTK pipeline looks like this:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1.)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Create vtkImageData with all points<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2.)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Use vtkMarchingSquares filter to get vtkPolyData representing some iso lines<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>3.)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Some unimportant clipping stuff…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>If I use the vtkPolyData object from vtkMarchingSquares I get values which make sense. But it seems like marching squares removes all points where no iso lines are drawn. I only find ids of points which are on the iso lines. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>So my idea was to use vtkImageData. But not even the simpliest example works with vtkImageData and FindPoint:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:blue'>double</span><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:black'>[] pos = imageData.GetPoint(200);<o:p></o:p></span></p><pre style='background:white'><span lang=EN-US style='font-family:Consolas;color:green'>// pos contains 18.0, -29.0, 0.0 which seems to be correct</span><span lang=EN-US style='font-family:Consolas;color:black'><o:p></o:p></span></pre><p class=MsoNormal style='background:white'><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:blue'>int</span><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:black'> id = imageData.FindPoint(pos[0], pos[1], pos[2]);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>I would expect ‘id’ to have the value 200. But it always has the value -1. The documentation says that a return value < 0 means that the point can’t be found (maybe it’s outside of the vtkImageData object). Could somebody please tell me why FindPoint always returns -1?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Thank you,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Lukas<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Gonzalo Amadio [mailto:gonzaloamadio@gmail.com] <br><b>Sent:</b> Dienstag, 21. August 2012 15:48<br><b>To:</b> Kevin H. Hobbs<br><b>Cc:</b> Boehm, Lukas; vtkusers@vtk.org<br><b>Subject:</b> Re: [vtkusers] Find point by coordiante<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>I think this will work!..<br><br><a href="http://www.vtk.org/doc/release/5.6/html/a00430.html#fb20db494bf2e8c0aff4ff2fcf7d6a22">http://www.vtk.org/doc/release/5.6/html/a00430.html#fb20db494bf2e8c0aff4ff2fcf7d6a22</a><br><br>The doc says "find the closes point to the coordinates provided as arguiment"<o:p></o:p></p><div><p class=MsoNormal>2012/8/21 Kevin H. Hobbs <<a href="mailto:hobbsk@ohio.edu" target="_blank">hobbsk@ohio.edu</a>><o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>On 08/21/2012 09:18 AM, Boehm, Lukas wrote:<br>> Hello,<br>><br>><br>><br>> I’ve got a short question. I have a vtkPoints object and a coordinate<br>> (x,y,z). Is there a way to get the id of the closest point to this<br>> coordinate? I didn’t find anything.<br>><o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>You need a point locator.<br><br><a href="http://www.vtk.org/doc/nightly/html/classvtkPointLocator.html" target="_blank">http://www.vtk.org/doc/nightly/html/classvtkPointLocator.html</a><br><br><br>_______________________________________________<br>Powered by <a href="http://www.kitware.com" target="_blank">www.kitware.com</a><br><br>Visit other Kitware open-source projects at <a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br><br>Please keep messages on-topic and check the VTK FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a><br><br>Follow this link to subscribe/unsubscribe:<br><a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a><o:p></o:p></p></div><p class=MsoNormal><br><br clear=all><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>-- <br>--------<br>Gonzalo Amadio<o:p></o:p></p></div></body></html>