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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>Hi all,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>I have a question about interpolation by vtk. </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>Now there are some points: (x, y, z, a). </FONT></SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>For example: <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>3.4 <SPAN style="mso-tab-count: 1"> </SPAN>5.6<SPAN style="mso-tab-count: 1"> </SPAN>2.3<SPAN style="mso-tab-count: 1"> </SPAN>1.0<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>6.5<SPAN style="mso-tab-count: 1"> </SPAN>7.1<SPAN style="mso-tab-count: 1"> </SPAN>13.3<SPAN style="mso-tab-count: 1"> </SPAN>2.0<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>3.3<SPAN style="mso-tab-count: 1"> </SPAN>123.9<SPAN style="mso-tab-count: 1"> </SPAN>101.1<SPAN style="mso-tab-count: 1"> </SPAN>9.0<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>12.2<SPAN style="mso-tab-count: 1"> </SPAN>98.1<SPAN style="mso-tab-count: 1"> </SPAN>1.9<SPAN style="mso-tab-count: 1"> </SPAN>12.0<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>…<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>99.0<SPAN style="mso-tab-count: 1"> </SPAN>23.0<SPAN style="mso-tab-count: 1"> </SPAN>12.8<SPAN style="mso-tab-count: 1"> </SPAN>3.7<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>The first three value of each point means the coordinate value “x, y, z” of the point, and the fourth value “a” means the attribute value of the point (maybe means the color of the point or something like that). <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>Now I want to interpolate these points onto regular grid points, can I use vtk to realize it? <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>By the way, I know that vtkProbeFilter can do the interpolation work. I’ve tried it:<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>vtkImageData *image=vtkImageData::New();<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>image->SetDimensions(60,60,60);<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>image->SetSpacing(0.3,0.3,0.3);<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>image->SetOrigin(0,0,0);<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#808080> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>vtkDataSetReader *reader =vtkDataSetReader::New();<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>reader->SetFileName("test.vtk");<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#808080> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>vtkProbeFilter *probe=vtkProbeFilter ::New();<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>probe->SetInput(image);<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt 1in"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#808080>probe->SetSource(reader->GetOutput());<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>But I found that when test.vtk is unstructured_grid and the cell types are all equal to 1, <SPAN style="mso-spacerun: yes"> </SPAN>that is, the data file consist of scattered points, the output has nothing we can see, and the output file is structured_points, and the attribute value of each structured point is equal to 0. So I guess that when we use the vtkProbeFilter, the cell type of the input file can not be 1.<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p><FONT color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT color=#000000>Then, how to interpolate these points onto regular grid points by vtk? Who can help me? Thanks a lot!<o:p></o:p></FONT></SPAN></P><br /><hr />不登录就能管理多个邮件帐户，试试 Windows Live Mail。 <a href='http://get.live.com/betas/maildesktop_betas' target='_new'>立即尝试！</a></body>
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