<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Thanks Jerome. I actually started with a binary volume and converted to the polydata contour. Sounds like this step may be unnecessary.</div><div><br></div><div>Can anyone point me to an example of getting an image data contour from a filled binary volume? I've checked the email archives and haven't seen anything yet.</div><div><br></div><div>Thanks,</div><div>Sara</div><div><br><div><div>On Mar 12, 2011, at 8:55 AM, Jérôme wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi Sara,<br>In my mind, theproblem is that your polydata sampling does not match the image sampling. If you managed to get a filled binary volume from your polydata surface, then you can try to compute the gradient of this image. Another solution is to substract the binary volume from a dilated version of the binary volume: the output will contain only the contour voxels.<br> <br>Note, they are a lot of other solutions, but these one may be implemented thanks to native VTK filters. <br><br>HTH,<br>Jerome<br><br><br><div class="gmail_quote">2011/3/12 Sara Rolfe <span dir="ltr"><<a href="mailto:smrolfe@u.washington.edu">smrolfe@u.washington.edu</a>></span><br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div style="word-wrap: break-word;"><div>Hello,</div><div><br></div><div>I have a vtkPolydata contour that I'd like to convert into image data. This is similar to the example here:</div> <div><h1><span style="font-weight: normal;"><font size="3"><span style="font-size: 12px;">VTK/Examples/Cxx/PolyData/PolyDataContourToImageData</span></font></span></h1></div><div>except that I don't want the image contour to be filled. I thought that I could get around this by using polyData->GetPoints, iterating through the point list, converting to an ITK image index, and assigning the image data value. However, I get the ridge artifact shown in the image I've attached. </div> <div><br></div><div>Please let me know if you have any ideas on the optimal method to solve this problem.</div><div><br></div><div>Thanks,</div><div>Sara</div><font color="#888888"><div><br></div><br></font></div><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><br> <br></blockquote></div><br></blockquote></div><br></div></body></html>