<div dir="ltr">Hi Liu Peng,<div><br></div><div>For creating a model, it is common to allow the user to set just a lower threshold (rather than a range), and to use the lower threshold as the isovalue. If you send the code for the whole pipeline, that might help.</div><div><br></div><div> - David</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 16, 2016 at 11:27 PM, Liu_tj <span dir="ltr"><<a href="mailto:tjlp@netease.com" target="_blank">tjlp@netease.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, David,<br><br>If I don't use vtkImageThreshol, how to generate 3D model from the points whose grayscale is in some specific range? This range can be changed by the user. <div><br>Thanks<br>Liu Peng<br></div><span class="">
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<br> 在2016-03-17，"David Gobbi" <<a href="mailto:david.gobbi@gmail.com" target="_blank">david.gobbi@gmail.com</a>> 写道：
</span><blockquote style="padding-left:1ex;margin:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><span class="">
-----原始邮件-----<br>
<b>发件人:</b>"David Gobbi" <<a href="mailto:david.gobbi@gmail.com" target="_blank">david.gobbi@gmail.com</a>> <br>
<b>发送时间:</b>2016年03月17日 星期四<br>
<b>收件人:</b>"Liu_tj" <<a href="mailto:tjlp@netease.com" target="_blank">tjlp@netease.com</a>><br>
<b>抄送:</b>"vtkusers" <<a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>><br>
</span><b>主题:</b>Re: Re: [vtkusers] High memory cost of vtkDecimatePro for 3D model generation from DICOM series<div><div class="h5"><br>
<br><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Mar 16, 2016 at 10:35 PM, Liu_tj <span dir="ltr"><<a href="mailto:tjlp@netease.com" target="_blank">tjlp@netease.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,David,<br><br>If using vtkImageThreshold before vtkMarchingCubes is not a good option, what other better way do you have?<br></blockquote><div><br></div><div>The output of the reader should go directly into vtkMarchingCubes.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Beside, for the isovalue, I try 2,3,4 and marched->GetNumberOfPoints() return 0, only isovalue is 1 and marched->GetNumberOfPoints() return a number greater than 0. I have no idea this is relating to the DICOM series or other problem.<br></blockquote><div><br></div><div>If you remove vtkImageThreshold, and put the output of the reader directly into vtkMarchingCubes, then you should be able to use an isovalue somewhere between 100 and 2000 and get a good result. </div><div><br></div><div>Also, after vtkMarchingCubes, you can use vtkConnectivityFilter to clean up the polydata before you decimate it.</div><div><br></div><div> - David</div></div></div></div>
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