<div dir="ltr">Hi Fantasy,<div><br></div><div>I don't know what you mean by "dimension index".</div><div><br></div><div>When you display in the 3D viewer, make sure the window/level are set correctly in the viewer. The outside of the region is given a value of zero, but zero can show as gray depending on how the window/level is set.</div><div><br></div><div> - David</div><div><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jan 27, 2016 at 12:22 PM, Chen, Lifan <span dir="ltr"><<a href="mailto:LCHEN41@mgh.harvard.edu" target="_blank">LCHEN41@mgh.harvard.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div style="direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt">Hey David,
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<div>I use stencil and it works well, however, the dimension index of the output of stencil remain unchanged which I supposed to change according to the size of region I choose and there is a gray part around the region I choose when displaying in the 3-D viewer.
Do you what is the problem?</div>
<div><br>
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<div>Thanks,</div>
<div>Fantasy<br>
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<div style="direction:ltr"><font face="Tahoma" size="2" color="#000000"><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1月26日 16:47<br>
<b>收件人:</b> Chen, Lifan<br>
<b>抄送:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>主题:</b> Re: [vtkusers] How to select a polygon region in a vtkImageData<br>
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<div dir="ltr">Hi Fantasy,
<div><br>
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<div>VTK has "stencil" operations for extracting regions from vtkImageData. For example:</div>
<div><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolyDataToImageData" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolyDataToImageData</a><br>
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<div><br>
</div>
<div>There are a few VTK test samples that show different ways to use stencils:</div>
<div><br>
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<div>
<div>Imaging/Core/Testing/Cxx/TestStencilWithLasso.cxx</div>
<div>Imaging/Core/Testing/Cxx/TestStencilWithPolyDataContour.cxx</div>
<div>Imaging/Core/Testing/Cxx/TestStencilWithPolyDataSurface.cxx</div>
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<div><br>
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<div>
<div>Imaging/Core/Testing/Python/TestBlendStencil.py</div>
<div>Imaging/Core/Testing/Python/TestLassoStencil.py</div>
<div>Imaging/Core/Testing/Python/TestROIStencil.py</div>
<div>Imaging/Core/Testing/Python/TestStencilToImage.py</div>
<div>Imaging/Core/Testing/Python/TestStencilWithFunction.py</div>
<div>Imaging/Core/Testing/Python/TestStencilWithImage.py</div>
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<div>Extraction of a polygonal region can be done with vtkLassoStencilSource</div>
<div>or with vtkPolyDataToImageStecil.</div>
<div><br>
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<div>Cheers,</div>
<div> - David</div>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jan 26, 2016 at 2:22 PM, Chen, Lifan <span dir="ltr">
<<a href="mailto:LCHEN41@mgh.harvard.edu" target="_blank">LCHEN41@mgh.harvard.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div style="direction:ltr;font-family:Tahoma;color:rgb(0,0,0);font-size:10pt">
Hey all,
<div><br>
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<div>I am working on a project that requires to manually extract a region from a 3D vtkImageData. I read the example on how to select a region in a vtkPolyData in VTK/Examples/Cxx/PolyData/SelectPolyData (<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/SelectPolyData" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/SelectPolyData</a>)<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/SelectPolyData" style="font-size:10pt" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/SelectPolyData</a></div>
<div>However, it doesn't work for vtkImageData. Is there any method to solve this problem?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Fantasy Chen</div>
</div>
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