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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks for the tips Cory.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I also received this morning the latest Kitware blog on Scalable Point Processing in VTK:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><a href="https://blog.kitware.com/scalable-point-processing-in-vtk/">https://blog.kitware.com/scalable-point-processing-in-vtk/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Will look into and follow this closely also.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks all<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Cory Quammen [mailto:cory.quammen@kitware.com]
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<b>Sent:</b> Tuesday, 27 September 2016 12:01 AM<br>
<b>To:</b> Fraser Callaghan <fraser.callaghan@sydney.edu.au><br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] Count polydata in VTI voxels<o:p></o:p></span></p>
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<p class="MsoNormal">Fraser,<o:p></o:p></p>
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<p class="MsoNormal">I don't know if any filter in VTK do exactly what you want. You can try using the filter vtkBinningFilter from<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://github.com/MADAI/MADAIWorkbench/tree/master/Plugins/BinningFilter">https://github.com/MADAI/MADAIWorkbench/tree/master/Plugins/BinningFilter</a><o:p></o:p></p>
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<p class="MsoNormal">Otherwise, you can loop through and count the points in each voxel manually. You'll probably want to use a subclass of vtkAbstractPointLocator (<a href="http://www.vtk.org/doc/nightly/html/classvtkAbstractPointLocator.html">http://www.vtk.org/doc/nightly/html/classvtkAbstractPointLocator.html</a>)
to accelerate point queries.<o:p></o:p></p>
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<p class="MsoNormal">HTH,<o:p></o:p></p>
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<p class="MsoNormal">Cory<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Sep 26, 2016 at 7:52 AM, Fraser Callaghan <<a href="mailto:fraser.callaghan@sydney.edu.au" target="_blank">fraser.callaghan@sydney.edu.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello,
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have a dense set of polydata and would like to convert to a vtkImageData with each cell containing a count of the number of points, from the poly data, that are in that cell (returning
a CellData array) (I suppose any input data would be relevant). <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Does a method exist that will count the points within a voxel like this? Or am I better to loop through each cell counting as I go? (or something else – I guess some clever AMR
approach would be most efficient?)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Note – vtkGaussianSplatter does not give the result I want – when trying to limit a point’s influence to only one cell either no influence of a “bubble” effect exists.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks for your help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#888888">Fraser<o:p></o:p></span></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">Cory Quammen<br>
Staff R&D Engineer<br>
Kitware, Inc.<o:p></o:p></p>
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