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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks Sebastien.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This is good info. Upon some further digging, I’ve found it may be possible for me to implement some
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">interfaces on my side that wrap the vtk objects and the vtk pipelines.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’ll have to do a translation of the output polydata from the pipelines to render but I may still be able<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">to avoid the initial input copy.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Gerrick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Sebastien Jourdain [mailto:sebastien.jourdain@kitware.com]
<br>
<b>Sent:</b> Wednesday, June 26, 2013 8:42 AM<br>
<b>To:</b> Gerrick Bivins<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] vtkDataSet interface in wrapped language<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi <span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Gerrick,</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">their is no way to my knowledge in Java to make the C++ layer use your data structure. (At least easily with what is available within VTK)</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">The vtkProgrammable* are used to embed your filter/source logic into VTK pipeline, but it still require you to create a vtkDataObject anyway... </span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">It will be easier to do it the other way around. Make Java use a VTK/C++ data structure.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Seb</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jun 26, 2013 at 8:44 AM, Gerrick Bivins <<a href="mailto:Gerrick.Bivins@halliburton.com" target="_blank">Gerrick.Bivins@halliburton.com</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">Hi all,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have some data that I’d like to process/visualize using VTK pipelines.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">At the moment, I’m investigating structured data but eventually I would like to use unstructured.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Anyway, I have access to the data through Java API’s and I’m trying to understand the proper approach. For example,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">if I want to use VTK to generate a slice through this data it feels like I need to do something like:<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;text-autospace:none">
<span style="font-size:10.0pt;font-family:Consolas"> <b><i>Object javaGrid;<span style="color:#3F7F5F">// = …;</span></i></b></span><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> vtkDataSet dataset;<span style="color:#3F7F5F">// = …;</span></span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> </span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#3F7F5F">
//translate javaGrid to vtkDataSet</span></span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> vtkPoints points;<span style="color:#3F7F5F">// = …;</span></span></i></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none">
<b><i><span style="font-size:10.0pt;font-family:Consolas"> dataset.<u>setPoints</u>(points);</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#3F7F5F">
///copy points</span></span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <u><span style="color:#7F0055">for</span>(javaGrid.getNumberOfPoints())</u></span></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> {</span></u></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> points.insertNextPoint(javaGrid.getPoint(i)[0], javaGrid.getPoint(i)[1], javaGrid.getPoint(i)[2]))</span></u></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> }</span></u></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> …</span></u></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#3F7F5F">
//topology</span></span></u></i></b><o:p></o:p></p>
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<b><i><u><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#7F0055">
for</span>(cell:javaGrid.getNumberOfCells())</span></u></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> {</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <u>vtkCell</u> translatedCell = getVTKCellFromJavaGridCell(<u>cell</u>);</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> dataset.insertNextCell(<u>cell</u>.getType(),<u>cell</u>.getIds());</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> }</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#3F7F5F">
///attributes</span></span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <span style="color:#7F0055">
for</span>(<u>attribute</u>:javaGrid.<u>getPointBasedAttributes</u>())</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> {</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> <u>vtkDataArray</u> translatedArray = getVTKArrayFromJavaGridArray(<u>attribute</u>);</span></i></b><o:p></o:p></p>
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<b><i><span style="font-size:10.0pt;font-family:Consolas"> dataset.<u>getPointData</u>().addArray(translatedArray);</span></i></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i><span style="font-size:10.0pt;font-family:Consolas"> }</span></i></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i><span style="font-size:10.0pt;font-family:Consolas">…</span></i></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i><span style="font-size:10.0pt;font-family:Consolas">//Set up pipeline from dataset to generate slice</span></i></b><o:p></o:p></p>
<p>..<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>You, get the idea, brute force translation to vtkDataSet and then proceed as normal for VTK processing.<o:p></o:p></p>
<p>Ideally, what I would prefer to do in Java is implement some interface or extend some abstract class that makes my data look like a vtkDataSet
<o:p></o:p></p>
<p>w/o translating. I saw the vtkGenericDataSet class but I’m not sure if it’s intended for what I’m wanting to do or if it works in a wrapped language.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>For example, if I have data that represents a structured grid, I really only need to specify my dx,dy,dz and origin and the attributes but it looks like there is much more in the vtkGenericDataSet to implement than that.
<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>I also looked at some of the vtkProgrammable* classes but those seem to be more of a “translation”.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Is it possible to do something like this with the existing API? If not, what are the suggested approaches to achieving something like this?<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Gerrick<o:p></o:p></p>
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