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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal">I have some data that I’d like to process/visualize using VTK pipelines.<o:p></o:p></p>
<p class="MsoNormal">At the moment, I’m investigating structured data but eventually I would like to use unstructured.<o:p></o:p></p>
<p class="MsoNormal">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">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"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> <b><i>Object javaGrid;</i></b></span><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">// = …;</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> vtkDataSet dataset;</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">// = …;</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">//translate javaGrid to vtkDataSet</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> vtkPoints points;</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">// = …;</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> dataset.<u>setPoints</u>(points);</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">///copy points</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></i></b><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">for</span></u></i></b><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black">(javaGrid.getNumberOfPoints())</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black"> {</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black"> points.insertNextPoint(javaGrid.getPoint(i)[0], javaGrid.getPoint(i)[1], javaGrid.getPoint(i)[2]))</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black"> }</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black"> …</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></u></i></b><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">//topology</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></u></i></b><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">for</span></u></i></b><b><i><u><span style="font-size:10.0pt;font-family:Consolas;color:black">(cell:javaGrid.getNumberOfCells())</span></u></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> {</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
<u>vtkCell</u> translatedCell = getVTKCellFromJavaGridCell(<u>cell</u>);</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> dataset.insertNextCell(<u>cell</u>.getType(),<u>cell</u>.getIds());</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> }</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#3F7F5F">///attributes</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">for</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">(<u>attribute</u>:javaGrid.<u>getPointBasedAttributes</u>())</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> {</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">
<u>vtkDataArray</u> translatedArray = getVTKArrayFromJavaGridArray(<u>attribute</u>);</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> dataset.<u>getPointData</u>().addArray(translatedArray);</span></i></b><b><i><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black"> }<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">…<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:10.0pt;font-family:Consolas;color:black">//Set up pipeline from dataset to generate slice</span><o:p></o:p></i></b></p>
<p class="MsoListParagraph">..<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph">You, get the idea, brute force translation to vtkDataSet and then proceed as normal for VTK processing.<o:p></o:p></p>
<p class="MsoListParagraph">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 class="MsoListParagraph">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 class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph">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 class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph">I also looked at some of the vtkProgrammable* classes but those seem to be more of a “translation”.<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph">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 class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph">Gerrick<o:p></o:p></p>
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