[vtkusers] vtkDataSet interface in wrapped language

[Gerrick Bivins]

Hi all,
I have some data that I'd like to process/visualize using VTK pipelines.
At the moment, I'm investigating structured data but eventually I would like to use unstructured.
Anyway, I have access to the data through Java API's and I'm trying to understand the proper approach. For example,
if I want to use VTK to generate a slice through this data it feels like I need to do something like:

       Object javaGrid;// = ...;
        vtkDataSet dataset;// = ...;

        //translate javaGrid to vtkDataSet
        vtkPoints points;// = ...;
        dataset.setPoints(points);
        ///copy points
        for(javaGrid.getNumberOfPoints())
        {
            points.insertNextPoint(javaGrid.getPoint(i)[0], javaGrid.getPoint(i)[1], javaGrid.getPoint(i)[2]))
        }
        ...
        //topology
        for(cell:javaGrid.getNumberOfCells())
        {
              vtkCell translatedCell = getVTKCellFromJavaGridCell(cell);
              dataset.insertNextCell(cell.getType(),cell.getIds());
         }
         ///attributes
         for(attribute:javaGrid.getPointBasedAttributes())
         {
            vtkDataArray translatedArray = getVTKArrayFromJavaGridArray(attribute);
           dataset.getPointData().addArray(translatedArray);
         }
...
//Set up pipeline from dataset to generate slice

..



You, get the idea, brute force translation to vtkDataSet and then proceed as normal for VTK processing.

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

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.



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.



I also looked at some of the vtkProgrammable* classes but those seem to be more of a "translation".



Is it possible to do something like this with the existing API? If not, what are the suggested approaches to achieving something like this?



Gerrick

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