[vtkusers] vtkDataSet interface in wrapped language

[Sebastien Jourdain]

Hi Gerrick,

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)
The vtkProgrammable* are used to embed your filter/source logic into VTK
pipeline, but it still require you to create a vtkDataObject anyway...

It will be easier to do it the other way around. Make Java use a VTK/C++
data structure.

Seb


On Wed, Jun 26, 2013 at 8:44 AM, Gerrick Bivins <
Gerrick.Bivins at halliburton.com> wrote:

>  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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