[vtkusers] show celldata on vtkImagePlaneWidget

[Dean Inglis]

Hi Tom,

you are doing the right thing by converting cell data to point data in this 
case.  You could try
setting the interpolation to nearest neighbor and turning interpolation off:

iPlaneWidgetX.SetResliceInterpolateToNearestNeighbour();
iPlaneWidgetX.TextureInterpolateOff();

Dean

Hi,

Using Activiz, I'm trying to display imagedata (CELLDATA, not pointdata) on 
a vtkImagePlaneWidget, just as simple gridcells like this: 
(https://picasaweb.google.com/lh/photo/SYdgbXrXm-4SRfVHCufBLfK3gj7O8KOK36SDLJLIWK8?feat=directlink) 
but it doesn't show anything. What I try is this:

  vtkXMLImageDataReader reader = vtkXMLImageDataReader.New();
  reader.SetFileName(imgFileNameTotal);
  reader.SetCellArrayStatus("CellData", 1); //only celldata
  reader.SetPointArrayStatus("Scalars_", 0); //no pointdata
  reader.Update();

  //Create ImagePlaneWidget
  vtkImagePlaneWidget iPlaneWidgetX = new vtkImagePlaneWidget();
  iPlaneWidgetX.SetInput(reader.GetOutput());
  iPlaneWidgetX.SetPlaneOrientationToXAxes();
  iPlaneWidgetX.SetSliceIndex(10);

  //Rendering, Camera & interactors
  vtkRenderer ren1 = 
renderWindowControl1.RenderWindow.GetRenderers().GetFirstRenderer();
  vtkRenderWindow renWin = renderWindowControl1.RenderWindow;
  vtkRenderWindowInteractor interActor = renWin.GetInteractor();

  vtkInteractorStyleTrackballCamera style = new
  vtkInteractorStyleTrackballCamera();

  interActor.SetInteractorStyle(style);
  iPlaneWidgetX.SetInteractor(interActor);
  iPlaneWidgetX.On();

  renWin.SetSize(500, 500);
  renWin.Render();

However, when I add this

  vtkCellDataToPointData pointData = new vtkCellDataToPointData();
  pointData.SetInput( reader.GetOutput());

and change the iPlaneWidget's input:
  iPlaneWidgetX.SetInput(pointData.GetOutput());

It does show the data, but as interpolated pointdata, which is not what I 
want.

Is the imagePlaneWidget unable to display celldata, and should I tackle this 
a different way?

Cheers,
Tom
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