[vtkusers] VolumeRayCastMapper for a RectilinearGrid?

[Amy Squillacote]

Hi Bernard,

VTK can volume render datasets of type vtkImageData or 
vtkUnstructedGrid. You'll need to convert your dataset to one of these 
two types if you want to raycast it.

- Amy

Bernard Giroux wrote:
> I cannot figure out how to use ray casting to render a 
> vtkRectilinearGrid.  Is there a mapper for this type vtkDataSet?
>
>
>
> The following java code yields the error message
>
> ERROR: In 
> /usr/local/vtk-5.0.2/VTK/VolumeRendering/vtkVolumeMapper.cxx, line 83
> vtkVolumeRayCastMapper (0x1f1423c0): The SetInput method of this 
> mapper requires vtkImageData as input
>
>
>
>
> private void buildDensityVtkVolume() {
>     updateOpacityTransferFunction();
>     updateColorTransferFunction();
>     vtkVolumeProperty volumeProperty = new vtkVolumeProperty();
>     volumeProperty.SetColor(colorTransferFunction);
>     volumeProperty.SetScalarOpacity(opacityTransferFunction);
>
>     vtkVolumeRayCastCompositeFunction compositeFunction = new 
> vtkVolumeRayCastCompositeFunction();
>     vtkVolumeRayCastMapper volumeMapper = new vtkVolumeRayCastMapper();
>     volumeMapper.SetVolumeRayCastFunction(compositeFunction);
>     volumeMapper.SetInput(BHGraviGUI.currentProject.getComplexEarthModel() 
>
>                 .getVtkDataSet());
>
>     densityVolume = new vtkVolume();
>     densityVolume.SetMapper(volumeMapper);
>     densityVolume.SetProperty(volumeProperty);
> }
>
> Here,
> BHGraviGUI.currentProject.getComplexEarthModel().getVtkDataSet()
>
> return a vtkRectilinearGrid
>
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