[vtkusers] My point cloud data won't display in the renderer.

[Ruff]

All i get is an empty renderWindow. I get no errors, but no data is rendered
either. What am I doing wrong?

What I do is pretty much this:

AtomGrid=vtk.vtkUnstructuredGrid()
AtomGrid.SetPoints(    vtkPoints with [index,x,y,z]    )
AtomGrid.GetPointData().SetScalars(    vtkFloatArray with [index, scalar]   
)

volMapper = vtk.vtkUnstructuredGridVolumeRayCastMapper()
volMapper.SetBlendModeToComposite()
volMapper.SetInput(AtomGrid)


I tried volMapper.SetScalarModeToUsePointFieldData(), but then it claims
that I have no scalar values to use(!!)

(I cheated before, and was satisfied using ImageData for this, but now I
really need to get this to work with UnstructuredGrid)



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