[vtkusers] My volume won't display in the renderer.

[Ruff]

Now I can render it as point clouds, but not as a volume. All I get is an
empty renderWindow. I get no errors, but no data is rendered either. What am
I doing wrong?

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

volumeMapper = vtkUnstructuredGridVolumeRayCastMapper()
volumeMapper.SetInputConnection(ScalarGrid)
volumeMapper.SetScalarModeToUsePointData()

...etc

I tried using DataSetTriangleFilter (found in some example) but then the
program claims that Im using the "ray cast mapper without scalars!"
I rendered it as a point cloud before, with the vtkVertexGlyphFilter, but
that doesn't seem to be applicable here, though I suppose the solution has
something to do with cells here as well...



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