[vtkusers] creating colortables (and opacity) with 3 scalars, rather than 1

[Ruff]

I would like some way to rewrite the current color- and opacity settings.
I have a structuredPoints-set and I am currently using one scalar value and
the following settings for volume rendering:

opacity = vtk.vtkPiecewiseFunction()
opacity.AddPoint('scalar', 'opacity') #repeated a bunch of times
colors = vtk.vtkColorTransferFunction()
colors.AddRGBPoint('scalar','red','green','blue') #repeated a bunch of times

(the opacity and colors goes into ->vtkVolumeProperty->vtkVolume)
Is there some easy way to rewrite this so I can color structuredPoints with
3 scalars in it?



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