[vtkusers] Which value am I rendering here?

[Ruff]

I have a vtkStructuredPoints with 3 scalar components and i feed that into a
volume (via vtkVolumeRayCastMapper)
I also have a colortransferfunction, *but this is only possible to control
for ONE scalar value*. Still something is rendered. It does not look right,
and it is definitely not the absolute value of the "vector" in my
structuredPoints. So what is VTK doing here?



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