Fix multi-components (RGBA) in volume representation.
Check the state of MapScalars (indep. components) when updating vector mode since vtkVolumeMapper uses internal single-component data in MAGNITUDE mode.
Fixes #17862 (closed)
Check the state of MapScalars (indep. components) when updating vector mode since vtkVolumeMapper uses internal single-component data in MAGNITUDE mode.
Fixes #17862 (closed)