[vtkusers] Glyph coloring by vector magnitud

[Sebastian Gatzka]

Hello World.

Meanwhile I made some nice glyphs, but am stuck with the coloring.
I switched on SetColorModeToColorByVector() which may be the coloring by 
vector magnitude?

vtkGlyph3D *glyph = vtkGlyph3D::New();
glyph->SetInput(gridCellCenters->GetOutput());
glyph->SetSourceConnection(arrow->GetOutputPort());
glyph->SetScaleModeToDataScalingOff();
glyph->SetColorModeToColorByScale();
glyph->SetScaleFactor(0.3);

Unfortunately all glyphs are colored the same (blue).
Do I have to do anything further to get propper coloring? Maybe with the 
mapper?

See you. Sebastian
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