[vtkusers] Specifying the radius of a Polygon-source in pixel coordinates ?

[Oliver Kania]

Hello all,
One can specify the radius of a vtkRegularPolygonSource
in world coordinates. However, this can make the markers
look non-uniform on the per-pixel level if one uses a glyph3D.
I guess this happens when world values are transformed
into actual pixel values.

I cannot use a Glyph2D or a PolyDataMapper2D in my case
Here is some code:

m_markersource = vtkRegularPolygonSource::New();
m_markersource->SetNumberOfSides(4);
m_markersource->SetGeneratePolygon(0);
m_markersource->SetRadius(radius-in-world-coordinates)

m_markerglyphs = vtkGlyph3D::New();
m_markerglyphs->SetSource(m_markersource->GetOutput());

Best regards,
Oliver
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