[vtkusers] VTK7.1: render points as spheres does not work when coloring by cell data

[lp]

Hello, 

I am playing around with the new feature in vtk7.1 to render edges and
vertices as tubes and spheres (as described in
https://blog.kitware.com/rendering-tubes-and-spheres-in-vtk/). 

This is a very nice feature, but I have found one issue: When the mapper is
set to color by cellData (mapper->SetScalarModeToUseCellData()), only the
edges are shown as tubes but the spheres at the vertices are not rendered.
For SetScalarModeToUsePointData it works as expected (both, tubes and
spheres are rendered). 

So my question: Is it possible to show the vertex spheres, when coloring by
cellData? 

Example code (based on VTK Sphere example) attached. 

Regards, 
Lukas 

CMakeLists.txt
<http://vtk.1045678.n5.nabble.com/file/n5741121/CMakeLists.txt>  
Sphere.cxx <http://vtk.1045678.n5.nabble.com/file/n5741121/Sphere.cxx>  



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