[vtkusers] display arrows on a surface mesh

[Zhangyuanchao]

Hi, there,
 
I would like to display arrows on a closed surface mesh. Given that the the arrows may point inside and outside the surface, I can see the arrows pointing outside the surface using vtkGlyph3D and vtkArrowSource. However, the arrows pointing inside is not visable. How can I pull out the arrows pointing inside?
 
Is there any function by which I can chang the role between the start point  and end point of an arrow?
or How can I manage to solve the problem? Is there any other way?
 
Thanks a lot!
 
yuanchao 


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