[vtkusers] How can i point a 3D point by cylinder source

[Arindam]

Hi,

I am showing my 3D point with 3d glyphing with spare source. And i want 
to point the points by cylinder source.But by each translation the point 
is showing at the middle of cylinder source.But i want it to come at the 
tip and it should point vertically .Please help me for doing this.
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