[vtkusers] *****SPAM***** how to limit vector arrow inside outline

[Gong Ding]

Hi,
I am using vtkGlyph3D to create vector plot with arrow source.
However, I found that the boundary point has arrows out of the outline box,
which made the plot not so beautiful. 
(The arrow tail is located at the mesh point, the head of arrow is out of box)
screen shot is attached here.

Does anyone have an idea how to clip the plot inside outline box?

Gong Ding
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