Generates a bar-like surface
start: np.ndarray :
3-elemtent vector indicating top part of the bar
stop: np.ndarray :
3-elemtent vector indicating bottom side of the bar
radius: float :
radius of the bar
poly: int :
the top and bottom part will be a regular polygon.
bar: surf.Surface :
A surface with poly*2+2 vertices and poly*4 faces
mvpa2.support.nibabel.surf.from_any
mvpa2.support.nibabel.surf.generate_cube
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