[vtkusers] getbounds() problem

[ѧ־ Ñî]

Hi, I use getbounds() method to bound vtkPolyData with bounding box BBox[6], 
for two vtkPolyData object, detect intersection of two bounding box, but it 
returns 0 which on the view(surface) the two object does intersect. Do I 
need to do anything to get it right? Really struggle with this since it 
looks very simple but don't know where is the problem. : ( thank you for any 
help

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