[vtkusers] vtkclippolydata deal with data base

[甘建红]

hi all
       I am engaged in cardiac flow analysis, and display the vectors over ultrasound image by means of 2D plane.  now I draw a closed polygon on the image, I want to delete the vectors which located in the close polygon, or set the inner vectors to zeros. the polygon just like the bubble  mentioned at http://www.vtk.org/pipermail/vtkusers/2005-September/032021.html. I have use the frame :
 vtkImageTracerWidget  -> path  ->  vtkLinearExtrusionFilter  ->  vtkTransformPolyDataFilter  -> vtkclippolydata
   but I am failed and I am frustrated by the problem for long time. I think the drawn line lie in a plane , so I use  vtkLinearExtrusionFilter  to get 3D geometry. any pointer is appreciated.  thanks to all of you.
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