[vtkusers] problem wirh vtkImagePlaneWidget

[455535440]

hello everyone：
  I want to use vtkImagePlaneWidget to get a slice from a 3D actor,
so i used the method GetResliceOutput, I thinked this method can get the slice that cut by the plane. But it didn't work , the slice the method returned was not the slice the plane cut, actrally  it returned the slice we see on the screen! like: when I move the actor presented the 3D image, but I did't move the plane, the slice woule be different.
anyone know how to get the slice cut by the plane?
  thx~~~
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