[vtkusers] how to get the other part from vtkclipclosedsurface

[sdpkrshnn]

Hi, 
 I am Cutting a mesh using vtkClipClosedSurface but it is always keeping one
part and i need get the other part which is cropped ,my code is here below

quad = vtk.vtkSTLReader()
quad.SetFileName(vtkFile)
quad.Update()
mesh = quad.GetOutput()

clipPlane = vtk.vtkPlane() 
clipPlane.SetOrigin(0,0,-54.3772147817)
clipPlane.SetNormal(0,0,1)

centerFilter = vtk.vtkCenterOfMass()
centerFilter.SetInput(mesh)
centerFilter.SetUseScalarsAsWeights(False)
centerFilter.Update()
center = centerFilter.GetCenter()
print center

transform = vtk.vtkTransform()
transform.Translate(-center[0], -center[1], -center[2])
transformFilter = vtk.vtkTransformPolyDataFilter()
transformFilter.SetInput(mesh)
transformFilter.SetTransform(transform)
transformFilter.Update()
centeredPolydata = transformFilter.GetOutput()

clip = vtk.vtkClipClosedSurface()
clip.SetInputConnection(transformFilter.GetOutputPort())
planes = vtk.vtkPlaneCollection()
planes.AddItem(clipPlane)
clip.SetTolerance(10e-3)
clip.SetClippingPlanes(planes)
clip.Update()
mesh = clip.GetOutput()

polyWriter = vtk.vtkSTLWriter()
polyWriter.SetInput(mesh)
polyWriter.SetFileName(vtkfile)
polyWriter.Write()

Can any one suggest any dolution





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