[vtkusers] vtkBooleanOperationPolyDataFilter including disconnected faces

[Fahlgren, Eric]

http://www.lifemodeler.com/eric/badBoolean.png

Two problems, possibly related:

1) When I perform two successive Boolean operations, extraneous faces from the second solid of the final operation are left in the polydata.

2) Note the faces in the red box of the linked image.  The normals appear to be incorrect, there are occasional dark regions in odd places on the resulting polydata.

Is there a filter I can add after the Boolean operations to eliminate the extra faces?  How about straightening up the normals?

Thanks,
Eric

#!/usr/bin/env python

import vtk

LHS = vtk.vtkCubeSource()
LHS.SetCenter((0.0, 0.0, 0.8))

if 1:
   triangle = vtk.vtkTriangleFilter()
   triangle.SetInputConnection(LHS.GetOutputPort())
   LHS = triangle

if 1:
   RHS = vtk.vtkSphereSource()
   RHS.SetCenter((0.5, 0.0, 0.2))
   RHS.SetRadius(1.0); RHS.SetPhiResolution(40); RHS.SetThetaResolution(40)

   boolOp = vtk.vtkBooleanOperationPolyDataFilter()
   boolOp.SetOperation(vtk.VTK_DIFFERENCE)
   boolOp.SetInputConnection(0, LHS.GetOutputPort())
   boolOp.SetInputConnection(1, RHS.GetOutputPort())
   LHS = boolOp

if 1:
   RHS = vtk.vtkSphereSource()
   RHS.SetCenter((-0.5, 0.0, 0.3))
   RHS.SetRadius(1.0); RHS.SetPhiResolution(40); RHS.SetThetaResolution(40)

   boolOp = vtk.vtkBooleanOperationPolyDataFilter()
   boolOp.SetOperation(vtk.VTK_DIFFERENCE)
   boolOp.SetInputConnection(0, LHS.GetOutputPort())
   boolOp.SetInputConnection(1, RHS.GetOutputPort())
   LHS = boolOp

if 0:
   fill = vtk.vtkFillHolesFilter()
  #fill.SetHoleSize(1.0)
   fill.SetInputConnection(LHS.GetOutputPort())
   LHS = fill

mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(LHS.GetOutputPort(0))
mapper.ScalarVisibilityOff()

actor = vtk.vtkActor()
actor.SetMapper(mapper)

renderer = vtk.vtkRenderer()
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindow.SetSize(1024, 1024)

renderer.AddActor(actor)

interactor = vtk.vtkRenderWindowInteractor()
interactor.SetRenderWindow(renderWindow)
interactor.Initialize()
renderWindow.Render()
interactor.Start()