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Bill Lorensen authored
A user, Rémi Blanc, reported that Visual Studio Express 2008 defines DIFFERENCE. For VTK, enum values should have a VTK_ prefix to avoid potential current and future name clashes. This patch replaces DIFFERENCE, UNION and INTERSECTION with VTK_DIFFERENCE, VTK_UNION and VTK_INTERSECTION. Applications that use the methods SetOperationToDifference, SetOperationToUnion and SetOperationToIntersection will not need to update their code. Applications that use vtkBooleanOperationPolyDataFilter::DIFFERENCE, vtkBooleanOperationPolyDataFilter::UNION or vtkBooleanOperationPolyDataFilter::INTERSECTION will need to update their code. Change-Id: I26dae4a1c36c359bbe62e070a0d372fc53ccc449
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