[vtkusers] Is there a way to check data before using vtkBooleanOperationPolyDataFilter?

[ftouvet]

I checked the normals of the two models and there it was: the first had all
its normals pointing outward while the second had it pointing inward...
I tried the two solutions: all normals pointing inward gives non-correct
results, all pointing outward does.

I changed also most of the parameters of my vtkPolyDataNormals, which were
useless in my case.
Here is the effective pipeline:

	#Poly1 = polydata with normals pointing outward

	# Smooth the polyData
	smoothf0 = vtkSmoothPolyDataFilter()
	smoothf0.SetInput(poly1) 
	smoothf0.Update() 

	# Conversion to Triangles
	trif0 = vtk.vtkTriangleFilter()
	trif0.SetInput(smoothf0.GetOutput())
	trif0.PassVertsOff()
	trif0.PassLinesOff()
	trif0.Update()

	# Recompute Normals
	normalf0 = vtk.vtkPolyDataNormals()
	normalf0.SetInput(trif0.GetOutput())
	normalf0.ComputePointNormalsOn()
	normalf0.ComputeCellNormalsOff()
	normalf0.SplittingOff()
	normalf0.ConsistencyOn()
	normalf0.AutoOrientNormalsOff() 
	normalf0.Update()


	#Poly2 = polydata with normals pointing inward

	# Smooth the polyData
	smoothf1 = vtkSmoothPolyDataFilter()
	smoothf1.SetInput(poly2) 
	smoothf1.Update() 

	# Remove Duplicate points/unused points/degenerate cells
	cleanf1 = vtk.vtkCleanPolyData()
	cleanf1.SetInput(smoothf1.GetOutput())
	cleanf1.ConvertStripsToPolysOn()
	cleanf1.ConvertPolysToLinesOn()
	cleanf1.ConvertLinesToPointsOn()
	cleanf1.Update()

	# Conversion to Triangles
	trif1 = vtk.vtkTriangleFilter()
	trif1.SetInput(cleanf1.GetOutput())
	trif1.PassVertsOff()
	trif1.PassLinesOff()
	trif1.Update()

	# Recompute Normals
	normalf1 = vtk.vtkPolyDataNormals()
	normalf1.SetInput(trif1.GetOutput())
	normalf1.ComputePointNormalsOn()
	normalf1.ComputeCellNormalsOff()
	normalf1.SplittingOff()
	normalf1.ConsistencyOn()
	normalf1.FlipNormalsOn() # must be outward!
	normalf1.AutoOrientNormalsOff() 
	normalf1.Update()

	# Treatment

	# Design Boolean operation. Operation = 0,1,2 for Union; Intersection,
Difference
	boolFilter = vtk.vtkBooleanOperationPolyDataFilter()
	boolFilter.SetOperation(Operation)
	boolFilter.SetInput(0,normalf0.GetOutput());
	boolFilter.SetInput(1,normalf1.GetOutput());
	boolFilter.Update()





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