[vtkusers] vtkBooleanOperationPolyDataFilter: SetOperationToDifference gives me strange results

[Miguel Sotaquira]

Hi everyone,

I'm trying to compute an XOR boolean operation between two NON manifold
surfaces (see figure http://shareimage.org/images/3s5diyk1oypdib5fvx80.png).
The surface A is the white one (top panel of previous figure) and the
surface B is the red one (bottom panel). B is simply a region extracted
from A using vtkExtractPolyDataGeometry.

Now I want to compute a boolean XOR between A and B in order to get C: the
green colored surface. I'm using vtkBooleanOperationPolyDataFilter:

vtkSmartPointer<vtkBooleanOperationPolyDataFilter> boolean
= vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
boolean->SetOperationToDifference();
boolean->SetInput(0,meshA);
boolean->SetInput(1,meshB);
boolean->Update();

vtkPolyData* meshC = boolean->GetOutput();

However, when using this approach I obtain a surface like this (the blue
one): http://shareimage.org/images/gva77uyrmog4n2j1ndo.png;  that clearly
is not the expected XOR operation.

I know I'm not using manifold surfaces (as explicitly required
by vtkBooleanOperationPolyDataFilter) so I don't know if that's why I'm
getting these results. If so, is there another way of computing this XOR
operation?

Thanks,
Miguel
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