[vtkusers] vtkBooleanOperationPolyDataFilter on multiple objects: resut depends on intersection order

[Michele Conconi]

Hi everybody,

I am playing with this new class vtkBooleanOperationPolyDataFilter (to the
developer: great job!)

I am tring to intersect multiple objects. Anyway the result I get can be
affected from the order I choose for the subsequent intersections. In
particular, some order wrong polydata containing disconnected faces. I guess
it is a problem similar to the one proposed by Eric Fahlgren, for wich I
found no suggested solution
(http://vtk.1045678.n5.nabble.com/vtkBooleanOperationPolyDataFilter-including-disconnected-faces-td5161564.html).

Thanks in advance for any hint.
Cheers

Michele

Here are the stl files I used

http://vtk.1045678.n5.nabble.com/file/n5714450/obj1.stl  obj1.stl
http://vtk.1045678.n5.nabble.com/file/n5714450/obj2.stl  obj2.stl
http://vtk.1045678.n5.nabble.com/file/n5714450/obj3.stl  obj3.stl

And here is the test code

#include <vtkVersion.h>
#include <vtkBooleanOperationPolyDataFilter.h>

#include <vtkActor.h>
#include <vtkPolyDataReader.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkSTLReader.h>


int main()
{
        vtkSTLReader *Reader1 = vtkSTLReader::New();
        vtkSTLReader *Reader2 = vtkSTLReader::New();
        vtkSTLReader *Reader3 = vtkSTLReader::New();

        Reader1->SetFileName("obj1.stl");
        Reader2->SetFileName("obj2.stl");
        Reader3->SetFileName("obj3.stl");


        vtkSmartPointer<vtkBooleanOperationPolyDataFilter> booleanOperation =
vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
        vtkSmartPointer<vtkBooleanOperationPolyDataFilter> booleanOperation2 =
vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();

     booleanOperation->SetOperationToIntersection();
        booleanOperation2->SetOperationToIntersection();


        //WORKING INTERSECTION ORDER

        booleanOperation->SetInput( 0, Reader1->GetOutput() );
        booleanOperation->SetInput( 1, Reader3->GetOutput() );

        booleanOperation2->SetInput( 0, booleanOperation->GetOutput() );
        booleanOperation2->SetInput( 1, Reader2->GetOutput() );


        //ALTERNATIVE NOT WORKING INTERSECTION ORDERS

        // -------- 1 ------------
        //booleanOperation->SetInput( 0, Reader1->GetOutput() );
        //booleanOperation->SetInput( 1, Reader2->GetOutput() );

        //booleanOperation2->SetInput( 0, booleanOperation->GetOutput() );
        //booleanOperation2->SetInput( 1, Reader3->GetOutput() );

        // -------- 2 ----------
        //booleanOperation->SetInput( 0, Reader2->GetOutput() );
        //booleanOperation->SetInput( 1, Reader3->GetOutput() );

        //booleanOperation2->SetInput( 0, booleanOperation->GetOutput() );
        //booleanOperation2->SetInput( 1, Reader1->GetOutput() );


        vtkSmartPointer<vtkPolyDataMapper> booleanOperationMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
        vtkSmartPointer<vtkActor> booleanOperationActor =
vtkSmartPointer<vtkActor>::New();
        vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
        vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
        vtkSmartPointer<vtkRenderWindowInteractor> renWinInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();

        booleanOperationMapper->SetInputConnection(
booleanOperation2->GetOutputPort() );
        booleanOperationMapper->ScalarVisibilityOff();

        booleanOperationActor->SetMapper( booleanOperationMapper );

        renderer->AddViewProp(booleanOperationActor);
        renderer->SetBackground(.1, .2, .3);

        renderWindow->AddRenderer( renderer );

        renWinInteractor->SetRenderWindow( renderWindow );

        renderWindow->Render();
        renWinInteractor->Start();

        return EXIT_SUCCESS;
}



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