# BooleanOperationPolyDataFilter

VTKExamples/Cxx/PolyData/BooleanOperationPolyDataFilter

### Description¶

The vtkBooleanOperationPolyDataFilter works best with "clean" data, so this examples first runs vtkTriangleFilter and then vtkCleanPolyData.

This example can be run in three ways:

1. BooleanOperationPolyDataFilter - Computes the intersection of two spheres

2. BooleanOperationPolyDataFilter intersection|difference|union - Computes the intersection(difference or union) of two spheres

3. BooleanOperationPolyDataFilter input1.vtk intersection|difference|union input2.vtk - Computes the intersection(difference or union) of two vtkPolyData's

Seealso

LoopBooleanPolyDataFilter uses an alternative algorithm to do the boolean operations.

Other Languages

See (Python)

Question

### Code¶

BooleanOperationPolyDataFilter.cxx

#include <vtkSmartPointer.h>
#include <vtkBooleanOperationPolyDataFilter.h>

#include <vtkCleanPolyData.h>
#include <vtkTriangleFilter.h>
#include <vtkActor.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkNamedColors.h>

#include <vtkSphereSource.h>
#include <vtksys/SystemTools.hxx>

#include <vtkCamera.h>
namespace
{
void PositionCamera(vtkSmartPointer<vtkRenderer> &renderer,
double *viewUp,
double *position);
}

int main(int argc, char *argv[])
{
vtkSmartPointer<vtkPolyData> input1;
vtkSmartPointer<vtkPolyData> input2;

std::string operation("intersection");

if (argc == 4)
{
vtkSmartPointer<vtkPolyData> poly1;
vtkSmartPointer<vtkTriangleFilter> tri1 =
vtkSmartPointer<vtkTriangleFilter>::New();
tri1->SetInputData(poly1);
vtkSmartPointer<vtkCleanPolyData> clean1 =
vtkSmartPointer<vtkCleanPolyData>::New();
clean1->SetInputConnection(tri1->GetOutputPort());
clean1->Update();
input1 = clean1->GetOutput();

vtkSmartPointer<vtkPolyData> poly2;
vtkSmartPointer<vtkTriangleFilter> tri2 =
vtkSmartPointer<vtkTriangleFilter>::New();
tri2->SetInputData(poly2);
tri2->Update();
vtkSmartPointer<vtkCleanPolyData> clean2 =
vtkSmartPointer<vtkCleanPolyData>::New();
clean2->SetInputConnection(tri2->GetOutputPort());
clean2->Update();
input2 = clean2->GetOutput();
operation = argv[2];
}
else
{
vtkSmartPointer<vtkSphereSource> sphereSource1 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource1->SetCenter(.25, 0, 0);
sphereSource1->SetPhiResolution(21);
sphereSource1->SetThetaResolution(21);
sphereSource1->Update();
input1 = sphereSource1->GetOutput();

vtkSmartPointer<vtkSphereSource> sphereSource2 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource2->Update();
input2 = sphereSource2->GetOutput();

if (argc == 2)
{
operation = argv[1];
}
}

vtkSmartPointer<vtkNamedColors> colors =
vtkSmartPointer<vtkNamedColors>::New();

vtkSmartPointer<vtkPolyDataMapper> input1Mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
input1Mapper->SetInputData( input1 );
input1Mapper->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> input1Actor =
vtkSmartPointer<vtkActor>::New();
input1Actor->SetMapper( input1Mapper );
input1Actor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Tomato").GetData());
input1Actor->GetProperty()->SetSpecular(.6);
input1Actor->GetProperty()->SetSpecularPower(20);
input1Actor->SetPosition(
input1->GetBounds()[1]-input1->GetBounds()[0],
0, 0);
vtkSmartPointer<vtkPolyDataMapper> input2Mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
input2Mapper->SetInputData( input2 );
input2Mapper->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> input2Actor =
vtkSmartPointer<vtkActor>::New();
input2Actor->SetMapper( input2Mapper );
input2Actor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Mint").GetData());
input2Actor->GetProperty()->SetSpecular(.6);
input2Actor->GetProperty()->SetSpecularPower(20);
input2Actor->SetPosition(
-(input1->GetBounds()[1]-input1->GetBounds()[0]),
0, 0);
vtkSmartPointer<vtkBooleanOperationPolyDataFilter> booleanOperation =
vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
if (operation == "union")
{
booleanOperation->SetOperationToUnion();
}
else if (operation == "intersection")
{
booleanOperation->SetOperationToIntersection();
}
else if (operation == "difference")
{
booleanOperation->SetOperationToDifference();
}
else
{
std::cout << "Unknown operation: " << operation << std::endl;
return EXIT_FAILURE;
}
booleanOperation->SetInputData( 0, input1 );
booleanOperation->SetInputData( 1, input2 );

vtkSmartPointer<vtkPolyDataMapper> booleanOperationMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
booleanOperationMapper->SetInputConnection( booleanOperation->GetOutputPort() );
booleanOperationMapper->ScalarVisibilityOff();

vtkSmartPointer<vtkActor> booleanOperationActor =
vtkSmartPointer<vtkActor>::New();
booleanOperationActor->SetMapper( booleanOperationMapper );
booleanOperationActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Banana").GetData());
booleanOperationActor->GetProperty()->SetSpecular(.6);
booleanOperationActor->GetProperty()->SetSpecularPower(20);

vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->SetBackground(colors->GetColor3d("Silver").GetData());
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(640, 480);
double viewUp[3] = {0.0, 0.0, 1.0};
double position[3] = {0.0, -1.0, 0.0};
PositionCamera(renderer, viewUp, position);
renderer->GetActiveCamera()->Dolly(1.5);
renderer->ResetCameraClippingRange();

vtkSmartPointer<vtkRenderWindowInteractor> renWinInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renWinInteractor->SetRenderWindow( renderWindow );

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

return EXIT_SUCCESS;
}
namespace
{
{
vtkSmartPointer<vtkPolyData> polyData;
std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
if (extension == ".ply")
{
}
else if (extension == ".vtp")
{
}
else if (extension == ".obj")
{
}
else if (extension == ".stl")
{
}
else if (extension == ".vtk")
{
}
else if (extension == ".g")
{
}
else
{
vtkSmartPointer<vtkSphereSource> source =
vtkSmartPointer<vtkSphereSource>::New();
source->Update();
polyData = source->GetOutput();
}
return polyData;
}

void PositionCamera(vtkSmartPointer<vtkRenderer> &renderer,
double *viewUp,
double *position)
{
renderer->GetActiveCamera()->SetFocalPoint(0.0, 0.0, 0.0);
renderer->GetActiveCamera()->SetViewUp(viewUp);
renderer->GetActiveCamera()->SetPosition(position);
renderer->ResetCamera();
return;
}
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BooleanOperationPolyDataFilter)

find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkFiltersCore
vtkFiltersGeneral
vtkIOGeometry
vtkIOLegacy
vtkIOPLY
vtkIOXML
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping BooleanOperationPolyDataFilter: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION:${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE}) add_executable(BooleanOperationPolyDataFilter MACOSX_BUNDLE BooleanOperationPolyDataFilter.cxx ) target_link_libraries(BooleanOperationPolyDataFilter PRIVATE${VTK_LIBRARIES})
else ()
# include all components
target_link_libraries(BooleanOperationPolyDataFilter PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS BooleanOperationPolyDataFilter MODULES${VTK_LIBRARIES}
)
endif ()


cd BooleanOperationPolyDataFilter/build


If VTK is installed:

cmake ..


If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..


Build the project:

make


and run it:

./BooleanOperationPolyDataFilter


WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.