VTK/Examples/Cxx/Filtering/ImplicitBoolean

ImplicitBoolean.cxx

#include <vtkSmartPointer.h>
#include <vtkSampleFunction.h>
#include <vtkContourFilter.h>
#include <vtkOutlineFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkImageData.h>
#include <vtkImplicitBoolean.h>
 
#include <vtkSphere.h>
 
int main (int, char *[])
{
  vtkSmartPointer<vtkSphere> sphere1 = 
    vtkSmartPointer<vtkSphere>::New();
  sphere1->SetCenter(.9,0,0);
  vtkSmartPointer<vtkSphere> sphere2 = 
    vtkSmartPointer<vtkSphere>::New();
  sphere2->SetCenter(-.9,0,0);
 
  vtkSmartPointer<vtkImplicitBoolean> implicitBoolean =
    vtkSmartPointer<vtkImplicitBoolean>::New();
  implicitBoolean->AddFunction(sphere1);
  implicitBoolean->AddFunction(sphere2);
  implicitBoolean->SetOperationTypeToUnion();
  //implicitBoolean->SetOperationTypeToIntersection();
 
  // Sample the function
  vtkSmartPointer<vtkSampleFunction> sample = 
    vtkSmartPointer<vtkSampleFunction>::New();
  sample->SetSampleDimensions(50,50,50);
  sample->SetImplicitFunction(implicitBoolean);
  double value = 3.0;
  double xmin = -value, xmax = value,
    ymin = -value, ymax = value,
    zmin = -value, zmax = value;
  sample->SetModelBounds(xmin, xmax, ymin, ymax, zmin, zmax);
 
  // Create the 0 isosurface
  vtkSmartPointer<vtkContourFilter> contours = 
    vtkSmartPointer<vtkContourFilter>::New();
  contours->SetInputConnection(sample->GetOutputPort());
  contours->GenerateValues(1, 1, 1);
 
  // Map the contours to graphical primitives
  vtkSmartPointer<vtkPolyDataMapper> contourMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  contourMapper->SetInputConnection(contours->GetOutputPort());
  contourMapper->ScalarVisibilityOff();
 
  // Create an actor for the contours
  vtkSmartPointer<vtkActor> contourActor = 
    vtkSmartPointer<vtkActor>::New();
  contourActor->SetMapper(contourMapper);
 
  // Visualize
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  renderer->AddActor(contourActor);
  renderer->SetBackground(.2, .3, .4);
 
  renderWindow->Render();
  interactor->Start();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(ImplicitBoolean)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(ImplicitBoolean MACOSX_BUNDLE ImplicitBoolean.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(ImplicitBoolean ${VTK_LIBRARIES})
else()
  target_link_libraries(ImplicitBoolean vtkHybrid vtkWidgets)
endif()

Download and Build ImplicitBoolean

Click here to download ImplicitBoolean. and its CMakeLists.txt file.

Once the tarball ImplicitBoolean.tar has been downloaded and extracted,

cd ImplicitBoolean/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:

./ImplicitBoolean

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