BooleanOperationImplicitFunctions

VTKExamples/Cxx/ImplicitFunctions/BooleanOperationImplicitFunctions


Question

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Code

BooleanOperationImplicitFunctions.cxx

#include <vtkSphere.h>
#include <vtkBox.h>
#include <vtkImplicitBoolean.h>
#include <vtkSampleFunction.h>
#include <vtkContourFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkNamedColors.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCamera.h>
#include <vtkProperty.h>
#include <vtkColor.h>

int main(int argc, char *argv[])
{
  // Define colors
  auto colors =
    vtkSmartPointer<vtkNamedColors>::New();
  vtkColor3d actorColor = colors->GetColor3d("AliceBlue");
  vtkColor3d  EdgeColour = colors->GetColor3d("SteelBlue");
  vtkColor3d BackgroundColour = colors->GetColor3d("Silver");

  // create a sphere
  auto sphere =
    vtkSmartPointer<vtkSphere>::New();
  sphere->SetCenter(1.0, 0.0, 0.0);
  sphere->SetRadius(1);

  //create a box
  auto box =
    vtkSmartPointer<vtkBox>::New();
  box->SetBounds(-1, 1, -1, 1, -1, 1);

  // combine the two implicit functions
  auto boolean =
    vtkSmartPointer<vtkImplicitBoolean>::New();
  boolean->SetOperationTypeToDifference();
  // boolean->SetOperationTypeToUnion()
  // boolean->SetOperationTypeToIntersection()
  boolean->AddFunction(box);
  boolean->AddFunction(sphere);
  //The sample function generates a distance function from the implicit
  //function.This is then contoured to get a polygonal surface.
  auto sample =
    vtkSmartPointer<vtkSampleFunction>::New();
  sample->SetImplicitFunction(boolean);
  sample->SetModelBounds(-1, 2, -1, 1, -1, 1);
  sample->SetSampleDimensions(40, 40, 40);
  sample->ComputeNormalsOff();

  // contour
  auto surface =
    vtkSmartPointer<vtkContourFilter>::New();
  surface->SetInputConnection(sample->GetOutputPort());
  surface->SetValue(0, 0.0);

  //Create a mapper and an actor
  auto mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(surface->GetOutputPort());
  mapper->ScalarVisibilityOff();
  auto actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->EdgeVisibilityOn();
  actor->GetProperty()->SetColor(actorColor.GetData());
  actor->GetProperty()->SetEdgeColor(EdgeColour.GetData());

  // A renderer and render window
  auto renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderer->SetBackground(BackgroundColour.GetData());
  auto renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  auto renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
  //add the actor
  renderer->AddActor(actor);
  // Start
  renderer->GetActiveCamera()->SetPosition(5.0, -4.0, 1.6);
  renderer->GetActiveCamera()->SetViewUp(0.1, 0.5, 0.9);
  renderer->GetActiveCamera()->SetDistance(6.7);
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BooleanOperationImplicitFunctions)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonDataModel
  vtkFiltersCore
  vtkImagingHybrid
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping BooleanOperationImplicitFunctions: ${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(BooleanOperationImplicitFunctions MACOSX_BUNDLE BooleanOperationImplicitFunctions.cxx )
  target_link_libraries(BooleanOperationImplicitFunctions PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(BooleanOperationImplicitFunctions MACOSX_BUNDLE BooleanOperationImplicitFunctions.cxx )
  target_link_libraries(BooleanOperationImplicitFunctions PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS BooleanOperationImplicitFunctions
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build BooleanOperationImplicitFunctions

Click here to download BooleanOperationImplicitFunctions and its CMakeLists.txt file. Once the tarball BooleanOperationImplicitFunctions.tar has been downloaded and extracted,

cd BooleanOperationImplicitFunctions/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:

./BooleanOperationImplicitFunctions

WINDOWS USERS

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