ContoursFromPolyData
VTKExamples/Cxx/Filtering/ContoursFromPolyData
Description¶
This example uses vtkCutter to generate contours from a PolyData. A vtkPlane is set at the center of the PolyData and several contours are generated by specifying contour values that are distances to the center plane. The example works with a filename if provided. Otherwise is uses a vtkSphereSource.
Code¶
ContoursFromPolyData.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkXMLPolyDataReader.h> #include <vtkSphereSource.h> #include <vtkPolyDataMapper.h> #include <vtkPlane.h> #include <vtkCutter.h> #include <vtkProperty.h> #include <vtkActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkMath.h> int main(int argc, char *argv[]) { vtkSmartPointer<vtkPolyData> inputPolyData; if(argc > 1) { vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); reader->SetFileName(argv[1]); reader->Update(); inputPolyData = reader->GetOutput(); } else { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetThetaResolution(30); sphereSource->SetPhiResolution(15); sphereSource->Update(); inputPolyData = sphereSource->GetOutput(); } vtkSmartPointer<vtkPolyDataMapper> inputMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 inputMapper->SetInput(inputPolyData); #else inputMapper->SetInputData(inputPolyData); #endif // Create a plane to cut vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New(); plane->SetOrigin(inputPolyData->GetCenter()); plane->SetNormal(1,1,1); double minBound[3]; minBound[0] = inputPolyData->GetBounds()[0]; minBound[1] = inputPolyData->GetBounds()[2]; minBound[2] = inputPolyData->GetBounds()[4]; double maxBound[3]; maxBound[0] = inputPolyData->GetBounds()[1]; maxBound[1] = inputPolyData->GetBounds()[3]; maxBound[2] = inputPolyData->GetBounds()[5]; double center[3]; center[0] = inputPolyData->GetCenter()[0]; center[1] = inputPolyData->GetCenter()[1]; center[2] = inputPolyData->GetCenter()[2]; double distanceMin = sqrt(vtkMath::Distance2BetweenPoints(minBound, center)); double distanceMax = sqrt(vtkMath::Distance2BetweenPoints(maxBound, center)); // Create cutter vtkSmartPointer<vtkCutter> cutter = vtkSmartPointer<vtkCutter>::New(); cutter->SetCutFunction(plane); #if VTK_MAJOR_VERSION <= 5 cutter->SetInput(inputPolyData); #else cutter->SetInputData(inputPolyData); #endif cutter->GenerateValues(20, -distanceMin, distanceMax); vtkSmartPointer<vtkPolyDataMapper> cutterMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); cutterMapper->SetInputConnection( cutter->GetOutputPort()); cutterMapper->ScalarVisibilityOff(); // Create plane actor vtkSmartPointer<vtkActor> planeActor = vtkSmartPointer<vtkActor>::New(); planeActor->GetProperty()->SetColor(1.0,1,0); planeActor->GetProperty()->SetLineWidth(3); planeActor->SetMapper(cutterMapper); // Create input actor vtkSmartPointer<vtkActor> inputActor = vtkSmartPointer<vtkActor>::New(); inputActor->GetProperty()->SetColor(1.0, 0.8941, 0.7686); // bisque inputActor->SetMapper(inputMapper); // Create renderers and add actors of plane and cube vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(planeActor); //display the rectangle resulting from the cut renderer->AddActor(inputActor); //display the cube //Add renderer to renderwindow and render vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); renderWindow->SetSize(600, 600); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); renderer->SetBackground(.1, .2, .3); renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ContoursFromPolyData) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ContoursFromPolyData MACOSX_BUNDLE ContoursFromPolyData.cxx) target_link_libraries(ContoursFromPolyData ${VTK_LIBRARIES})
Download and Build ContoursFromPolyData¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ContoursFromPolyData and its CMakeLists.txt file. Once the tarball ContoursFromPolyData.tar has been downloaded and extracted,
cd ContoursFromPolyData/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:
./ContoursFromPolyData
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.