DataStructureComparison
VTKExamples/Cxx/DataStructures/DataStructureComparison
Description¶
Prior to August 20, 2010, the vtkModifiedBSPTree.cxx did not produce a proper data representation. To operate properly, update your vtk source tree.
Use the 'n' key (for 'N'ext) and the 'p' key (for 'P'revious) to navigate the levels of the trees.
Code¶
DataStructureComparison.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkPointSource.h> #include <vtkObjectFactory.h> #include <vtkRendererCollection.h> #include <vtkPolyData.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkPolyDataMapper.h> #include <vtkXMLPolyDataReader.h> #include <vtkSphereSource.h> #include <vtkProperty.h> #include <vtkCamera.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkKdTreePointLocator.h> #include <vtkOctreePointLocator.h> #include <vtkOBBTree.h> #include <vtkModifiedBSPTree.h> #include <vector> class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera { public: static KeyPressInteractorStyle* New(); vtkSmartPointer<vtkPolyData> data; std::vector<vtkRenderer*> renderers; std::vector<vtkSmartPointer<vtkLocator> > trees; std::vector<vtkSmartPointer<vtkPolyDataMapper> > mappers; std::vector<vtkSmartPointer<vtkActor> > actors; vtkSmartPointer<vtkPolyDataMapper> meshMapper; vtkSmartPointer<vtkActor> meshActor; void Initialize() { #if VTK_MAJOR_VERSION <= 5 this->meshMapper->SetInputConnection(this->data->GetProducerPort()); #else this->meshMapper->SetInputData(this->data); #endif for(unsigned int i = 0; i < 4; i++) { vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); this->mappers.push_back(mapper); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetRepresentationToWireframe(); this->actors.push_back(actor); this->renderers[i]->AddActor(actor); this->renderers[i]->AddActor(meshActor); } this->Level = 1; std::cout << "Level = " << this->Level << std::endl; this->ReDraw(); } KeyPressInteractorStyle() { this->Level = 1; vtkSmartPointer<vtkLocator> tree0 = vtkSmartPointer<vtkKdTreePointLocator>::New(); this->trees.push_back(tree0); vtkSmartPointer<vtkLocator> tree1 = vtkSmartPointer<vtkOBBTree>::New(); this->trees.push_back(tree1); vtkSmartPointer<vtkLocator> tree2 = vtkSmartPointer<vtkOctreePointLocator>::New(); this->trees.push_back(tree2); vtkSmartPointer<vtkLocator> tree3 = vtkSmartPointer<vtkModifiedBSPTree>::New(); this->trees.push_back(tree3); this->meshMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); this->meshActor = vtkSmartPointer<vtkActor>::New(); this->meshActor->SetMapper(this->meshMapper); } virtual void OnChar() { char ch = this->Interactor->GetKeyCode() ; switch (ch) { case 'n': this->Level++; break; case 'p': if(this->Level > 1) { this->Level--; } break ; default: std::cout << "An unhandled key was pressed." << std::endl; break; } this->ReDraw(); // forward events if(ch != 'p') //don't forward the "pick" command { vtkInteractorStyleTrackballCamera::OnChar(); } } void ReDraw() { std::cout << "Level " << this->Level << std::endl; for(unsigned i = 0; i < 4; i++) { vtkSmartPointer<vtkLocator> tree = this->trees[i]; //vtkRenderer* renderer = this->renderers[i]; tree->SetDataSet(data); tree->BuildLocator(); vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); std::cout << "Tree " << i << " has " << tree->GetLevel() << " levels." << std::endl; if(this->Level > tree->GetLevel()) { tree->GenerateRepresentation(tree->GetLevel(), polydata); } else { tree->GenerateRepresentation(this->Level, polydata); } #if VTK_MAJOR_VERSION <= 5 this->mappers[i]->SetInputConnection(polydata->GetProducerPort()); #else this->mappers[i]->SetInputData(polydata); #endif } this->Interactor->GetRenderWindow()->Render(); } private: int Level; }; vtkStandardNewMacro(KeyPressInteractorStyle); int main(int argc, char *argv[]) { vtkSmartPointer<vtkPolyData> originalMesh = vtkSmartPointer<vtkPolyData>::New(); if(argc > 1) //If a file name is specified, open and use the file. { vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); reader->SetFileName(argv[1]); reader->Update(); originalMesh->ShallowCopy(reader->GetOutput()); } else //If a file name is not specified, create a sphere { //vtkSmartPointer<vtkSphereSource> sphereSource = //vtkSmartPointer<vtkSphereSource>::New(); vtkSmartPointer<vtkPointSource> sphereSource = vtkSmartPointer<vtkPointSource>::New(); sphereSource->SetNumberOfPoints(1000); sphereSource->Update(); originalMesh->ShallowCopy(sphereSource->GetOutput()); } double numberOfViewports = 4.; vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(200* numberOfViewports,200); //(width, height) renderWindow->SetWindowName("Multiple ViewPorts"); vtkSmartPointer<KeyPressInteractorStyle> style = vtkSmartPointer<KeyPressInteractorStyle>::New(); style->data = originalMesh; vtkSmartPointer<vtkCamera> camera = vtkSmartPointer<vtkCamera>::New(); for(unsigned int i = 0; i < 4; i++) { vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(renderer); style->renderers.push_back(renderer); renderer->SetViewport(static_cast<double>(i)/numberOfViewports,0, static_cast<double>(i+1)/numberOfViewports,1); renderer->SetBackground(.2, .3, .4); renderer->SetActiveCamera(camera); } vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->SetInteractorStyle(style); style->Initialize(); style->renderers[0]->ResetCamera(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(DataStructureComparison) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(DataStructureComparison MACOSX_BUNDLE DataStructureComparison.cxx) target_link_libraries(DataStructureComparison ${VTK_LIBRARIES})
Download and Build DataStructureComparison¶
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 DataStructureComparison and its CMakeLists.txt file. Once the tarball DataStructureComparison.tar has been downloaded and extracted,
cd DataStructureComparison/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:
./DataStructureComparison
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.