MergeSelections
VTKExamples/Cxx/PolyData/MergeSelections
Description¶
- Fixed by Mirko Heuegger
Question
If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum
Code¶
MergeSelections.cxx
#include <vtkActor.h> #include <vtkDataSetMapper.h> #include <vtkExtractSelection.h> #include <vtkIdTypeArray.h> #include <vtkInformation.h> #include <vtkPointSource.h> #include <vtkPolyData.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSelection.h> #include <vtkSelectionNode.h> #include <vtkSmartPointer.h> #include <vtkUnstructuredGrid.h> int main(int, char *[]) { vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(50); pointSource->Update(); std::cout << "There are " << pointSource->GetOutput()->GetNumberOfPoints() << " input points." << std::endl; vtkSmartPointer<vtkIdTypeArray> ids1 = vtkSmartPointer<vtkIdTypeArray>::New(); ids1->SetNumberOfComponents(1); // Set values for(unsigned int i = 10; i < 20; i++) { ids1->InsertNextValue(i); } vtkSmartPointer<vtkIdTypeArray> ids2 = vtkSmartPointer<vtkIdTypeArray>::New(); ids2->SetNumberOfComponents(1); for(unsigned int i = 15; i < 30; i++) { ids2->InsertNextValue(i); } vtkSmartPointer<vtkSelectionNode> selectionNode1 = vtkSmartPointer<vtkSelectionNode>::New(); selectionNode1->SetFieldType(vtkSelectionNode::POINT); selectionNode1->SetContentType(vtkSelectionNode::INDICES); selectionNode1->SetSelectionList(ids1); vtkSmartPointer<vtkSelectionNode> selectionNode2 = vtkSmartPointer<vtkSelectionNode>::New(); selectionNode2->SetFieldType(vtkSelectionNode::POINT); selectionNode2->SetContentType(vtkSelectionNode::INDICES); selectionNode2->SetSelectionList(ids2); vtkSmartPointer<vtkSelection> selection1 = vtkSmartPointer<vtkSelection>::New(); selection1->AddNode(selectionNode1); vtkSmartPointer<vtkSelection> selection2 = vtkSmartPointer<vtkSelection>::New(); selection2->AddNode(selectionNode2); vtkSmartPointer<vtkSelection> selectionCombined = vtkSmartPointer<vtkSelection>::New(); selectionCombined->AddNode(selectionNode1); selectionCombined->Union(selectionNode2); std::cout << "There are " << selectionCombined->GetNumberOfNodes() << " nodes." << std::endl; vtkSmartPointer<vtkExtractSelection> extractSelection1 = vtkSmartPointer<vtkExtractSelection>::New(); extractSelection1->SetInputConnection(0, pointSource->GetOutputPort()); extractSelection1->SetInputData(1, selection1); extractSelection1->Update(); vtkSmartPointer<vtkExtractSelection> extractSelection2 = vtkSmartPointer<vtkExtractSelection>::New(); extractSelection2->SetInputConnection(0, pointSource->GetOutputPort()); extractSelection2->SetInputData(1, selection2); extractSelection2->Update(); vtkSmartPointer<vtkExtractSelection> extractSelectionCombined = vtkSmartPointer<vtkExtractSelection>::New(); extractSelectionCombined->SetInputConnection(0, pointSource->GetOutputPort()); extractSelectionCombined->SetInputData(1, selectionCombined); extractSelectionCombined->Update(); // In selection vtkDataSet* ds = dynamic_cast<vtkDataSet*>(extractSelectionCombined->GetOutput()); std::cout << "There are " << ds->GetNumberOfPoints() << " points in the selection." << std::endl; std::cout << "There are " << ds->GetNumberOfCells() << " cells in the selection." << std::endl; /* // Not in selection selectionNode1->GetProperties()->Set(vtkSelectionNode::INVERSE(), 1); //invert the selection selectionNode2->GetProperties()->Set(vtkSelectionNode::INVERSE(), 1); //invert the selection extractSelection->Update(); std::cout << "There are " << dynamic_cast<vtkDataSet*> (extractSelection->GetOutput())->GetNumberOfPoints() << " points not in the selection." << std::endl; */ // Visualize vtkSmartPointer<vtkDataSetMapper> mapperOriginal = vtkSmartPointer<vtkDataSetMapper>::New(); mapperOriginal->SetInputConnection(pointSource->GetOutputPort()); mapperOriginal->ScalarVisibilityOff(); vtkSmartPointer<vtkDataSetMapper> mapper1 = vtkSmartPointer<vtkDataSetMapper>::New(); mapper1->SetInputConnection(extractSelection1->GetOutputPort()); mapper1->ScalarVisibilityOff(); vtkSmartPointer<vtkDataSetMapper> mapper2 = vtkSmartPointer<vtkDataSetMapper>::New(); mapper2->SetInputConnection(extractSelection2->GetOutputPort()); mapper2->ScalarVisibilityOff(); vtkSmartPointer<vtkDataSetMapper> mapperCombined = vtkSmartPointer<vtkDataSetMapper>::New(); mapperCombined->SetInputConnection(extractSelectionCombined->GetOutputPort()); mapperCombined->ScalarVisibilityOff(); vtkSmartPointer<vtkActor> originalActor = vtkSmartPointer<vtkActor>::New(); originalActor->SetMapper(mapperOriginal); vtkSmartPointer<vtkActor> actor1 = vtkSmartPointer<vtkActor>::New(); actor1->SetMapper(mapper1); vtkSmartPointer<vtkActor> actor2 = vtkSmartPointer<vtkActor>::New(); actor2->SetMapper(mapper2); vtkSmartPointer<vtkActor> actorCombined = vtkSmartPointer<vtkActor>::New(); actorCombined->SetMapper(mapperCombined); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(1000,250); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); double originalViewport[4] = {0.0, 0.0, 0.25, 1.0}; double selection1Viewport[4] = {0.25, 0.0, 0.5, 1.0}; double selection2Viewport[4] = {0.5, 0.0, 0.75, 1.0}; double selectionCombinedViewport[4] = {0.75, 0.0, 1.0, 1.0}; vtkSmartPointer<vtkRenderer> originalRenderer = vtkSmartPointer<vtkRenderer>::New(); originalRenderer->SetViewport(originalViewport); vtkSmartPointer<vtkRenderer> selection1Renderer = vtkSmartPointer<vtkRenderer>::New(); selection1Renderer->SetViewport(selection1Viewport); vtkSmartPointer<vtkRenderer> selection2Renderer = vtkSmartPointer<vtkRenderer>::New(); selection2Renderer->SetViewport(selection2Viewport); vtkSmartPointer<vtkRenderer> selectionCombinedRenderer = vtkSmartPointer<vtkRenderer>::New(); selectionCombinedRenderer->SetViewport(selectionCombinedViewport); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(selection1Renderer); renderWindow->AddRenderer(selection2Renderer); renderWindow->AddRenderer(selectionCombinedRenderer); originalRenderer->AddActor(originalActor); selection1Renderer->AddActor(actor1); selection2Renderer->AddActor(actor2); selectionCombinedRenderer->AddActor(actorCombined); //renderer->SetBackground(1,1,1); // Background color white renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(MergeSelections) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersExtraction vtkFiltersSources vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping MergeSelections: ${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(MergeSelections MACOSX_BUNDLE MergeSelections.cxx ) target_link_libraries(MergeSelections PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(MergeSelections MACOSX_BUNDLE MergeSelections.cxx ) target_link_libraries(MergeSelections PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS MergeSelections MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build MergeSelections¶
Click here to download MergeSelections and its CMakeLists.txt file. Once the tarball MergeSelections.tar has been downloaded and extracted,
cd MergeSelections/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:
./MergeSelections
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.