SelectionSource
VTKExamples/Cxx/Filtering/SelectionSource
Code¶
SelectionSource.cxx
#include <vtkPointSource.h> #include <vtkExtractSelection.h> #include <vtkPolyData.h> #include <vtkSelectionNode.h> // for POINT and INDICES enum values #include <vtkSelectionSource.h> #include <vtkSmartPointer.h> int main(int, char *[]) { // Note - this generates 50 points and a single poly-vertex cell. vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(50); pointSource->Update(); std::cout << "There are " << pointSource->GetOutput()->GetNumberOfPoints() << " input points." << std::endl; vtkSmartPointer<vtkSelectionSource> selectionSource = vtkSmartPointer<vtkSelectionSource>::New(); selectionSource->SetFieldType(vtkSelectionNode::POINT); selectionSource->SetContentType(vtkSelectionNode::INDICES); // Without this line, all points are passed through because the 11 points // we will select below are some of the points of the poly-vertex created // by the PointSource, so the cell (by default) gets passed through since // it contains some selected points, so therefore all of the points // (the 50 belonging to the poly-vertex) also get passed through, which // is not what we are trying to demonstrate. selectionSource->SetContainingCells(false); for (vtkIdType i = 10; i <= 20; i++) { selectionSource->AddID(0, i); } selectionSource->Update(); vtkSmartPointer<vtkExtractSelection> extractSelection = vtkSmartPointer<vtkExtractSelection>::New(); extractSelection->SetInputConnection(0, pointSource->GetOutputPort()); extractSelection->SetInputConnection(1, selectionSource->GetOutputPort()); extractSelection->Update(); vtkDataSet* ds = vtkDataSet::SafeDownCast (extractSelection->GetOutput()); std::cout << "There are " << ds->GetNumberOfPoints() << " output points." << std::endl; return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(SelectionSource) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(SelectionSource MACOSX_BUNDLE SelectionSource.cxx) target_link_libraries(SelectionSource ${VTK_LIBRARIES})
Download and Build SelectionSource¶
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 Some tarballs may be missing or out-of-date.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 SelectionSource and its CMakeLists.txt file. Once the tarball SelectionSource.tar has been downloaded and extracted,
cd SelectionSource/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:
./SelectionSource
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.