AppendFilter
VTKExamples/Cxx/Filtering/AppendFilter
Description¶
This example loads points into a polydata and an unstructured grid then combines them.
The example should be extended to show cells being combined as well.
Code¶
AppendFilter.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkActor.h> #include <vtkAppendFilter.h> #include <vtkDataSetMapper.h> #include <vtkPointSource.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkUnstructuredGrid.h> int main(int, char *[]) { // Create 5 points (vtkPolyData) vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(5); pointSource->Update(); vtkSmartPointer<vtkPolyData> polydata = pointSource->GetOutput(); std::cout << "There are " << polydata->GetNumberOfPoints() << " points in the polydata." << std::endl; // Create 2 points in a vtkUnstructuredGrid vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(0,0,0); points->InsertNextPoint(0,0,1); vtkSmartPointer<vtkUnstructuredGrid> ug = vtkSmartPointer<vtkUnstructuredGrid>::New(); ug->SetPoints(points); std::cout << "There are " << ug->GetNumberOfPoints() << " points in the unstructured grid." << std::endl; // Combine the two data sets vtkSmartPointer<vtkAppendFilter> appendFilter = vtkSmartPointer<vtkAppendFilter>::New(); #if VTK_MAJOR_VERSION <= 5 appendFilter->AddInput(polydata); appendFilter->AddInput(ug); #else appendFilter->AddInputData(polydata); appendFilter->AddInputData(ug); #endif appendFilter->Update(); vtkSmartPointer<vtkUnstructuredGrid> combined = appendFilter->GetOutput(); std::cout << "There are " << combined->GetNumberOfPoints() << " points combined." << std::endl; // Create a mapper and actor vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New(); mapper->SetInputConnection(appendFilter->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetPointSize(5); // Create a renderer, render window, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Add the actor to the scene renderer->AddActor(actor); renderer->SetBackground(.2, .3, .4); // Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(AppendFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(AppendFilter MACOSX_BUNDLE AppendFilter.cxx) target_link_libraries(AppendFilter ${VTK_LIBRARIES})
Download and Build AppendFilter¶
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 AppendFilter and its CMakeLists.txt file. Once the tarball AppendFilter.tar has been downloaded and extracted,
cd AppendFilter/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:
./AppendFilter
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.