MatrixMathFilter
VTKExamples/Cxx/Meshes/MatrixMathFilter
Code¶
MatrixMathFilter.cxx
#include <vtkSmartPointer.h> #include <vtkPointData.h> #include <vtkSphereSource.h> #include <vtkMatrixMathFilter.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkUnstructuredGridReader.h> #include <vtkDataSetSurfaceFilter.h> #include <vtkXMLUnstructuredGridWriter.h> #include <vtkXMLPolyDataWriter.h> int main(int argc, char *argv[]) { if(argc < 2) { std::cerr << "Required arguments: vtkFile" << std::endl; return EXIT_FAILURE; } std::string filename = argv[1]; // "/Data/tensors.vtk"; std::cout << "filename: " << filename << std::endl; vtkSmartPointer<vtkUnstructuredGridReader> reader = vtkSmartPointer<vtkUnstructuredGridReader>::New(); reader->SetFileName(filename.c_str()); reader->Update(); vtkSmartPointer<vtkDataSetSurfaceFilter> surfaceFilter = vtkSmartPointer<vtkDataSetSurfaceFilter>::New(); surfaceFilter->SetInputConnection(reader->GetOutputPort()); surfaceFilter->Update(); vtkSmartPointer<vtkMatrixMathFilter> matrixMathFilter = vtkSmartPointer<vtkMatrixMathFilter>::New(); //matrixMathFilter->SetOperationToDeterminant(); matrixMathFilter->SetOperationToEigenvalue(); matrixMathFilter->SetInputConnection(surfaceFilter->GetOutputPort()); matrixMathFilter->Update(); matrixMathFilter->GetOutput()->GetPointData()->SetActiveScalars("Eigenvalue"); vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); writer->SetInputConnection(matrixMathFilter->GetOutputPort()); writer->SetFileName("output.vtp"); writer->Write(); // Visualize vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(matrixMathFilter->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderer->AddActor(actor); renderer->SetBackground(.3, .6, .3); // Background color green renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(MatrixMathFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(MatrixMathFilter MACOSX_BUNDLE MatrixMathFilter.cxx) target_link_libraries(MatrixMathFilter ${VTK_LIBRARIES})
Download and Build MatrixMathFilter¶
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 MatrixMathFilter and its CMakeLists.txt file. Once the tarball MatrixMathFilter.tar has been downloaded and extracted,
cd MatrixMathFilter/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:
./MatrixMathFilter
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.