ReadUnstructuredGrid
VTKExamples/Cxx/IO/ReadUnstructuredGrid
Description¶
This examples demonstrates how to read an unstructured grid (VTU) file.
An example data file (.vtu) for testing can be found in VTKData/Data/quadraticTetra01.vtu.
Code¶
ReadUnstructuredGrid.cxx
#include <vtkXMLUnstructuredGridReader.h> #include <vtkSmartPointer.h> #include <vtkDataSetMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> int main ( int argc, char *argv[] ) { //parse command line arguments if(argc != 2) { std::cerr << "Usage: " << argv[0] << " Filename(.vtu)" << std::endl; return EXIT_FAILURE; } std::string filename = argv[1]; //read all the data from the file vtkSmartPointer<vtkXMLUnstructuredGridReader> reader = vtkSmartPointer<vtkXMLUnstructuredGridReader>::New(); reader->SetFileName(filename.c_str()); reader->Update(); //Create a mapper and actor vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New(); mapper->SetInputConnection(reader->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); //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(.3, .6, .3); // Background color green //Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ReadUnstructuredGrid) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ReadUnstructuredGrid MACOSX_BUNDLE ReadUnstructuredGrid.cxx) target_link_libraries(ReadUnstructuredGrid ${VTK_LIBRARIES})
Download and Build ReadUnstructuredGrid¶
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 Some tarballs may be missing or out-of-date.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 ReadUnstructuredGrid and its CMakeLists.txt file. Once the tarball ReadUnstructuredGrid.tar has been downloaded and extracted,
cd ReadUnstructuredGrid/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:
./ReadUnstructuredGrid
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.