MiscCellData
VTKExamples/Cxx/PolyData/MiscCellData
Description¶
This demo attaches a double to a cell (triangle) in a polydata.
Code¶
MiscCellData.cxx
#include <vtkVersion.h> #include <vtkCellData.h> #include <vtkSmartPointer.h> #include <vtkCellArray.h> #include <vtkDoubleArray.h> #include <vtkTriangle.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkXMLPolyDataWriter.h> int main(int, char *[]) { // We will write the resulting file to Test.vtp so it can be inspected in Paraview std::string outputFilename = "output.vtp"; // Setup 3 points vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(1.0, 0.0, 0.0); points->InsertNextPoint(0.0, 0.0, 0.0); points->InsertNextPoint(0.0, 1.0, 0.0); // Create a triangle vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New(); triangle->GetPointIds()->SetId(0,0); triangle->GetPointIds()->SetId(1,1); triangle->GetPointIds()->SetId(2,2); // Add the triangle to a cell array vtkSmartPointer<vtkCellArray> triangles = vtkSmartPointer<vtkCellArray>::New(); triangles->InsertNextCell(triangle); // Setup data for the triangle. Attach a value of 1.45. // This can be anything you wish to store with it) vtkSmartPointer<vtkDoubleArray> triangleData = vtkSmartPointer<vtkDoubleArray>::New(); triangleData->SetNumberOfComponents(1); //we will have only 1 value associated with the triangle triangleData->SetName("TriangleData"); //set the name of the value triangleData->InsertNextValue(1.45); //set the actual value // Create a polydata that contains the points, // the triangle on those points, and the data // array (value) we created for the triangle vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); polydata->SetPoints(points); polydata->SetPolys(triangles); polydata->GetCellData()->AddArray(triangleData); // Write the file vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); #if VTK_MAJOR_VERSION <= 5 writer->SetInput(polydata); #else writer->SetInputData(polydata); #endif writer->SetFileName(outputFilename.c_str()); writer->Write(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(MiscCellData) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(MiscCellData MACOSX_BUNDLE MiscCellData.cxx) target_link_libraries(MiscCellData ${VTK_LIBRARIES})
Download and Build MiscCellData¶
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 MiscCellData and its CMakeLists.txt file. Once the tarball MiscCellData.tar has been downloaded and extracted,
cd MiscCellData/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:
./MiscCellData
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.