VectorNorm
VTKExamples/Cxx/Math/VectorNorm
Code¶
VectorNorm.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkFloatArray.h> #include <vtkPointData.h> #include <vtkVectorNorm.h> // For compatibility with new VTK generic data arrays #ifdef vtkGenericDataArray_h #define InsertNextTupleValue InsertNextTypedTuple #endif int main(int, char *[]) { vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(1,2,3); points->InsertNextPoint(4,5,6); vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); polydata->SetPoints(points); vtkSmartPointer<vtkFloatArray> distances = vtkSmartPointer<vtkFloatArray>::New(); distances->SetNumberOfComponents(3); distances->SetName("Distances"); float v1[3] = {1,2,3}; float v2[3] = {4,5,6}; distances->InsertNextTupleValue(v1); distances->InsertNextTupleValue(v2); polydata->GetPointData()->SetVectors(distances); vtkSmartPointer<vtkVectorNorm> vectorNorm = vtkSmartPointer<vtkVectorNorm>::New(); #if VTK_MAJOR_VERSION <= 5 vectorNorm->SetInputConnection(polydata->GetProducerPort()); #else vectorNorm->SetInputData(polydata); #endif vectorNorm->Update(); vtkFloatArray* scalars = vtkFloatArray::SafeDownCast ( vectorNorm->GetOutput()->GetPointData()->GetScalars() ); for(vtkIdType i = 0; i < scalars->GetNumberOfTuples(); i++) { std::cout << "Value " << i << " : " << scalars->GetValue(i) << std::endl; } return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(VectorNorm) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(VectorNorm MACOSX_BUNDLE VectorNorm.cxx) target_link_libraries(VectorNorm ${VTK_LIBRARIES})
Download and Build VectorNorm¶
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 Some tarballs may be missing or out-of-date.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 VectorNorm and its CMakeLists.txt file. Once the tarball VectorNorm.tar has been downloaded and extracted,
cd VectorNorm/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:
./VectorNorm
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.