ReverseSense
VTKExamples/Cxx/PolyData/ReverseSense
Code
ReverseSense.cxx
#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkPointData.h>
#include <vtkReverseSense.h>
#include <vtkFloatArray.h>
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkFloatArray> pointNormals =
vtkFloatArray::SafeDownCast(sphereSource->GetOutput()->GetPointData()->GetNormals());
std::cout << std::endl << "Normals: " << std::endl;
// Display the first few normals
for(unsigned int i = 0; i < 5; i++)
{
double pN[3];
pointNormals->GetTuple(i, pN);
std::cout << "Point normal " << i << ": " << pN[0] << " " << pN[1] << " " << pN[2] << std::endl;
}
vtkSmartPointer<vtkReverseSense> reverseSense =
vtkSmartPointer<vtkReverseSense>::New();
reverseSense->SetInputConnection(sphereSource->GetOutputPort());
reverseSense->ReverseNormalsOn();
reverseSense->Update();
vtkSmartPointer<vtkFloatArray> reversedNormals =
vtkFloatArray::SafeDownCast(reverseSense->GetOutput()->GetPointData()->GetNormals());
std::cout << std::endl << "Reversed: " << std::endl;
// Display the first few normals to verify that they are flipped
for(unsigned int i = 0; i < 5; i++)
{
double pN[3];
reversedNormals->GetTuple(i, pN);
std::cout << "Reversed normal " << i << ": " << pN[0] << " " << pN[1] << " " << pN[2] << std::endl;
}
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ReverseSense)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ReverseSense MACOSX_BUNDLE ReverseSense.cxx)
target_link_libraries(ReverseSense ${VTK_LIBRARIES})
Download and Build ReverseSense
Click here to download ReverseSense and its CMakeLists.txt file. Once the tarball ReverseSense.tar has been downloaded and extracted,
cd ReverseSense/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:
./ReverseSense
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.