NullPoint
VTKExamples/Cxx/PolyData/NullPoint
Code
NullPoint.cxx
#include <vtkPoints.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkFloatArray.h>
int main(int, char *[])
{
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(1,1,1);
points->InsertNextPoint(2,2,2);
points->InsertNextPoint(3,3,3);
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
vtkSmartPointer<vtkFloatArray> floatArray =
vtkSmartPointer<vtkFloatArray>::New();
floatArray->SetNumberOfValues(3);
floatArray->SetNumberOfComponents(1);
floatArray->SetName("FloatArray");
for(vtkIdType i = 0; i < 3; i++)
{
floatArray->SetValue(i,2);
}
polydata->GetPointData()->AddArray(floatArray);
vtkSmartPointer<vtkIntArray> intArray =
vtkSmartPointer<vtkIntArray>::New();
intArray->SetNumberOfValues(3);
intArray->SetNumberOfComponents(1);
intArray->SetName("IntArray");
for(vtkIdType i = 0; i < 3; i++)
{
intArray->SetValue(i,2);
}
polydata->GetPointData()->AddArray(intArray);
for(vtkIdType i = 0; i < 3; i++)
{
double p[3];
polydata->GetPoint(i,p);
vtkFloatArray* pointsFloatArray = vtkFloatArray::SafeDownCast(polydata->GetPointData()->GetArray("FloatArray"));
vtkIntArray* pointsIntArray = vtkIntArray::SafeDownCast(polydata->GetPointData()->GetArray("IntArray"));
std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " " << p[2] << " "
<< pointsFloatArray->GetValue(i) << " " << pointsIntArray->GetValue(i) << std::endl;
}
polydata->GetPointData()->NullPoint(1);
polydata->Modified();
for(vtkIdType i = 0; i < 3; i++)
{
double p[3];
polydata->GetPoint(i,p);
vtkFloatArray* pointsFloatArray = vtkFloatArray::SafeDownCast(polydata->GetPointData()->GetArray("FloatArray"));
vtkIntArray* pointsIntArray = vtkIntArray::SafeDownCast(polydata->GetPointData()->GetArray("IntArray"));
std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " " << p[2] << " "
<< pointsFloatArray->GetValue(i) << " " << pointsIntArray->GetValue(i) << std::endl;
}
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(NullPoint)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(NullPoint MACOSX_BUNDLE NullPoint.cxx)
target_link_libraries(NullPoint ${VTK_LIBRARIES})
Download and Build NullPoint
Click here to download NullPoint and its CMakeLists.txt file. Once the tarball NullPoint.tar has been downloaded and extracted,
cd NullPoint/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:
./NullPoint
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.