MergePoints
VTKExamples/Cxx/PolyData/MergePoints
Description
Add new points if they are unique. You must add the original points first. After that, the locator will only add unique points.
Code
MergePoints.cxx
#include <vtkSmartPointer.h>
#include <vtkMath.h>
#include <vtkMergePoints.h>
#include <vtkPointSource.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
int main(int, char *[])
{
// Create a set of points
vtkSmartPointer<vtkPointSource> pointsSource =
vtkSmartPointer<vtkPointSource>::New();
pointsSource->SetNumberOfPoints(100);
pointsSource->Update();
vtkPolyData* points = pointsSource->GetOutput();
// Get a point point in the set
double inSet[3];
points->GetPoint(25, inSet);
std::cout << "There are "
<< points->GetNumberOfPoints() << " input points." << std::endl;
vtkIdType id;
// Insert all of the points
vtkSmartPointer<vtkMergePoints> mergePoints =
vtkSmartPointer<vtkMergePoints>::New();
mergePoints->SetDataSet(points);
mergePoints->SetDivisions(10,10,10);
mergePoints->InitPointInsertion(points->GetPoints(), points->GetBounds());
for (vtkIdType i = 0; i < points->GetNumberOfPoints(); i++)
{
mergePoints->InsertUniquePoint(points->GetPoint(i), id);
}
// Insert a few of the original points
std::cout << "Insert some of the original points" << std::endl;
int inserted;
for (vtkIdType i = 0; i < points->GetNumberOfPoints(); i+=10)
{
points->GetPoint(i, inSet);
inserted = mergePoints->InsertUniquePoint(inSet, id);
std::cout << "\tPoint: "
<< inSet[0] << ", "
<< inSet[1] << ", "
<< inSet[2] << " ";
std::cout << "Inserted? " << ((inserted == 0) ? "No, " : "Yes, ");
std::cout << "Id:: " << id << std::endl;
}
// These points are probably outside the original set of points
std::cout << "Insert some new points" << std::endl;
double outsideSet[3];
for (unsigned int i = 0; i < 10; i++)
{
outsideSet[0] = vtkMath::Random(
-pointsSource->GetRadius(),
pointsSource->GetRadius());
outsideSet[1] = vtkMath::Random(
-pointsSource->GetRadius(),
pointsSource->GetRadius());
outsideSet[2] = vtkMath::Random(
-pointsSource->GetRadius(),
pointsSource->GetRadius());
inserted = mergePoints->InsertUniquePoint(outsideSet, id);
std::cout << "\tPoint: "
<< outsideSet[0] << ", "
<< outsideSet[1] << ", "
<< outsideSet[2] << " ";
std::cout << "Inserted? " << ((inserted == 0) ? "No, " : "Yes, ");
std::cout << "Id:: " << id << std::endl;
}
std::cout << "There are now "
<< points->GetNumberOfPoints() << " points." << std::endl;
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(MergePoints)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(MergePoints MACOSX_BUNDLE MergePoints.cxx)
target_link_libraries(MergePoints ${VTK_LIBRARIES})
Download and Build MergePoints
Click here to download MergePoints and its CMakeLists.txt file. Once the tarball MergePoints.tar has been downloaded and extracted,
cd MergePoints/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:
./MergePoints
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.