MergePoints
vtk-examples/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.
Question
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Code¶
MergePoints.cxx
#include <vtkMath.h>
#include <vtkMergePoints.h>
#include <vtkNew.h>
#include <vtkPointSource.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
int main(int, char*[])
{
// Create a set of points
vtkNew<vtkPointSource> pointsSource;
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
vtkNew<vtkMergePoints> mergePoints;
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 3.3 FATAL_ERROR)
project(MergePoints)
find_package(VTK COMPONENTS
vtkCommonCore
vtkCommonDataModel
vtkFiltersSources
QUIET
)
if (NOT VTK_FOUND)
message("Skipping MergePoints: ${VTK_NOT_FOUND_MESSAGE}")
return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE})
add_executable(MergePoints MACOSX_BUNDLE MergePoints.cxx )
target_link_libraries(MergePoints PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(MergePoints MACOSX_BUNDLE MergePoints.cxx )
target_link_libraries(MergePoints PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS MergePoints
MODULES ${VTK_LIBRARIES}
)
endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.