CenterOfMass
vtk-examples/Cxx/PolyData/CenterOfMass
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Code¶
CenterOfMass.cxx
#include <vtkCenterOfMass.h>
#include <vtkDoubleArray.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <cmath>
#include <limits>
int main(int, char*[])
{
// Create a point set of a square
vtkNew<vtkPoints> points;
points->InsertNextPoint(0, 0, 0);
points->InsertNextPoint(1, 0, 0);
points->InsertNextPoint(0, 1, 0);
points->InsertNextPoint(1, 1, 0);
vtkNew<vtkPolyData> polydata;
polydata->SetPoints(points);
// Compute the center of mass
vtkNew<vtkCenterOfMass> centerOfMassFilter;
centerOfMassFilter->SetInputData(polydata);
centerOfMassFilter->SetUseScalarsAsWeights(false);
centerOfMassFilter->Update();
double center[3];
centerOfMassFilter->GetCenter(center);
std::cout << "Center of mass is " << center[0] << " " << center[1] << " "
<< center[2] << std::endl;
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(CenterOfMass)
find_package(VTK COMPONENTS
vtkCommonCore
vtkCommonDataModel
vtkFiltersCore
QUIET
)
if (NOT VTK_FOUND)
message("Skipping CenterOfMass: ${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(CenterOfMass MACOSX_BUNDLE CenterOfMass.cxx )
target_link_libraries(CenterOfMass PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(CenterOfMass MACOSX_BUNDLE CenterOfMass.cxx )
target_link_libraries(CenterOfMass PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS CenterOfMass
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build CenterOfMass¶
Click here to download CenterOfMass and its CMakeLists.txt file. Once the tarball CenterOfMass.tar has been downloaded and extracted,
cd CenterOfMass/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:
./CenterOfMass
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.