ConvexHullShrinkWrap
VTKExamples/Cxx/PolyData/ConvexHullShrinkWrap
Description¶
This example creates a point cloud, and a sphere larger than the point cloud which fully contains the cloud. It then "shrink wraps" the sphere onto the points. This produces approximately a convex hull.
Code¶
ConvexHullShrinkWrap.cxx
#include <vtkSmartPointer.h> #include <vtkPolyData.h> #include <vtkSphereSource.h> #include <vtkPointSource.h> #include <vtkSmoothPolyDataFilter.h> #include <vtkXMLPolyDataWriter.h> int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetRadius(10); sphereSource->SetPhiResolution(50); sphereSource->SetThetaResolution(50); sphereSource->Update(); vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(40); pointSource->SetRadius(2); pointSource->Update(); { vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); writer->SetFileName("input.vtp"); writer->SetInputConnection(sphereSource->GetOutputPort()); writer->Write(); } { vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); writer->SetFileName("points.vtp"); writer->SetInputConnection(pointSource->GetOutputPort()); writer->Write(); } vtkSmartPointer<vtkSmoothPolyDataFilter> smoothFilter = vtkSmartPointer<vtkSmoothPolyDataFilter>::New(); smoothFilter->SetInputConnection(0, sphereSource->GetOutputPort()); smoothFilter->SetInputConnection(1, pointSource->GetOutputPort()); smoothFilter->Update(); vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New(); writer->SetFileName("output.vtp"); writer->SetInputConnection(smoothFilter->GetOutputPort()); writer->Write(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ConvexHullShrinkWrap) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ConvexHullShrinkWrap MACOSX_BUNDLE ConvexHullShrinkWrap.cxx) target_link_libraries(ConvexHullShrinkWrap ${VTK_LIBRARIES})
Download and Build ConvexHullShrinkWrap¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ConvexHullShrinkWrap and its CMakeLists.txt file. Once the tarball ConvexHullShrinkWrap.tar has been downloaded and extracted,
cd ConvexHullShrinkWrap/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:
./ConvexHullShrinkWrap
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.