DensifyPoints
VTKExamples/Cxx/Points/DensifyPoints
Description¶
In this example, the original points are yellow and the added points are red.
The image was produced using this torso dataset
Code¶
DensifyPoints.cxx
#include <vtkSmartPointer.h> #include <vtkDensifyPointCloudFilter.h> #include <vtkPLYReader.h> #include <vtkXMLPolyDataReader.h> #include <vtkOBJReader.h> #include <vtkSTLReader.h> #include <vtkPointSource.h> #include <vtkSphereSource.h> #include <vtkGlyph3D.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkCamera.h> #include <vtksys/SystemTools.hxx> static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName); int main (int argc, char *argv[]) { vtkSmartPointer<vtkPolyData> polyData = ReadPolyData(argc > 1 ? argv[1] : "");; double bounds[6]; polyData->GetBounds(bounds); double range[3]; for (int i = 0; i < 3; ++i) { range[i] = bounds[2*i + 1] - bounds[2*i]; } std::cout << "Range: " << range[0] << ", " << range[1] << ", " << range[2] << std::endl; std::cout << "# of original points: " << polyData->GetNumberOfPoints() << std::endl; vtkSmartPointer<vtkDensifyPointCloudFilter> densify = vtkSmartPointer<vtkDensifyPointCloudFilter>::New(); densify->SetInputData(polyData); densify->SetMaximumNumberOfIterations(5); densify->SetTargetDistance(range[0] * .03); densify->SetNumberOfClosestPoints(10); densify->Update(); std::cout << "# of densified points: " << densify->GetOutput()->GetNumberOfPoints() << std::endl; /// double radius = range[0] * .01; vtkSmartPointer<vtkSphereSource> sphereSource1 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource1->SetRadius(radius); vtkSmartPointer<vtkGlyph3D> glyph3D1 = vtkSmartPointer<vtkGlyph3D>::New(); glyph3D1->SetInputData(polyData); glyph3D1->SetSourceConnection(sphereSource1->GetOutputPort()); glyph3D1->ScalingOff(); glyph3D1->Update(); vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper1 = vtkSmartPointer<vtkPolyDataMapper>::New(); glyph3DMapper1->SetInputConnection(glyph3D1->GetOutputPort()); glyph3DMapper1->ScalarVisibilityOff(); vtkSmartPointer<vtkActor> glyph3DActor1 = vtkSmartPointer<vtkActor>::New(); glyph3DActor1->SetMapper(glyph3DMapper1); glyph3DActor1->GetProperty()->SetColor(0.8900, 0.8100, 0.3400); //// vtkSmartPointer<vtkSphereSource> sphereSource2 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource2->SetRadius(radius * .75); vtkSmartPointer<vtkGlyph3D> glyph3D2 = vtkSmartPointer<vtkGlyph3D>::New(); glyph3D2->SetInputConnection(densify->GetOutputPort()); glyph3D2->SetSourceConnection(sphereSource2->GetOutputPort()); glyph3D2->ScalingOff(); glyph3D2->Update(); vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper2 = vtkSmartPointer<vtkPolyDataMapper>::New(); glyph3DMapper2->SetInputConnection(glyph3D2->GetOutputPort()); glyph3DMapper2->ScalarVisibilityOff(); vtkSmartPointer<vtkActor> glyph3DActor2 = vtkSmartPointer<vtkActor>::New(); glyph3DActor2->SetMapper(glyph3DMapper2); glyph3DActor2->GetProperty()->SetColor(1.0000, 0.4900, 0.2500); // Create graphics stuff // vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New(); ren1->SetBackground(.3, .4, .6); vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New(); renWin->AddRenderer(ren1); renWin->SetSize(512,512); vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New(); iren->SetRenderWindow(renWin); // Add the actors to the renderer, set the background and size // ren1->AddActor(glyph3DActor1); ren1->AddActor(glyph3DActor2); // Generate an interesting view // ren1->GetActiveCamera()->SetPosition (1, 0, 0); ren1->GetActiveCamera()->SetFocalPoint (0, 1, 0); ren1->GetActiveCamera()->SetViewUp (0, 0, 1); ren1->ResetCamera(); ren1->GetActiveCamera()->Dolly(1.0); ren1->ResetCameraClippingRange(); iren->Initialize(); iren->Start(); return EXIT_SUCCESS; } static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName) { vtkSmartPointer<vtkPolyData> polyData; std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName)); if (extension == ".ply") { vtkSmartPointer<vtkPLYReader> reader = vtkSmartPointer<vtkPLYReader>::New(); reader->SetFileName (fileName); reader->Update(); polyData = reader->GetOutput(); } else if (extension == ".vtp") { vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); reader->SetFileName (fileName); reader->Update(); polyData = reader->GetOutput(); } else if (extension == ".obj") { vtkSmartPointer<vtkOBJReader> reader = vtkSmartPointer<vtkOBJReader>::New(); reader->SetFileName (fileName); reader->Update(); polyData = reader->GetOutput(); } else if (extension == ".stl") { vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New(); reader->SetFileName (fileName); reader->Update(); polyData = reader->GetOutput(); } else { vtkSmartPointer<vtkPointSource> points = vtkSmartPointer<vtkPointSource>::New(); points->SetNumberOfPoints(100000); points->SetRadius(10.0); points->SetCenter(vtkMath::Random(-100, 100), vtkMath::Random(-100, 100), vtkMath::Random(-100, 100)); points->SetDistributionToShell(); points->Update(); polyData = points->GetOutput(); } return polyData; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(DensifyPoints) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(DensifyPoints MACOSX_BUNDLE DensifyPoints.cxx) target_link_libraries(DensifyPoints ${VTK_LIBRARIES})
Download and Build DensifyPoints¶
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 DensifyPoints and its CMakeLists.txt file. Once the tarball DensifyPoints.tar has been downloaded and extracted,
cd DensifyPoints/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:
./DensifyPoints
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.