PointOccupancy
VTKExamples/Cxx/Points/PointOccupancy
Description¶
Warning
The classes used in this example require vtk 7.1 or later.
Code¶
PointOccupancy.cxx
#include <vtkSmartPointer.h> #include <vtkPointSource.h> #include <vtkPLYReader.h> #include <vtkSTLReader.h> #include <vtkXMLPolyDataReader.h> #include <vtkOBJReader.h> #include <vtkPointOccupancyFilter.h> #include <vtkThreshold.h> #include <vtkDataSetMapper.h> #include <vtkImageData.h> #include <vtkNamedColors.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] : "");; int dimension = 128; vtkSmartPointer<vtkPointOccupancyFilter> occupancy = vtkSmartPointer<vtkPointOccupancyFilter>::New(); occupancy->SetInputData(polyData); occupancy->SetSampleDimensions(dimension, dimension, dimension); occupancy->SetOccupiedValue(255); occupancy->Update(); vtkSmartPointer<vtkThreshold> threshold = vtkSmartPointer<vtkThreshold>::New(); threshold->SetInputConnection(occupancy->GetOutputPort()); threshold->ThresholdByUpper(255); threshold->AllScalarsOff(); vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New(); mapper->SetInputConnection(threshold->GetOutputPort()); mapper->ScalarVisibilityOff(); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Colors vtkSmartPointer<vtkNamedColors> nc = vtkSmartPointer<vtkNamedColors>::New(); double flesh[3]; nc->GetColorRGB("moccasin", flesh); actor->GetProperty()->SetColor(flesh); // 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(actor); // Generate an interesting view // ren1->ResetCamera(); ren1->GetActiveCamera()->Azimuth(120); ren1->GetActiveCamera()->Elevation(30); ren1->GetActiveCamera()->Dolly(1.25); 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(1000); 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(PointOccupancy) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(PointOccupancy MACOSX_BUNDLE PointOccupancy.cxx) target_link_libraries(PointOccupancy ${VTK_LIBRARIES})
Download and Build PointOccupancy¶
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 PointOccupancy and its CMakeLists.txt file. Once the tarball PointOccupancy.tar has been downloaded and extracted,
cd PointOccupancy/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:
./PointOccupancy
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.