NormalEstimation
VTKExamples/Cxx/Points/NormalEstimation
Description¶
Warning
The classes used in this example require vtk 7.1 or later.
Question
If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum
Code¶
NormalEstimation.cxx
#include <vtkSmartPointer.h> #include <vtkPCANormalEstimation.h> #include <vtkPointSource.h> #include <vtkSphereSource.h> #include <vtkArrowSource.h> #include <vtkGlyph3D.h> #include <vtkMath.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkCamera.h> #include <vtkNamedColors.h> namespace { void MakeGlyphs(vtkPolyData *src, double size, vtkGlyph3D *glyph); } int main (int, char *[]) { vtkMath::RandomSeed(4355412); // for test result consistency double radius = 1.0; vtkSmartPointer<vtkPointSource> points = vtkSmartPointer<vtkPointSource>::New(); points->SetNumberOfPoints(1000); points->SetRadius(radius); points->SetCenter(0.0, 0.0, 0.0); points->SetDistributionToShell(); int sampleSize = 10; vtkSmartPointer<vtkPCANormalEstimation> normals = vtkSmartPointer<vtkPCANormalEstimation>::New(); normals->SetInputConnection (points->GetOutputPort()); normals->SetSampleSize(sampleSize); normals->SetNormalOrientationToGraphTraversal(); normals->Update(); vtkSmartPointer<vtkNamedColors>colors = vtkSmartPointer<vtkNamedColors>::New(); vtkSmartPointer<vtkGlyph3D> glyph3D = vtkSmartPointer<vtkGlyph3D>::New(); MakeGlyphs(normals->GetOutput(), radius * .2, glyph3D.GetPointer()); vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); glyph3DMapper->SetInputConnection(glyph3D->GetOutputPort()); vtkSmartPointer<vtkActor> glyph3DActor = vtkSmartPointer<vtkActor>::New(); glyph3DActor->SetMapper(glyph3DMapper); glyph3DActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Banana").GetData()); vtkSmartPointer<vtkSphereSource> sphere = vtkSmartPointer<vtkSphereSource>::New(); sphere->SetRadius(1.0); sphere->SetThetaResolution(41); sphere->SetPhiResolution(21); vtkSmartPointer<vtkPolyDataMapper> sphereMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); sphereMapper->SetInputConnection(sphere->GetOutputPort()); vtkSmartPointer<vtkActor> sphereActor = vtkSmartPointer<vtkActor>::New(); sphereActor->SetMapper(sphereMapper); sphereActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("Tomato").GetData()); // Create graphics stuff // vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->SetBackground(colors->GetColor3d("SlateGray").GetData()); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); renderWindow->SetSize(640, 480); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); // Add the actors to the renderer, set the background and size // renderer->AddActor(glyph3DActor); renderer->AddActor(sphereActor); // Generate an interesting view // renderer->ResetCamera(); renderer->GetActiveCamera()->Azimuth(120); renderer->GetActiveCamera()->Elevation(30); renderer->GetActiveCamera()->Dolly(1.0); renderer->ResetCameraClippingRange(); renderWindow->Render(); interactor->Initialize(); interactor->Start(); return EXIT_SUCCESS; } namespace { void MakeGlyphs(vtkPolyData *src, double size, vtkGlyph3D *glyph) { // Source for the glyph filter vtkSmartPointer<vtkArrowSource> arrow = vtkSmartPointer<vtkArrowSource>::New(); arrow->SetTipResolution(16); arrow->SetTipLength(.3); arrow->SetTipRadius(.1); glyph->SetSourceConnection(arrow->GetOutputPort()); glyph->SetInputData(src); glyph->SetVectorModeToUseNormal(); glyph->SetScaleModeToScaleByVector(); glyph->SetScaleFactor(size); glyph->OrientOn(); glyph->Update(); } }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(NormalEstimation) find_package(VTK COMPONENTS vtkCommonColor vtkCommonCore vtkFiltersCore vtkFiltersPoints vtkFiltersSources vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping NormalEstimation: ${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(NormalEstimation MACOSX_BUNDLE NormalEstimation.cxx ) target_link_libraries(NormalEstimation PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(NormalEstimation MACOSX_BUNDLE NormalEstimation.cxx ) target_link_libraries(NormalEstimation PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS NormalEstimation MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build NormalEstimation¶
Click here to download NormalEstimation and its CMakeLists.txt file. Once the tarball NormalEstimation.tar has been downloaded and extracted,
cd NormalEstimation/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:
./NormalEstimation
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.