CapClip
VTKExamples/Cxx/Meshes/CapClip
Description¶
This example shows how to generate a "cap" on a clipped polydata. It uses a clever ''trick'' to convert polylines into polygons. If a polydata file (.vtp) is provided, it will cap it. Otherwise it caps a clipped sphere.
Code¶
CapClip.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkActor.h> #include <vtkCamera.h> #include <vtkPolyDataMapper.h> #include <vtkDataSetMapper.h> #include <vtkPolyData.h> #include <vtkStripper.h> #include <vtkFeatureEdges.h> #include <vtkActor.h> #include <vtkProperty.h> #include <vtkPolyDataMapper.h> #include <vtkClipPolyData.h> #include <vtkPlane.h> #include <vtkXMLPolyDataReader.h> #include <vtkSphereSource.h> // // Demonstrate the use of clipping and capping on polyhedral data // int main (int argc, char *argv[]) { // PolyData to process vtkSmartPointer<vtkPolyData> polyData; if (argc > 1) { vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); reader->SetFileName(argv[1]); reader->Update(); polyData = reader->GetOutput(); } else { // Create a sphere vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetThetaResolution(20); sphereSource->SetPhiResolution(11); vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New(); plane->SetOrigin(0,0,0); plane->SetNormal(1.0, -1.0, -1.0); vtkSmartPointer<vtkClipPolyData> clipper = vtkSmartPointer<vtkClipPolyData>::New(); clipper->SetInputConnection(sphereSource->GetOutputPort()); clipper->SetClipFunction(plane); clipper->SetValue(0); clipper->Update(); polyData = clipper->GetOutput(); } vtkSmartPointer<vtkDataSetMapper> clipMapper = vtkSmartPointer<vtkDataSetMapper>::New(); #if VTK_MAJOR_VERSION <= 5 clipMapper->SetInput(polyData); #else clipMapper->SetInputData(polyData); #endif vtkSmartPointer<vtkActor> clipActor = vtkSmartPointer<vtkActor>::New(); clipActor->SetMapper(clipMapper); clipActor->GetProperty()->SetColor(1.0000,0.3882,0.2784); clipActor->GetProperty()->SetInterpolationToFlat(); // Now extract feature edges vtkSmartPointer<vtkFeatureEdges> boundaryEdges = vtkSmartPointer<vtkFeatureEdges>::New(); #if VTK_MAJOR_VERSION <= 5 boundaryEdges->SetInput(polyData); #else boundaryEdges->SetInputData(polyData); #endif boundaryEdges->BoundaryEdgesOn(); boundaryEdges->FeatureEdgesOff(); boundaryEdges->NonManifoldEdgesOff(); boundaryEdges->ManifoldEdgesOff(); vtkSmartPointer<vtkStripper> boundaryStrips = vtkSmartPointer<vtkStripper>::New(); boundaryStrips->SetInputConnection(boundaryEdges->GetOutputPort()); boundaryStrips->Update(); // Change the polylines into polygons vtkSmartPointer<vtkPolyData> boundaryPoly = vtkSmartPointer<vtkPolyData>::New(); boundaryPoly->SetPoints(boundaryStrips->GetOutput()->GetPoints()); boundaryPoly->SetPolys(boundaryStrips->GetOutput()->GetLines()); vtkSmartPointer<vtkPolyDataMapper> boundaryMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 boundaryMapper->SetInput(boundaryPoly); #else boundaryMapper->SetInputData(boundaryPoly); #endif vtkSmartPointer<vtkActor> boundaryActor = vtkSmartPointer<vtkActor>::New(); boundaryActor->SetMapper(boundaryMapper); boundaryActor->GetProperty()->SetColor(0.8900,0.8100,0.3400); // Create graphics stuff // vtkSmartPointer<vtkRenderer> ren1 = vtkSmartPointer<vtkRenderer>::New(); ren1->SetBackground(.1, .2, .3); 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(clipActor); ren1->AddActor(boundaryActor); // Generate an interesting view // ren1->ResetCamera(); ren1->GetActiveCamera()->Azimuth(30); ren1->GetActiveCamera()->Elevation(30); ren1->GetActiveCamera()->Dolly(1.2); ren1->ResetCameraClippingRange(); iren->Initialize(); iren->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(CapClip) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(CapClip MACOSX_BUNDLE CapClip.cxx) target_link_libraries(CapClip ${VTK_LIBRARIES})
Download and Build CapClip¶
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 CapClip and its CMakeLists.txt file. Once the tarball CapClip.tar has been downloaded and extracted,
cd CapClip/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:
./CapClip
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.