ImplicitPlaneWidget2
VTKExamples/Cxx/Widgets/ImplicitPlaneWidget2
Description¶
This example shows how to use the second generation ImplicitPlaneWidget2 to interactively define the clipping plane for a polydata. If no arguments are specified, a vtkSphereSource generates the polydata. By specifying a .vtp file, the example can operate on arbitrary polydata.
For example, try VTKData/Data/cow.vtp.
Code¶
ImplicitPlaneWidget2.cxx
#include <vtkSmartPointer.h> #include <vtkXMLPolyDataReader.h> #include <vtkSphereSource.h> #include <vtkClipPolyData.h> #include <vtkPlane.h> #include <vtkCommand.h> #include <vtkImplicitPlaneWidget2.h> #include <vtkImplicitPlaneRepresentation.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> // Callback for the interaction // This does the actual work: updates the vtkPlane implicit function. // This in turn causes the pipeline to update and clip the object. class vtkIPWCallback : public vtkCommand { public: static vtkIPWCallback *New() { return new vtkIPWCallback; } virtual void Execute(vtkObject *caller, unsigned long, void*) { vtkImplicitPlaneWidget2 *planeWidget = reinterpret_cast<vtkImplicitPlaneWidget2*>(caller); vtkImplicitPlaneRepresentation *rep = reinterpret_cast<vtkImplicitPlaneRepresentation*>(planeWidget->GetRepresentation()); rep->GetPlane(this->Plane); } vtkIPWCallback():Plane(0),Actor(0) {} vtkPlane *Plane; vtkActor *Actor; }; int main(int argc, char *argv[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetRadius(10.0); vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); // Setup a visualization pipeline vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New(); vtkSmartPointer<vtkClipPolyData> clipper = vtkSmartPointer<vtkClipPolyData>::New(); clipper->SetClipFunction(plane); clipper->InsideOutOn(); if (argc < 2) { clipper->SetInputConnection(sphereSource->GetOutputPort()); } else { reader->SetFileName(argv[1]); clipper->SetInputConnection(reader->GetOutputPort()); } // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(clipper->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); vtkSmartPointer<vtkProperty> backFaces = vtkSmartPointer<vtkProperty>::New(); backFaces->SetDiffuseColor(.8, .8, .4); actor->SetBackfaceProperty(backFaces); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); renderer->AddActor(actor); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindow->Render(); // The callback will do the work vtkSmartPointer<vtkIPWCallback> myCallback = vtkSmartPointer<vtkIPWCallback>::New(); myCallback->Plane = plane; myCallback->Actor = actor; vtkSmartPointer<vtkImplicitPlaneRepresentation> rep = vtkSmartPointer<vtkImplicitPlaneRepresentation>::New(); rep->SetPlaceFactor(1.25); // This must be set prior to placing the widget rep->PlaceWidget(actor->GetBounds()); rep->SetNormal(plane->GetNormal()); vtkSmartPointer<vtkImplicitPlaneWidget2> planeWidget = vtkSmartPointer<vtkImplicitPlaneWidget2>::New(); planeWidget->SetInteractor(renderWindowInteractor); planeWidget->SetRepresentation(rep); planeWidget->AddObserver(vtkCommand::InteractionEvent,myCallback); // Render renderWindowInteractor->Initialize(); renderWindow->Render(); planeWidget->On(); // Begin mouse interaction renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImplicitPlaneWidget2) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImplicitPlaneWidget2 MACOSX_BUNDLE ImplicitPlaneWidget2.cxx) target_link_libraries(ImplicitPlaneWidget2 ${VTK_LIBRARIES})
Download and Build ImplicitPlaneWidget2¶
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 ImplicitPlaneWidget2 and its CMakeLists.txt file. Once the tarball ImplicitPlaneWidget2.tar has been downloaded and extracted,
cd ImplicitPlaneWidget2/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:
./ImplicitPlaneWidget2
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.