TubeFilter
VTKExamples/Cxx/PolyData/TubeFilter
Description¶
This example creates a tube around a line. This is helpful because when you zoom the camera, the thickness of a line remains constant, while the thickness of a tube varies.
Code¶
TubeFilter.cxx
#include <vtkSmartPointer.h> #include <vtkLine.h> #include <vtkCellArray.h> #include <vtkTubeFilter.h> #include <vtkLineSource.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkProperty.h> /* * This example creates a tube around a line. * This is helpful because when you zoom the camera, * the thickness of a line remains constant, * while the thickness of a tube varies. * */ int main(int, char *[]) { // Create a line vtkSmartPointer<vtkLineSource> lineSource = vtkSmartPointer<vtkLineSource>::New(); lineSource->SetPoint1(1.0, 0.0, 0.0); lineSource->SetPoint2(0.0, 1.0, 0.0); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> lineMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); lineMapper->SetInputConnection(lineSource->GetOutputPort()); vtkSmartPointer<vtkActor> lineActor = vtkSmartPointer<vtkActor>::New(); lineActor->GetProperty()->SetColor(0.0,0.0,0.1); // Give some color to the line lineActor->SetMapper(lineMapper); // Create a tube (cylinder) around the line vtkSmartPointer<vtkTubeFilter> tubeFilter = vtkSmartPointer<vtkTubeFilter>::New(); tubeFilter->SetInputConnection(lineSource->GetOutputPort()); tubeFilter->SetRadius(.025); //default is .5 tubeFilter->SetNumberOfSides(50); tubeFilter->Update(); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> tubeMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); tubeMapper->SetInputConnection(tubeFilter->GetOutputPort()); vtkSmartPointer<vtkActor> tubeActor = vtkSmartPointer<vtkActor>::New(); tubeActor->GetProperty()->SetOpacity(0.5); //Make the tube have some transparency. tubeActor->SetMapper(tubeMapper); // Create a renderer, render window, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Add the actor to the scene renderer->AddActor(tubeActor); renderer->AddActor(lineActor); renderer->SetBackground(0,1,0); // Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(TubeFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(TubeFilter MACOSX_BUNDLE TubeFilter.cxx) target_link_libraries(TubeFilter ${VTK_LIBRARIES})
Download and Build TubeFilter¶
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 TubeFilter and its CMakeLists.txt file. Once the tarball TubeFilter.tar has been downloaded and extracted,
cd TubeFilter/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:
./TubeFilter
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.