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
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.