TubeFilter
vtk-examples/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.
Question
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Code¶
TubeFilter.cxx
#include <vtkActor.h>
#include <vtkCellArray.h>
#include <vtkLine.h>
#include <vtkLineSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTubeFilter.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*[])
{
vtkNew<vtkNamedColors> colors;
// Create a line
vtkNew<vtkLineSource> lineSource;
lineSource->SetPoint1(1.0, 0.0, 0.0);
lineSource->SetPoint2(0.0, 1.0, 0.0);
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> lineMapper;
lineMapper->SetInputConnection(lineSource->GetOutputPort());
vtkNew<vtkActor> lineActor;
lineActor->GetProperty()->SetColor(colors->GetColor3d("Red").GetData());
lineActor->SetMapper(lineMapper);
// Create a tube (cylinder) around the line
vtkNew<vtkTubeFilter> tubeFilter;
tubeFilter->SetInputConnection(lineSource->GetOutputPort());
tubeFilter->SetRadius(.025); // default is .5
tubeFilter->SetNumberOfSides(50);
tubeFilter->Update();
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> tubeMapper;
tubeMapper->SetInputConnection(tubeFilter->GetOutputPort());
vtkNew<vtkActor> tubeActor;
tubeActor->GetProperty()->SetOpacity(
0.5); // Make the tube have some transparency.
tubeActor->SetMapper(tubeMapper);
// Create a renderer, render window, and interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("TubeFilter");
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actor to the scene
renderer->AddActor(tubeActor);
renderer->AddActor(lineActor);
renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(TubeFilter)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersCore
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping TubeFilter: ${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(TubeFilter MACOSX_BUNDLE TubeFilter.cxx )
target_link_libraries(TubeFilter PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(TubeFilter MACOSX_BUNDLE TubeFilter.cxx )
target_link_libraries(TubeFilter PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS TubeFilter
MODULES ${VTK_LIBRARIES}
)
endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.