ColorDisconnectedRegions
VTKExamples/Cxx/PolyData/ColorDisconnectedRegions
Code
ColorDisconnectedRegions.cxx
#include <vtkSmartPointer.h>
#include <vtkPointData.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataConnectivityFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkAppendPolyData.h>
int main(int, char*[])
{
// Create some spheres
vtkSmartPointer<vtkSphereSource> sphereSource1 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource1->Update();
vtkSmartPointer<vtkSphereSource> sphereSource2 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource2->SetCenter(5,0,0);
sphereSource2->Update();
vtkSmartPointer<vtkSphereSource> sphereSource3 =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource3->SetCenter(10,0,0);
sphereSource3->Update();
vtkSmartPointer<vtkAppendPolyData> appendFilter =
vtkSmartPointer<vtkAppendPolyData>::New();
appendFilter->AddInputConnection(sphereSource1->GetOutputPort());
appendFilter->AddInputConnection(sphereSource2->GetOutputPort());
appendFilter->AddInputConnection(sphereSource3->GetOutputPort());
appendFilter->Update();
vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter =
vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
connectivityFilter->SetInputConnection(appendFilter->GetOutputPort());
connectivityFilter->SetExtractionModeToAllRegions();
connectivityFilter->ColorRegionsOn();
connectivityFilter->Update();
// Visualize
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(connectivityFilter->GetOutputPort());
mapper->SetScalarRange(connectivityFilter->GetOutput()->GetPointData()->GetArray("RegionId")->GetRange());
mapper->Update();
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
interactor->Initialize();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ColorDisconnectedRegions)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ColorDisconnectedRegions MACOSX_BUNDLE ColorDisconnectedRegions.cxx)
target_link_libraries(ColorDisconnectedRegions ${VTK_LIBRARIES})
Download and Build ColorDisconnectedRegions
Click here to download ColorDisconnectedRegions and its CMakeLists.txt file. Once the tarball ColorDisconnectedRegions.tar has been downloaded and extracted,
cd ColorDisconnectedRegions/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:
./ColorDisconnectedRegions
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.