ExtractVisibleCells
VTKExamples/Cxx/Filtering/ExtractVisibleCells
Code
ExtractVisibleCells.cxx
#include <vtkVersion.h>
#include <vtkSphereSource.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkHardwareSelector.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h>
#include <vtkRendererCollection.h>
#include <vtkDataSetMapper.h>
#include <vtkExtractSelection.h>
#include <vtkSelection.h>
#include <vtkProperty.h>
// Define interaction style
class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static KeyPressInteractorStyle* New();
vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleTrackballCamera);
virtual void OnKeyPress()
{
// Get the keypress
std::string key = this->Interactor->GetKeySym();
// "s" for "s"elect
if(key.compare("s") == 0)
{
vtkSmartPointer<vtkHardwareSelector> selector =
vtkSmartPointer<vtkHardwareSelector>::New();
selector->SetRenderer(this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
int* temp = this->Interactor->GetRenderWindow()->GetSize();
unsigned int windowSize[4];
windowSize[0] = temp[2];
windowSize[1] = temp[3];
windowSize[2] = temp[0];
windowSize[3] = temp[1];
/*
for(unsigned int i = 0; i < 4; i++)
{
windowSize[i] = temp[i];
}
*/
selector->SetArea(windowSize);
selector->SetFieldAssociation(vtkDataObject::FIELD_ASSOCIATION_CELLS);
vtkSelection* selection = selector->Select();
std::cout << "Selection has " << selection->GetNumberOfNodes() << " nodes." << std::endl;
vtkSmartPointer<vtkExtractSelection> extractSelection =
vtkSmartPointer<vtkExtractSelection>::New();
#if VTK_MAJOR_VERSION <= 5
extractSelection->SetInput(0, this->Data);
extractSelection->SetInput(1, selection);
#else
extractSelection->SetInputData(0, this->Data);
extractSelection->SetInputData(1, selection);
#endif
extractSelection->Update();
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
mapper->SetInputConnection(extractSelection->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(1,0,0);
this->Renderer->AddActor(actor);
}
// Forward events
vtkInteractorStyleTrackballCamera::OnKeyPress();
}
vtkPolyData* Data;
vtkRenderer* Renderer;
};
vtkStandardNewMacro(KeyPressInteractorStyle);
int main(int , char *[])
{
// Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5.0);
sphereSource->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetMultiSamples(0); // Turn off anti-aliasing
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkSmartPointer<KeyPressInteractorStyle> style =
vtkSmartPointer<KeyPressInteractorStyle>::New();
style->Renderer = renderer;
renderWindowInteractor->SetInteractorStyle(style);
style->SetCurrentRenderer(renderer);
style->Data = sphereSource->GetOutput();
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(.3, .6, .3); // Background color green
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ExtractVisibleCells)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ExtractVisibleCells MACOSX_BUNDLE ExtractVisibleCells.cxx)
target_link_libraries(ExtractVisibleCells ${VTK_LIBRARIES})
Download and Build ExtractVisibleCells
Click here to download ExtractVisibleCells and its CMakeLists.txt file. Once the tarball ExtractVisibleCells.tar has been downloaded and extracted,
cd ExtractVisibleCells/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:
./ExtractVisibleCells
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.