VTK/Examples/Cxx/ImageData/ExtractVOI
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ExtractVOI.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkExtractVOI.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageMandelbrotSource.h>
int main(int, char *[])
{
// Create an image
vtkSmartPointer<vtkImageMandelbrotSource> source =
vtkSmartPointer<vtkImageMandelbrotSource>::New();
source->Update();
int* inputDims = source->GetOutput()->GetDimensions();
std::cout << "Dims: " << " x: " << inputDims[0]
<< " y: " << inputDims[1]
<< " z: " << inputDims[2] << std::endl;
std::cout << "Number of points: " << source->GetOutput()->GetNumberOfPoints() << std::endl;
std::cout << "Number of cells: " << source->GetOutput()->GetNumberOfCells() << std::endl;
vtkSmartPointer<vtkExtractVOI> extractVOI =
vtkSmartPointer<vtkExtractVOI>::New();
extractVOI->SetInputConnection(source->GetOutputPort());
extractVOI->SetVOI(inputDims[0]/4.,3.*inputDims[0]/4.,inputDims[1]/4.,3.*inputDims[1]/4., 0, 0);
extractVOI->Update();
vtkImageData* extracted = extractVOI->GetOutput();
int* extractedDims = extracted->GetDimensions();
std::cout << "Dims: " << " x: " << extractedDims[0]
<< " y: " << extractedDims[1]
<< " z: " << extractedDims[2] << std::endl;
std::cout << "Number of points: " << extracted->GetNumberOfPoints() << std::endl;
std::cout << "Number of cells: " << extracted->GetNumberOfCells() << std::endl;
vtkSmartPointer<vtkImageCast> inputCastFilter =
vtkSmartPointer<vtkImageCast>::New();
inputCastFilter->SetInputConnection(source->GetOutputPort());
inputCastFilter->SetOutputScalarTypeToUnsignedChar();
inputCastFilter->Update();
vtkSmartPointer<vtkImageCast> extractedCastFilter =
vtkSmartPointer<vtkImageCast>::New();
#if VTK_MAJOR_VERSION <= 5
extractedCastFilter->SetInputConnection(extracted->GetProducerPort());
#else
extractedCastFilter->SetInputData(extracted);
#endif
extractedCastFilter->SetOutputScalarTypeToUnsignedChar();
extractedCastFilter->Update();
// Create actors
vtkSmartPointer<vtkImageActor> inputActor =
vtkSmartPointer<vtkImageActor>::New();
inputActor->GetMapper()->SetInputConnection(
inputCastFilter->GetOutputPort());
vtkSmartPointer<vtkImageActor> extractedActor =
vtkSmartPointer<vtkImageActor>::New();
extractedActor->GetMapper()->SetInputConnection(
extractedCastFilter->GetOutputPort());
// There will be one render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600, 300);
// And one interactor
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
// Define viewport ranges
// (xmin, ymin, xmax, ymax)
double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
// Setup both renderers
vtkSmartPointer<vtkRenderer> leftRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(leftRenderer);
leftRenderer->SetViewport(leftViewport);
leftRenderer->SetBackground(.6, .5, .4);
vtkSmartPointer<vtkRenderer> rightRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(rightRenderer);
rightRenderer->SetViewport(rightViewport);
rightRenderer->SetBackground(.4, .5, .6);
leftRenderer->AddActor(inputActor);
rightRenderer->AddActor(extractedActor);
leftRenderer->ResetCamera();
rightRenderer->ResetCamera();
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
Please try the new VTKExamples website.
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ExtractVOI)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ExtractVOI MACOSX_BUNDLE ExtractVOI.cxx)
if(VTK_LIBRARIES)
target_link_libraries(ExtractVOI ${VTK_LIBRARIES})
else()
target_link_libraries(ExtractVOI vtkHybrid vtkWidgets)
endif()
Download and Build ExtractVOI
Click here to download ExtractVOI. and its CMakeLists.txt file.
Once the tarball ExtractVOI.tar has been downloaded and extracted,
cd ExtractVOI/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:
./ExtractVOI
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.