ImageToPolyDataFilter
VTKExamples/Cxx/Images/ImageToPolyDataFilter
Code¶
ImageToPolyDataFilter.cxx
#include <vtkActor.h> #include <vtkLookupTable.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkImageToPolyDataFilter.h> #include <vtkImageQuantizeRGBToIndex.h> #include <vtkCamera.h> #include <vtkPNGReader.h> #include <vtkTriangleFilter.h> int main(int argc, char *argv[]) { if(argc < 2) { std::cerr << "Required arguments: filename.png" << std::endl; return EXIT_FAILURE; } vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New(); reader->SetFileName(argv[1]); vtkSmartPointer<vtkImageQuantizeRGBToIndex> quant = vtkSmartPointer<vtkImageQuantizeRGBToIndex>::New(); quant->SetInputConnection(reader->GetOutputPort()); quant->SetNumberOfColors(16); vtkSmartPointer<vtkImageToPolyDataFilter> i2pd = vtkSmartPointer<vtkImageToPolyDataFilter>::New(); i2pd->SetInputConnection(quant->GetOutputPort()); i2pd->SetLookupTable(quant->GetLookupTable()); i2pd->SetColorModeToLUT(); i2pd->SetOutputStyleToPolygonalize(); i2pd->SetError(0); i2pd->DecimationOn(); i2pd->SetDecimationError(0.0); i2pd->SetSubImageSize(25); // Need a triangle filter because the polygons are complex and concave vtkSmartPointer<vtkTriangleFilter> tf = vtkSmartPointer<vtkTriangleFilter>::New(); tf->SetInputConnection(i2pd->GetOutputPort()); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(tf->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetRepresentationToWireframe(); // Visualize vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); renderer->AddActor(actor); renderer->SetBackground(1, 1, 1); renderWindow->SetSize(300, 250); interactor->Initialize(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageToPolyDataFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageToPolyDataFilter MACOSX_BUNDLE ImageToPolyDataFilter.cxx) target_link_libraries(ImageToPolyDataFilter ${VTK_LIBRARIES})
Download and Build ImageToPolyDataFilter¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ImageToPolyDataFilter and its CMakeLists.txt file. Once the tarball ImageToPolyDataFilter.tar has been downloaded and extracted,
cd ImageToPolyDataFilter/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:
./ImageToPolyDataFilter
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.