ZBuffer
VTKExamples/Cxx/Utilities/ZBuffer
Code¶
ZBuffer.cxx
// This demo creates depth map for a polydata instance by extracting // exact ZBuffer values. #include <vtkSmartPointer.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkXMLPolyDataReader.h> #include <vtkBMPWriter.h> #include <vtkWindowToImageFilter.h> #include <vtkImageShiftScale.h> int main(int argc, char *argv[]) { if (argc < 3) { std::cout << "Usage: " << argv[0] << " input(.vtp) output(.bmp)" << std::endl; return EXIT_FAILURE; } vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New(); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkXMLPolyDataReader> fileReader = vtkSmartPointer<vtkXMLPolyDataReader>::New(); vtkSmartPointer<vtkWindowToImageFilter> filter = vtkSmartPointer<vtkWindowToImageFilter>::New(); vtkSmartPointer<vtkBMPWriter> imageWriter = vtkSmartPointer<vtkBMPWriter>::New(); vtkSmartPointer<vtkImageShiftScale> scale = vtkSmartPointer<vtkImageShiftScale>::New(); // Read .vtp file fileReader->SetFileName(argv[1]); //Build visualization enviroment mapper->SetInputConnection(fileReader->GetOutputPort()); actor->SetMapper(mapper); renderer->AddActor(actor); renWin->AddRenderer(renderer); interactor->SetRenderWindow(renWin); renWin->Render(); // Create Depth Map filter->SetInput(renWin); filter->SetMagnification(1); filter->SetInputBufferTypeToZBuffer(); //Extract z buffer value scale->SetOutputScalarTypeToUnsignedChar(); scale->SetInputConnection(filter->GetOutputPort()); scale->SetShift(0); scale->SetScale(-255); // Write depth map as a .bmp image imageWriter->SetFileName(argv[2]); imageWriter->SetInputConnection(scale->GetOutputPort()); imageWriter->Write(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ZBuffer) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ZBuffer MACOSX_BUNDLE ZBuffer.cxx) target_link_libraries(ZBuffer ${VTK_LIBRARIES})
Download and Build ZBuffer¶
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 Some tarballs may be missing or out-of-date.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 ZBuffer and its CMakeLists.txt file. Once the tarball ZBuffer.tar has been downloaded and extracted,
cd ZBuffer/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:
./ZBuffer
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.