ZBuffer
VTKExamples/Cxx/Utilities/ZBuffer
Question
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Code¶
ZBuffer.cxx
// This demo creates depth map for a polydata instance by extracting // exact ZBuffer values. #include <vtkSmartPointer.h> #include <vtkActor.h> #include <vtkBMPWriter.h> #include <vtkImageShiftScale.h> #include <vtkPolyDataMapper.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkVersion.h> #include <vtkWindowToImageFilter.h> #include <vtkXMLPolyDataReader.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); #if VTK_MAJOR_VERSION >= 8 || VTK_MAJOR_VERSION == 8 && VTK_MINOR_VERSION >= 90 filter->SetScale(1); #else filter->SetMagnification(1); #endif 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 3.3 FATAL_ERROR) project(ZBuffer) find_package(VTK COMPONENTS vtkCommonCore vtkIOImage vtkIOXML vtkImagingCore vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping ZBuffer: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(ZBuffer MACOSX_BUNDLE ZBuffer.cxx ) target_link_libraries(ZBuffer PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(ZBuffer MACOSX_BUNDLE ZBuffer.cxx ) target_link_libraries(ZBuffer PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS ZBuffer MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build ZBuffer¶
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.