# IndividualVRML

VTKExamples/Cxx/IO/IndividualVRML

### Description

This example shows how to obtain each object of a scene and get it's initial transformation. The selected actor is represented in wireframe. To run this example,

IndividualVRML filename actorname

The .wrl file must contain a Shape with a DEF name.

### Code

IndividualVRML.cxx

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkVRMLImporter.h>
    #include <vtkDataSet.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>
    #include <vtkProperty.h>
    #include <vtkTransform.h>
    #include <vtkAxesActor.h>

    int main ( int argc, char *argv[])
    {
      if(argc != 3)
      {
        std::cout << "Required arguments: Filename Actorname" << std::endl;
        return EXIT_FAILURE;
      }

      std::string filename = argv[1];
      std::cout << "Showing " << argv[2] << " from " << filename << std::endl;

      vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // VRML Import
      vtkSmartPointer<vtkVRMLImporter> importer = vtkSmartPointer<vtkVRMLImporter>::New();
      importer->SetFileName ( filename.c_str() );
      importer->Read();
      importer->SetRenderWindow(renderWindow);
      importer->Update();

      // ----------------------------------------------------------
      vtkObject* defActor = importer->GetVRMLDEFObject(argv[2]);
      if (defActor == NULL)
      {
        std::cout << "Cannot locate actor " << argv[2]
                  << " in " << filename << std::endl;
        importer->Print(std::cout);
        return EXIT_FAILURE;
      }

      vtkActor* actor = static_cast <vtkActor*> (defActor);
      double color[3] = {0.89,0.81,0.34};
      actor->GetProperty()->SetColor(color);
      actor->GetProperty()->SetRepresentationToWireframe();

      vtkSmartPointer<vtkTransform> transform =
        vtkSmartPointer<vtkTransform>::New();

      transform->Translate(actor->GetCenter()[0],
                           actor->GetCenter()[1],
                           actor->GetCenter()[2]);
      // axes
      vtkSmartPointer<vtkAxesActor> axes = vtkSmartPointer<vtkAxesActor>::New();

      double l[3];
      l[0] = (actor->GetBounds()[1] - actor->GetBounds()[0]) * 1.5;
      l[1] = (actor->GetBounds()[3] - actor->GetBounds()[2]) * 1.5;
      l[2] = (actor->GetBounds()[5] - actor->GetBounds()[4]) * 1.5;

      axes->SetTotalLength(l);
      axes->SetUserTransform(transform);
      renderer->AddActor(axes);
      renderer->SetBackground( .2, .3, .7);

      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(IndividualVRML)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(IndividualVRML MACOSX_BUNDLE IndividualVRML.cxx )

    target_link_libraries(IndividualVRML ${VTK_LIBRARIES})

### Download and Build IndividualVRML

Click here to download IndividualVRML and its CMakeLists.txt file. Once the tarball IndividualVRML.tar has been downloaded and extracted,

    cd IndividualVRML/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:

    ./IndividualVRML

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.