// Add resources to 3D stream (if present in DOM)
handleResources(root, stream);
// Make 3D Annotation and handle attributes from FO3D DOM object
PDF3DAnnotation annot = pdfi.factory.make3DAnnotation(pdfi.aRect);
handleAnnotationAttribs(root, annot);
// Establish the connection between 3D annotation and 3D stream.
// Maybe a 3D reference dictionary is used if the attribute "refname"
// is set and equal in more than one 3D annotation. (3D models "src"