#include <simgear/scene/model/placement.hxx>
#include <simgear/scene/model/modellib.hxx>
#include <simgear/structure/exception.hxx>
#include <simgear/scene/model/placement.hxx>
#include <simgear/scene/model/modellib.hxx>
#include <simgear/structure/exception.hxx>