+ SGPropertyNode *n = fgGetNode("/sim/current-view", true);
+ n->tie("viewer-x-m", SGRawValuePointer<double>(&abs_viewer_position[0]));
+ n->tie("viewer-y-m", SGRawValuePointer<double>(&abs_viewer_position[1]));
+ n->tie("viewer-z-m", SGRawValuePointer<double>(&abs_viewer_position[2]));