@MarshalsPointer
 public static SCNSceneAttribute toObject(
     Class<SCNSceneAttribute> cls, long handle, long flags) {
   NSString o = (NSString) NSObject.Marshaler.toObject(NSString.class, handle, flags);
   if (o == null) {
     return null;
   }
   return SCNSceneAttribute.valueOf(o);
 }