code: public static GVRSceneObject loadModel(final GVRContext gvrContext,
                                             final String modelFile) throws IOException {
          return loadModel(gvrContext, modelFile, new HashMap<String, Integer>());
      }
docs: Load model from file
  
  @param gvrContext Valid {@link GVRContext} instance
  @param modelFile Path to the model's file, relative to the {@code assets} directory
  @return root object The root {@link GVRSceneObject} of the model
  @throws IOException If reading the model file fails