tidy up method call handler and add example project with camera panning

example/pubspec.yaml

@@ -39,16 +39,14 @@ dev_dependencies:
 
 # The following section is specific to Flutter.
 flutter:
-
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
   uses-material-design: true
-
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
+  assets:
+    - assets/
+    - assets/default_env/
+    - assets/BusterDrone/
+    - assets/BusterDrone/textures/
+    - assets/FlightHelmet/
+    - assets/FlightHelmet/textures/
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware.