To ensure the lesson works as described, do the following steps before beginning:

1. Make sure you’ve done the steps in Preparing for the Lesson.
2. Open the scene file named EmergencyCity.mb.

   This file can be found in the GettingStartedMaya2012LessonData\Assets directory that you set as your Maya project:

   GettingStartedMaya2012LessonData\Assets\EmergencyCity.mb
   

   The scene contains a model of a city block and a police car. If you play back the animation, the police car drives along the road, stops outside one of the apartment buildings, and opens its front doors.