Learning Gravity, Basic Physics, and Camera Controls: An Angry Birds-like Game, Part I - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 189

Figure 6-34. Adding walls to the scene
Next, double-click the Projectile actor instance on the scene. Remember that
because you have edited this instance (unlock), it will not incorporate changes
made on the prototype. Drag and drop a Collide behavior on the top of the
behaviors and change the settings to Bounce when colliding with ''actor of type''
''Wall,'' as shown in Figure 6-35.
Figure 6-35. Bouncing on the walls
Hit Preview to test your work.