Box2D As3 Collision Detection: Ball Fall Down with Spark
Contacts are created in Box2D Physics simulation when two shape's AABBs overlap. Therefore we can use Contacts to manage collision between shapes.
Flash Box2D Physics Simulation Tutorial Content
Contacts are objects created by Box2D to manage collision detection between shapes. We can receive contact data by implementing b2ContactListener. This listener reports a contact point when it is created, when it persists for more than one time step, and when it is destroyed. Keep in mind that two shapes may have multiple contact points.
In this Box2D collision detection tutorial, we use ContactListener to listen to when hitting contacts are created between the falling ball and the slope. For interesting effect we add a sparkle effect when the falling ball touch the slope.
Click your mouse anywhere on the above MovieClip, a ball will be falling down from the mouse pointer. Please play around how it works.
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This Box2D ActionScript tutorial shows how to manage collision detection.