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Updated tutorial_physics_2d (markdown)

reduz 2014-04-20 13:04:06 -07:00
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tutorial_physics_2d.md

@ -114,6 +114,13 @@ As an example, here's the scene from the platformer, containing an Area2D with c
<p align="center"><img src="images/area2dcoin.png"></p>
#####Triggers
A CollisionShape2D or CollisionPolygon2D can be set as a trigger. When used in a RigidBody2D or KinematicBody2D, "trigger" shapes become non-collidable (objects can't collide against it). They just move around with the object as ghosts. This makes them useful in two situations:
* Disabling collision in a specific shape.
* Get an Area2D to trigger a body_enter / body_exit signals with non collidable objects (useful in several situations).
### CollisionPolygon2D
This one is similar to CollisionShape2D, except that instead of assigning a shape, a polygon can be edited (drawn by the user) to determine the shape. The polygon can be convex or concave, it doesn't matter.