How to have a game object register its OnTriggerEnter function?

Questions & Answers
1

I’m working on a 2D Plateformer. A mechanic in the game is that the gravity reverses when the player passes through a certain section of the level. On my player I have a script with the following function:

	void OnTriggerEnter(Collider other)
		{
			switch (other.tag)
				{
					case "GravityDown":
						Physics2D.gravity = new Vector2(0f, -9.81f);
						Debug.Log("Gravity is Down");
						break;

					case "GravityUp":
						Physics2D.gravity = new Vector2(0f, 9.81f);
						Debug.Log("Gravity is Up");
						break;
				}
		}

However I can’t get the trigger event to register when my player passes through the triggers. I’ve combed through tutorials and done/checked everything I could think of and it still doesn’t do anything. Also I’ve tested the gravity commands via certain inputs and they work just fine.

2

OnTriggerEnter2D
Try this maybe. I had this problem last time too when handling with 2D.
OnTriggerEnter2D will use your 2d colliders while OnTriggerEnter uses your 3d colliders