MonoBehaviour.OnTriggerEnter2D(Collider2D)
Description

Sent when another object enters a trigger collider attached to this object (2D physics only).

Further information about the other collider is reported in the Collider2D parameter passed during the call.

See Also: Collider2D class, OnTriggerExit2D, OnTriggerStay2D.
var characterInQuicksand: boolean;

function OnTriggerEnter2D(other: Collider2D) { characterInQuicksand = true; }
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public bool characterInQuicksand;
    void OnTriggerEnter2D(Collider2D other) {
        characterInQuicksand = true;
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public characterInQuicksand as bool

	def OnTriggerEnter2D(other as Collider2D) as void:
		characterInQuicksand = true