Legacy Documentation: Version 4.6.2
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Collider2D.OnTriggerEnter2D(Collider2D)

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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.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public bool characterInQuicksand;
    void OnTriggerEnter2D(Collider2D other) {
        characterInQuicksand = true;
    }
}