Unity:Camera:Smooth Follow 2D

SmoothFollow2D

using UnityEngine;
using System.Collections;

public class SmoothFollow2D : MonoBehaviour {

    //offset from the viewport center to fix damping
    public float m_DampTime = 10f;
    public Transform m_Target;
    public float m_XOffset = 0;
    public float m_YOffset = 0;

	private float margin = 0.1f;

	void Start () {
		if (m_Target==null){
			m_Target = GameObject.FindGameObjectWithTag("Player").transform;
		}
	}

    void Update() {
        if(m_Target) {
			float targetX = m_Target.position.x + m_XOffset;
			float targetY = m_Target.position.y + m_YOffset;

			if (Mathf.Abs(transform.position.x - targetX) > margin)
				targetX = Mathf.Lerp(transform.position.x, targetX, 1/m_DampTime * Time.deltaTime);

			if (Mathf.Abs(transform.position.y - targetY) > margin)
				targetY = Mathf.Lerp(transform.position.y, targetY, m_DampTime * Time.deltaTime);
            
			transform.position = new Vector3(targetX, targetY, transform.position.z);
        }
    }
}