Mathf.SmoothDamp

SmoothDamp.cs

public class TestScript : MonoBehaviour
{
	public Vector3 target;
	public float smoothTime = 1f;
	public float yVelocity = 0.0f;

	void Start()
	{
	}

	void Update()
	{
		// 値をスムーズに
		float newPosition = Mathf.SmoothDamp(transform.position.y,
						     target.y,
						     ref yVelocity,
						     smoothTime);

		// 適用
		transform.position = new Vector3(transform.position.x,
						 newPosition,
					         transform.position.z);
	}
}