LinkedCamera.cs

using UnityEngine;
using System.Collections;

public class LinkedCamera : MonoBehaviour {
	// What transform to chase:
	public Transform target;
	
	// Debug keyboard controls:
	public KeyCode modifier;
	public KeyCode incSmooth;
	public KeyCode decSmooth;
	
	private Vector3 moveVel;
	private Vector3 rotVel;
	
	void Awake() {
		moveVel = Vector3.zero;
		rotVel = Vector3.zero;
	}
		
	void Update () {
		if (modifier == KeyCode.None || Input.GetKey (modifier)) {	
			if (Input.GetKey (incSmooth)) {
				Globals.settings.companionCamSmoothingValue += 0.001f;
			}
			if (Input.GetKey (decSmooth)) {
				Globals.settings.companionCamSmoothingValue -= 0.001f;
				if (Globals.settings.companionCamSmoothingValue < 0) Globals.settings.companionCamSmoothingValue = 0;
				if (Globals.settings.companionCamSmoothingValue < 0) Globals.settings.companionCamSmoothingValue = 0;
			}
		}
		
		float deltaTime = Time.fixedDeltaTime;
		
		transform.position = Vector3.SmoothDamp(transform.position, target.position, ref moveVel, Globals.settings.companionCamSmoothingValue, Mathf.Infinity, deltaTime);
		
		Vector3 eulerAngles = this.transform.rotation.eulerAngles;
		Vector3 targetEulerAngles = target.eulerAngles;
		eulerAngles.x = Mathf.SmoothDampAngle(eulerAngles.x, targetEulerAngles.x, ref rotVel.x, Globals.settings.companionCamSmoothingValue, Mathf.Infinity, deltaTime);
		eulerAngles.y = Mathf.SmoothDampAngle(eulerAngles.y, targetEulerAngles.y, ref rotVel.y, Globals.settings.companionCamSmoothingValue, Mathf.Infinity, deltaTime);
		eulerAngles.z = Mathf.SmoothDampAngle(eulerAngles.z, targetEulerAngles.z, ref rotVel.z, Globals.settings.companionCamSmoothingValue, Mathf.Infinity, deltaTime);
		
		this.transform.rotation = Quaternion.Euler (eulerAngles);
	}
}