EscapeTheRoom/Assets/Scripts/monsterAI.cs

using UnityEngine;
using System.Collections;

public class monsterAI : MonoBehaviour
{
	public GameObject player;
	private Transform target;
	public float deadlyDistance;
	public float rotationDamping; // Lower rotation damping = slower rotation
	public float moveSpeed;


	public float distance;

	// Use this for initialization
	void Start ()
	{
		target = player.transform;
	
	}
	
	// Update is called once per frame
	void Update ()
	{
		if (IsAtDeadlyDistance ()) {
			// Kill the player
		} else {
			LookAtTarget ();
			MoveTowardTarget ();
		}
	
	}

	// Check is the current distance is deadly for the target 
	bool IsAtDeadlyDistance ()
	{
		return (Vector3.Distance (target.position, transform.position) <= deadlyDistance);
	}

	// Look toward target
	void LookAtTarget ()
	{
		Vector3 relativePos = target.position - transform.position;
		Quaternion rotation = Quaternion.LookRotation (relativePos);

		transform.rotation = Quaternion.Slerp (transform.rotation, rotation, Time.deltaTime * rotationDamping);
	}

	// Follow player from a certain initial distance at a certain speed.
	void MoveTowardTarget ()
	{
		transform.Translate (Vector3.forward * moveSpeed * Time.deltaTime);
	}

}