A simplest ever Third person controller for standalone Unity3d

GZCharacterControl.cs

using UnityEngine;
using System.Collections;
[RequireComponent(typeof(CapsuleCollider))]
[RequireComponent(typeof(CharacterController))]
public class GZThirdPersonSimplified : MonoBehaviour {

	[SerializeField] float m_TurnSpeed = 20;
	[SerializeField] float m_TurnAmount;
	Vector3 RotationVector;
	[SerializeField] Vector3 moveDirection = Vector3.zero;
	public float speed = 6.0F;
	public float jumpSpeed = 8.0F;
	public float gravity = 20.0F;



	void Update() {
		CharacterController controller = GetComponent<CharacterController>();
		if (controller.isGrounded) {
			moveDirection = new Vector3(Input.GetAxis("Horizontal")  , 0, Input.GetAxis("Vertical") );
			moveDirection = transform.TransformDirection(moveDirection);
			RotationVector = moveDirection.x *Vector3.left + moveDirection.z*Vector3.forward;
			if(moveDirection != Vector3.zero){
				moveDirection = transform.forward ;

			}
				GetComponent<Animator>().SetBool("Walk",true);
				moveDirection *= speed;

				if (Input.GetButton("Jump"))
					moveDirection.y = jumpSpeed;
			
		}
		moveDirection.y -= gravity * Time.deltaTime;
		controller.Move(moveDirection * Time.deltaTime);
		m_TurnAmount = Mathf.Atan2(RotationVector.x,RotationVector.z);
		transform.Rotate(0, m_TurnAmount * m_TurnSpeed * Time.deltaTime, 0);

	}
}