方向キーでAnimator Componentのパラメータを変更する

PlayerControl.cs

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Animator))]
public class PlayerControl : MonoBehaviour {

	private Animator animator;

	// Use this for initialization
	void Start () {
		animator = GetComponent<Animator> ();
	}
	
	// Update is called once per frame
	void Update () {
		animator.SetBool ("DownArrow", Input.GetKey(KeyCode.DownArrow));
		animator.SetBool ("RightArrow", Input.GetKey(KeyCode.RightArrow));
		animator.SetBool ("LeftArrow", Input.GetKey(KeyCode.LeftArrow));
	}
}