Unity Gizmo Function

DrawOnGizmoDrawRay.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class DrawOnGizmoDrawRay : MonoBehaviour {
	public float gizmoSpeed = 1f;
	public object gizmoedObject;
	Vector3 direction, isRay;
	
	public void OnDrawGizmos()
	{
		isRay = transform.TransformDirection (Vector3.forward) * gizmoSpeed;
		Gizmos.DrawRay (transform.position, direction);
	}
}