UnityでiOS、Android用にジョイスティックを追加した時にLocomotion で操作するには、Joystickを使う。

JoystickToEvents.cs

using UnityEngine;
using System.Collections;

public class JoystickToEvents : MonoBehaviour 
{
    public static void Do(Transform root, Transform camera, ref float speed, ref float direction)
    {
        Vector3 rootDirection = root.forward;
     	float horizontal;
    	float vertical;
        
	if ( Application.platform == RuntimePlatform.IPhonePlayer
	|| Application.platform == RuntimePlatform.Android ) {
				
		Joystick joystick;
		GameObject directionObject = GameObject.Find("Joystick");
		joystick = directionObject.GetComponent<Joystick>();

		horizontal = joystick.position.x;
    	    	vertical = joystick.position.y;

	} else {

		horizontal = Input.GetAxis("Horizontal");
        	vertical = Input.GetAxis("Vertical");

	}

	Vector3 stickDirection = new Vector3(horizontal, 0, vertical);

        // Get camera rotation.    

        Vector3 CameraDirection = camera.forward;
        CameraDirection.y = 0.0f; // kill Y
        Quaternion referentialShift = Quaternion.FromToRotation(Vector3.forward, CameraDirection);

        // Convert joystick input in Worldspace coordinates
        Vector3 moveDirection = referentialShift * stickDirection;
				
	Vector2 speedVec =  new Vector2(horizontal, vertical);
	speed = Mathf.Clamp(speedVec.magnitude, 0, 1);      

        if (speed > 0.01f)  {// dead zone
		Vector3 axis = Vector3.Cross(rootDirection, moveDirection);
		direction = Vector3.Angle(rootDirection, moveDirection) / 180.0f * (axis.y < 0 ? -1 : 1);
        } else {
            direction = 0.0f;
	}
	
    }
	
}

Standard Assets（Mobile）のJoystick.jsをStandardAssetsフォルダに入れればC#からも見られるようになり、コンパイルが通る