Follow gaze in Unity for THETA 360 images

followView.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class followView : MonoBehaviour {
	bool mouseDown = false;
	float mouseX;
	float mouseY;

	Camera mainCamera;

	void Start () {
		mainCamera = GetComponent<Camera>();
	}

	void Update () {

		if(Input.GetMouseButtonDown(0) && !mouseDown )
		{                
			mouseDown = true;

			mouseX = Input.mousePosition.x;
			mouseY = Input.mousePosition.y;
		}
		else if(Input.GetMouseButtonUp(0) && mouseDown)
		{                
			mouseDown = false;
		}
	}

	void LateUpdate()
	{
		if(mouseDown)
		{
			float mouseXStop = Input.mousePosition.x;
			float mouseYStop = Input.mousePosition.y;
			float deltaX = mouseXStop - mouseX;
			float deltaY = mouseYStop - mouseY;
			float centerXNew = Screen.width / 2 + deltaX;
			float centerYNew = Screen.height / 2 + deltaY;

			Vector3 Gaze = mainCamera.ScreenToWorldPoint(new Vector3(centerXNew, centerYNew, mainCamera.nearClipPlane));
			transform.LookAt(Gaze);
			mouseX = mouseXStop;
			mouseY = mouseYStop;
		}
	}
}