Touch based rotation of 3d model
I want to rotate my 3d model based on horizontal and vertical touch. So I want only x and y rotation applied into model.
But when I just swipe vertically on device then it also get z rotation as well. Here is my screenshot to give you more idea.

Here I have also attached my source code to give you more idea about problem.
 void LateUpdate ()
  {
 
   // If there are two touches on the device...
   if (Input.touchCount == 1 && GameManager.Instance.IsGameStart) {
 
    // Store currnet touch.
    Touch touch = Input.GetTouch (0);
 
    transform.RotateAround (transform.position, Vector3.up, -touch.deltaPosition.x  Time.deltaTime  15f);
    transform.RotateAround (transform.position, Vector3.right, touch.deltaPosition.y  Time.deltaTime  15f);
 
   }
 
  }
 
               Please help me to sort out this problem.
 
                 
                wrongverticlerotationmodel.png 
                (130.0 kB) 
               
 
              
               Comment
              
 
               
              Now I have some sort of improvised code but not able to stop z rotation. Here is my code :
 // Update is called once per frame
  void LateUpdate ()
  {
 
   // If there are two touches on the device...
   if (Input.touchCount == 1 && Game$$anonymous$$anager.Instance.IsGameStart) {
 
    // Store currnet touch.
    Touch touch = Input.GetTouch (0);
 
 //   transform.RotateAround (transform.position, Vector3.up, -touch.deltaPosition.x  Time.deltaTime  15f);
 //   transform.RotateAround (transform.position, Vector3.right, touch.deltaPosition.y  Time.deltaTime  15f);
 
    transform.Rotate (Vector3.up, -touch.deltaPosition.x  Time.deltaTime  10f, Space.World);
    transform.Rotate (Vector3.right, touch.deltaPosition.y  Time.deltaTime  5f, Space.World);
 
 //   transform.Rotate (Vector3.forward, 0f, Space.World);
    Vector3 objEularAngles = transform.rotation.eulerAngles;
    objEularAngles.z = 0f;
    transform.eulerAngles = objEularAngles;
      
   }
  }
 
                  Here is an image that represent what I don' t want :

In above image, globe is completely rotated in z direction. I don't want to do this.
 
                    
                   screen-shot-2016-02-07-at-33112-pm.png 
                   (62.1 kB) 
                  
 
                 Your answer