HandleUserJoined.cs

// When a remote user joined, this delegate will be called. Typically
	// create a GameObject to render video on it
	private void onUserJoined(uint uid, int elapsed)
	{
		Debug.Log ("onUserJoined: uid = " + uid);
		// this is called in main thread

		// find a game object to render video stream from 'uid'
		GameObject go = GameObject.Find (uid.ToString ());
		if (!ReferenceEquals (go, null)) {
			return; // reuse
		}

		// create a GameObject and assigne to this new user
		go = GameObject.CreatePrimitive (PrimitiveType.Cube);
		if (!ReferenceEquals (go, null)) {
			go.name = uid.ToString ();

			// configure videoSurface
			VideoSurface o = go.AddComponent<VideoSurface> ();
			o.SetForUser (uid);
			o.SetEnable (true);
			o.transform.Rotate (-90.0f, 0.0f, 0.0f);
			o.transform.position = getNextCubePosition();
			o.transform.localScale = Vector3.one;
		}
	}

	private static int totalUsers = 0;

	// Generate a new position to place the new cube in.  
	Vector3 getNextCubePosition()
	{
		totalUsers += 1;
		GameObject go = GameObject.Find("Sphere");
		float x = 0;
		if (go != null)
		{
			x = go.transform.position.x + totalUsers * 1.5f;
		}
		else
		{
			x = Random.Range (-2.0f, 2.0f); 
		}

		return new Vector3(x, 0, 8.17f);
	}