把腳本賦予給主鏡頭即可

GUI.skin = compassGUISkin;

var compassAngle : float = transform.rotation.eulerAngles.y;//得到鏡頭的y軸旋轉角度

var compassDiameter : float = 128;

var compassWidth : float = 16;

var compassWindowRect : Rect = Rect (compassPos.x,compassPos.y, compassDiameter, compassDiameter);

GUI.Label (compassWindowRect, "");

var cosAngle : float = Mathf.Cos(compassAngle*Mathf.PI/180);

var sinAngle : float = Mathf.Sin(compassAngle*Mathf.PI/180);

var xMove : float = (compassDiameter*sinAngle/2.0 + compassWidth*cosAngle/2.0);

var yMove : float = (-compassDiameter*cosAngle/2.0 + compassWidth*sinAngle/2.0);

var compassPos : Vector3 = new Vector3(compassPos.x + compassDiameter/2.0 + xMove,compassPos.y + compassDiameter/2.0 + yMove, 0); //position for matrix

var compassQuat : Quaternion = Quaternion.identity; //rotation for matrix

compassQuat.eulerAngles = Vector3(0, 0, compassAngle + 90); //set the rotation to something - rotate around z!

GUI.matrix = Matrix4x4.TRS(compassPos, compassQuat, Vector3.one); //Apply the matrix

GUI.Box(Rect(0, 0, compassDiameter, compassWidth), ""); //notice how the rect starts at 0/0 and the matrix handles the position

原文：http://blog.csdn.net/myk7694503/article/details/43667427

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