unity计算两个向量的夹角

        //计算两个向量夹角的角度 0~360
        private float CalculatedAngle(Vector3 srcDirection, Vector3 tarVector)
        {
            Vector3 v3 = Vector3.Cross(srcDirection,tarVector);
            if(v3.z > 0)
            {
                return Vector3.Angle(srcDirection,tarVector);
            }
            return 360 - Vector3.Angle(srcDirection, tarVector);
        }

//改变RectTransform的角度
rectTransform.eulerAngles = new Vector3(0, 0, angle);