public static void UpdateWithMouse() {
            //// vars ////
            float   minY,
                    maxY,
                    focusAngle = Player.FocusAngle,
                    focusToMinY,
                    focusToMaxY,
                    mouseX = Input.GetAxis("Mouse X"),
                    mouseY = Input.GetAxis("Mouse Y"),
                    lookSpeed = GameProperties.LookSpeed,
                    angleX,
                    angleY;
            //// work ////
            // assign current rotation limits
            if(Player.CurLocation.UseRotLimits) {
                minY = Player.CurLocation.RotLimits.z;
                maxY = Player.CurLocation.RotLimits.w;
            }
            else {
                minY = GameProperties.RotMinY;
                maxY = GameProperties.RotMaxY;
            }
            // assign 'focusTo' vars
            focusToMinY = focusAngle - minY;
            focusToMaxY = focusAngle - maxY;
            // find angleX & angleY
            angleX = mouseX * lookSpeed;
            angleY = mouseY * lookSpeed;
            angleY = Mathf.Clamp(angleY, focusToMinY, focusToMaxY);
            // rotate Focus around player
            Player.Focus.RotateAround(Player.Pos, Player.Right, angleY);
            Player.Focus.RotateAround(Player.Pos, Player.Up, angleX);
            // make Player look at his FocusPoint
            Player.Obj.LookAt(Player.FocusPos);
        }