Unity代替Look方法_unity 替换lookat

 *trSelf* 物体自己
 *lookPos* 需要看向的点
 * directionAxis* 需要看向的轴
 
  void AxisLookAt(Transform trSelf, Vector3 lookPos, Vector3 directionAxis)
    {
        var rotation1 = trSelf.rotation;
        var rotation = rotation1;
        var targetDir = lookPos - trSelf.position;
        //指定哪根轴朝向目标,自行修改Vector3的方向
        var fromDir = rotation1 * directionAxis;
        //计算垂直于当前方向和目标方向的轴
        var axis = Vector3.Cross(fromDir, targetDir).normalized;
        //计算当前方向和目标方向的夹角
        var angle = Vector3.Angle(fromDir, targetDir);
        //将当前朝向向目标方向旋转一定角度，这个角度值可以做插值
        rotation1 = Quaternion.AngleAxis(angle, axis) * rotation;
        trSelf.rotation = rotation1;
    }
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