Unity3D之物体跟随鼠标移动和旋转

void FixedUpdate()
    {
        if (Input.GetMouseButton(0))
        {
            Vector3 aimPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.transform.position.y));//目标位置 .
            Vector3 dir = (aimPos - transform.position).normalized; //方向.

            Quaternion targetRotation = Quaternion.LookRotation(dir, Vector3.up);
            Quaternion newRotation = Quaternion.Lerp(m_rigid.rotation, targetRotation, rotateSpeed * Time.deltaTime);
            m_rigid.MoveRotation(newRotation);

            if (Vector3.Distance(aimPos, transform.position) > 0.1f)
            {
                m_rigid.MovePosition(dir * Time.fixedDeltaTime * moveSpeed + transform.position);
            }
        }
    }