CAD法向Z坐标 -1改为1 如何修改才能实现

(defun c:fsz (/ ss za mat n)
(vl-Load-com)
  (setq ss (ssget))
  (if ss
    (repeat (setq n (sslength ss))
      (setq obj (vlax-ename->vla-object (ssname ss (setq n (1- n)))))
      (setq ZA (vlax-safearray->list
                 (vlax-variant-value (vla-get-Normal obj))))
      (setq mat        (vlax-tmatrix
                  (list
                    (list 1 0 (car ZA) 0)
                    (list 0 1 (cadr ZA) 0)
                    (list 0 0 (caddr ZA) 0)
                    (list 0 0 0 1)
                    )
                  )
            )
      (vla-TransformBy obj mat)
      )
    )
  )
(princ "\n加载法向Z坐标归1:Fsz \n")
(princ)