各位大神，我这个三维设备求重心的命令为什么有时候行，有时候显示错误？
(defun c:zhongxin()(vl-load-com)
(alert "请选择所有的三维实体")
(setq ss (ssget '((0 . "3Dsolid"))))
(command "_union"ss "")
(setq pt (vlax-safearray->list (vlax-variant-value (vla-get-centroid (vlax-ename->vla-object (entlast))))))
(command "point" pt )
(command "circle" pt 500 )
(princ)
)
没关捕捉？
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