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CAD tip # 2130:

Question CAD
% platform category

How to select objects with negative Z coordinate?

How to select AutoCAD entities laying under the "zero level" (Z=0, Z<0)?
Try the following SelNegZ LISP routine (you can e.g. hit Del to delete the selected objects):


;(C) CAD Studio - www.cadstudio.cz
;select objects with negative Z coordinate 

(defun C:SelNegZ ()
 (setvar "CMDECHO" 0)
 (command "_UCS" "")
 (command "_VPOINT" "0,-1,0")
 (command "_SELECT" "_W" (getvar "EXTMIN") (list (car (getvar "EXTMAX")) -0.000001) "")
 (command "_ZOOM" "_P")
 (sssetfirst nil (ssget "_P"))
 (setvar "CMDECHO" 1)
 (prin1)
)

ACAD

* CAD

25.4.2002 5458x

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applies to: AutoCAD ·

See also:
Tip 872:	How to move (flatten) entities with varying Z-coordinates to Z=0?

Selected tip: How to get the "prompt" property from "attribute" objects in VBA?

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