CAD Forum - tips, tricks, discussion and utilities for AutoCAD, Inventor, Revit and other Autodesk products [www.cadforum.cz]

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 7943×

Comments Tell a friend

Prices - CAD eShop:

AutoCAD

applies to: AutoCAD ·

Back All CAD Tips

Why are cursor crosshairs rotated even if I have world UCS and plan view? « | » Is it possible to change the function of the F1 key?

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link:

CAD: OS: Categ:
Text:	FAQ glossary

Featuring:
Export 3D VRML scenes from AutoCAD and Inventor
VRMLout More info

Please use these tips at your own risk.
CAD Studio is not responsible for possible problems that may occur as a result of using any of these tips.


Login/Register:
Visitors: 3357