CAD tip # 11179:

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CAD

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Select objects in negative elevation or in a given 3D octant.

Using the LISP filter "-4" you can easily select DWG objects, which have their definition/reference point above or below a given limit set on the individual X,Y,Z components of their coordinates. So you can select/filter objects with a reference point in a positive or negative Z-elevation, or in the positive XY half-space, or in the positive XYZ octant.

See examples of selecttion sets (can be input on the "Select objects:" prompt)

Negative Z-elevation:
(ssget "_X" '((-4 . "*,*,<")(10 0 0 0)))

Positive XY half-space, any Z:
(ssget "_X" '((-4 . ">=,>=,*")(10 0 0 0)))

Positive XY half-space, only "zero" Z (flat):
(ssget "_X" '((-4 . ">=,>=,=")(10 0 0 0)))

Positive octant XYZ:
(ssget "_X" '((-4 . ">=,>=,>=")(10 0 0 0)))

You can also combine the filters through AND, OR, NOT. Please note that only the reference point is checked (e.g. a circle center, polyline starting point), not the whole bounding box of a drawing entity.

ACAD

*CAD

22.11.2016 7573×

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this tip shared by ARKANCE experts applies to: AutoCAD ·

See also:
Tip 14620:	Converting object data (OD) to XData (XD) in AutoCAD Map 3D.
Tip 13737:	Formatting leading zeros in AutoCAD fields (and automatic field update).
Tip 13716:	HYPERLIST - list of all used URLs.
Tip 13688:	How to select all DWG objects of a certain type in AutoCAD LT? (texts, circles...)
Tip 13049:	Bulk 3D rotation of selected objects around individual axes.

Selected tip: Find a point in a 1/4 or 1/3 distance between two points (smart M2P).

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