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Flatten Z Cooridnate

Flatten Z Cooridnate

Does someone out there have a LISP that will change all of the Z cooridates to equal zero? I have AutoCAD 2000 if that makes a difference. I would appreciate it -


RE: Flatten Z Cooridnate

This is a good routine

;;; FLATTEN.LSP version 2k.01, 25-Jun-1999
;;; FLATTEN sets the Z-coordinates of these types of objects to 0
;;; in the World Coordinate System:
;;; copyright 1990-1999 by Mark Middlebrook
;;; Daedalus Consulting
;;; e-mail:
;;; Thanks to Vladimir Livshiz for improvements in polyline handling
;;; and the addition of several other object types.
;;; You are free to distribute FLATTEN.LSP to others so long as you do not
;;; charge for it.
;;; Revision history
;;; v. 2k.0 25-May-1999 First release for AutoCAD 2000.
;;; v. 2k.01 25-Jun-1999 Fixed two globalization bugs ("_World" & "_X")
;;; and revised error handler.
;;;*Why Use FLATTEN?
;;; FLATTENing is useful in at least two situations:
;;; 1) You receive a DXF file created by another CAD program and discover
;;; that all the Z coordinates contain small round-off errors. These
;;; round-off errors can prevent you from object snapping to
;;; intersections and make your life difficult in other ways as well.
;;; 2) In a supposedly 2D drawing, you accidentally create one object with
;;; a Z elevation and end up with a drawing containing objects partly
;;; in and partly outside the Z=0 X-Y plane. As with the round-off
;;; problem, this situation can make object snaps and other procedures
;;; difficult.
;;; Warning: FLATTEN is not for flattening the custom objects created by
;;; applications such as Autodesk's Architectural Desktop. ADT and similar
;;; programs create "application-defined objects" that only the
;;; application really knows what to do with. FLATTEN has no idea how
;;; to handle application-defined objects, so it leaves them alone.
;;;*How to Use FLATTEN
;;; This version of FLATTEN works with AutoCAD R12 through 2000.
;;; To run FLATTEN, load it using AutoCAD's APPLOAD command, or type:
;;; (load "FLATTEN")
;;; at the AutoCAD command prompt. Once you've loaded FLATTEN.LSP, type:
;;; to run it. FLATTEN will tell you what it's about to do and ask you
;;; to confirm that you really want to flatten objects in the current
;;; drawing. If you choose to proceed, FLATTEN prompts you to select objects
;;; to be flattened (press ENTER to flatten all objects in the drawing).
;;; After you've selected objects and pressed ENTER, FLATTEN goes to work.
;;; It reports the number of objects it flattens and the number left
;;; unflattenened (because they were objects not recognized by FLATTEN; see
;;; the list of supported objects above).
;;; If you don't like the results, just type U to undo FLATTEN's work.
;;;*Known limitations
;;; 1) FLATTEN doesn't support all of AutoCAD's object types. See above
;;; for a list of the object types that it does work on.
;;; 2) FLATTEN doesn't flatten objects nested inside of blocks.
;;; (You can explode blocks before flattening. Alternatively, you can
;;; WBLOCK block definitions to separate DWG files, run FLATTEN in
;;; each of them, and then use INSERT in the parent drawing to update
;;; the block definitions. Neither of these methods will flatten
;;; existing attributes, though.
;;; 3) FLATTEN flattens objects onto the Z=0 X-Y plane in AutoCAD's
;;; World Coordinate System (WCS). It doesn't currently support
;;; flattening onto other UCS planes.

(defun C:FLATTEN (/ tmpucs olderr oldcmd zeroz ss1 ss1len
i numchg numnot numno0 ssno0 ename elist
etype yorn vrt crz
(setq tmpucs "$FLATTEN-TEMP$") ;temporary UCS

;;Error handler
(setq olderr *error*)
(defun *error* (msg)
(if (or
(= msg "Function cancelled")
(= msg "quit / exit abort")
;;if user cancelled or program aborted, exit quietly
;;otherwise report error message
(princ (strcat "\nError: " msg))
(setq *error* olderr)
(if (tblsearch "UCS" tmpucs)
(command "._UCS" "_Restore" tmpucs "._UCS" "_Delete" tmpucs)
(command "._UNDO" "_End")
(setvar "CMDECHO" oldcmd)

;;Function to change Z coordinate to 0

(defun zeroz (key zelist / oplist nplist)
(setq oplist (assoc key zelist)
nplist (reverse (append '(0.0) (cdr (reverse oplist))))
zelist (subst nplist oplist zelist)
(entmod zelist)
(setq oldcmd (getvar "CMDECHO"))
(setvar "CMDECHO" 0)
(command "._UNDO" "_Group")
(command "._UCS" "_Delete" tmpucs "._UCS" "_Save" tmpucs "._UCS" "_World")
;set World UCS

;;Get input
"\nFLATTEN sets the Z coordinates of most objects to zero."

(initget "Yes No")
(setq yorn (getkword "\nDo you want to continue Y>: "))
(cond ((/= yorn "No")
(prompt "\nChoose objects to FLATTEN ")
"[press return to select all objects in the drawing]"
(setq ss1 (ssget))
(if (null ss1) ;if enter...
(setq ss1 (ssget "_X")) ;select all entities in database

;;*initialize variables
(setq ss1len (sslength ss1) ;length of selection set
i 0 ;loop counter
numchg 0 ;number changed counter
numnot 0 ;number not changed counter
numno0 0 ;number not changed and Z /= 0 counter
ssno0 (ssadd) ;selection set of unchanged entities
) ;setq

;;*do the work
(prompt "\nWorking.")
(while ( i ss1len) ;while more members in the SS
(if (= 0 (rem i 10))
(prompt ".")
(setq ename (ssname ss1 i) ;entity name
elist (entget ename) ;entity data list
etype (cdr (assoc 0 elist)) ;entity type

;;*Keep track of entities not flattened
(if (not (member etype
(progn ;leave others alone
(setq numnot (1+ numnot))
(if (/= 0.0 (car (reverse (assoc 10 elist))))
(progn ;add it to special list if Z /= 0
(setq numno0 (1+ numno0))
(ssadd ename ssno0)

;;Change group 10 Z coordinate to 0 for listed entity types.
(if (member etype
(setq elist (zeroz 10 elist) ;change entities in list above
numchg (1+ numchg)

;;Change group 11 Z coordinate to 0 for listed entity types.
(if (member etype
(setq elist (zeroz 11 elist))

;;Change groups 12 and 13 Z coordinate to 0 for SOLIDs and 3DFACEs.
(if (member etype '("3DFACE" "SOLID"))
(setq elist (zeroz 12 elist))
(setq elist (zeroz 13 elist))

;;Change groups 13, 14, 15, and 16
;;Z coordinate to 0 for DIMENSIONs.
(if (member etype '("DIMENSION"))
(setq elist (zeroz 13 elist))
(setq elist (zeroz 14 elist))
(setq elist (zeroz 15 elist))
(setq elist (zeroz 16 elist))

;;Change each polyline vertex Z coordinate to 0.
;;Code provided by Vladimir Livshiz, 09-Oct-1998
(if (= etype "POLYLINE")
(setq vrt ename)
(while (not (equal (cdr (assoc 0 (entget vrt))) "SEQEND"))
(setq elist (entget (entnext vrt)))
(setq crz (cadddr (assoc 10 elist)))
(if (/= crz 0)
(zeroz 10 elist)
(entupd ename)
(setq vrt (cdr (assoc -1 elist)))

;;Special handling for LWPOLYLINEs
(if (member etype '("LWPOLYLINE"))
(setq elist (subst (cons 38 0.0) (assoc 38 elist) elist)
numchg (1+ numchg)
(entmod elist)

(setq i (1+ i)) ;next entity
(prompt " Done.")

;;Print results
(prompt (strcat "\n" (itoa numchg) " object(s) flattened."))
(strcat "\n" (itoa numnot) " object(s) not flattened.")

;;If there any entities in ssno0, show them
(if (/= 0 numno0)
(prompt (strcat " ["
(itoa numno0)
" with non-zero base points]"
"\nPress enter to see non-zero unchanged objects... "
(command "._SELECT" ssno0)
(getstring "\nPress enter to unhighlight them... ")
(command "")

(command "._UCS" "_Restore" tmpucs "._UCS" "_Delete" tmpucs)
(command "._UNDO" "_End")
(setvar "CMDECHO" oldcmd)
(setq *error* olderr)

"\nFLATTEN version 2k.01 loaded. Type FLATTEN to run it."


RE: Flatten Z Cooridnate

You can use the MOVE trick for flattening (Z=0) 3D entities - even in AutoCAD LT. See - ; -- search for FLATTEN


RE: Flatten Z Cooridnate

The description of the flatten.lsp sounds great. However, I did not find a link to download the file. Could anyone help find it.

Thank you,


RE: Flatten Z Cooridnate

Does anyone know of a lisp that will do the opposite os flatten, i mean, that will read the numbers that define the z coordinate an then pick the points and "lift" them to that coordinate? I would much apreciate if someone could give me that information: the lisp, or somewhere where i can probably find it.
Thank you.

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