I am working on a Cad file, the map of a city. The lines, polylines, hatch, splines, blocks, text, they all have different Z coordiantes.
 
To bring them all to level zero, I tried the following:
- Flatten objects
- Move objects to 0,0,1e99 and then 0,0,-1e99
 
Neither worked. I also tried selecting everything and changing property to set Z coordinate to 0, but it's apparently not possible as they are different object types!
 
If anyone has tried and solved this problem, please help me! 

I hade some time ago lisp file which could bring all objects to z=0
I wil try find it for you

I have got one:
http://www.cadcorner.ca/lisp.php
lisp is call: flat.lsp

Thanks, found the command but don't know how to use it

Load flat.lsp using the APPLOAD command in AutoCAD.  Once it is loaded type the word flat at the command line to start the routine.


John Connor2011-05-12 11:49:06

I have found a method on a french site "top quiz des galères autocad" and it works like this :
 
move all the objects from 0,0 to 0,0,1E99 ( "E" not "e" )
then move all the objects from 0,0,1E99 to 0,0,0
 
I use it to work on topografic files with ground curves at different levels and it works fine ( it solves the problems of chamfers betwwen lines etc... )

I would think the "e" would work either way.  Why would it be case sensitive?

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Different methods to flatten entities with varying Z-coordinates to Z=0. 

Via
a macro (Source: CADforum)

 

Add
a new macro (icon) to your toolbar - in fact two single-line macros (tool
buttons) - one for selected objects and the second for all objects:

  [FlattenSel]^C^C_UCS;;_select \_move _p;;0,0,1e99;;_move _p;;0,0,-1e99;; [FlattenAll]^C^C_UCS;;_move _all;;0,0,1e99;;_move _all;;0,0,-1e99;;_chprop;_all;;_thickness;0;; 

(keep the macro text on a single line; the displayed format is to
be used for old MNU/MNS files - if you add the macro through the new CUI dialog, use just its code
starting with ^C)

Do not use it on
3D solids as it may distort them.

(original
concept by Randy Richardson)

* * * * * * * *
* *

Using
FLATTEN.LSP as originally written by Mark Middlebrook with improvements by
Vladmir Livshiz.

FLATTEN.LSP sets
the Z-coordinates of these types of objects to 0

;;; in the World
Coordinate System:

;;;  "3DFACE" "ARC"
"ATTDEF" "CIRCLE" "DIMENSION"

;;;  "ELLIPSE" "HATCH"
"INSERT" "LINE" "LWPOLYLINE"

;;;  "MTEXT" "POINT"
"POLYLINE" "SOLID" "TEXT"

[add link to
Flatten.lsp here]

 * * * * * * * * * *

In full AutoCAD
one can go to Express Tools and use the FLATTEN OBJECTS command which can be
found in the Modify section.

* * * * * * * *
* *

Some users have
suggested using the FLATSHOT command available in full AutoCAD.

* * * * * * * *
* *

And an “oldie
but goodie” from “back in the day” is the CHANGE command and its ELEVATION
option.