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Tips to Help Flatten Objects
Tip# 4335 By Danny Korem On 07-Jul-2014
Rated By 0 users
Categories : Object Properties
Software type : AutoCAD 2015
Rename File To : No Files to download.
These tips will help you keep new objects flat and move existing objects to the zero elevation.

Do you wish everything were flat? If you get a drawing file which you attach as an external file, and then you object snap to an endpoint or any other snap, you might catch some z coordinates along the way. Many people ask how to flatten objects, so is the answer:

Go to Options > Drafting and Opt for "Replace Z value with current elevation." (Autodesk needs to be a bit more explicit and replace "current elevation" with "current UCS.") So any Z=0 UCS counts. From now on all z values will be filtered to 0’.

Go to Select All > Properties and change the values manually for each object: Start and end z for lines, center z for arcs and circles, elevation for polylines, etc.

Dimensions are the most difficult to flatten because they have to be moved from their actual position to their reflected position at the UCS plane. If objects are flattened and your dimensions are associative, turn on the Annotation Monitor to find out whether or not your dimensions are associated. When reassociated, they’ll move to the Flatten Objects plane.       

Notes from Cadalyst tip reviewer R.K. McSwain: Danny brings up some good points regarding keeping new objects flat (at an elevation of 0.0) and moving existing objects to the zero elevation. You may be familiar with the Flatten command, but if you chose this method, use it with caution because it can do some unexpected things. Danny’s methods listed here give you predictable results. See also a couple of related CAD tips, #3903 and #4189.


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User comments
Comment by Shehata,Tawfik
Posted on 2014-07-07 00:28:25
This tip sets the "OSNAPZ" to 1, however, this value will - for some reason - be set back to 0 (The tick box will be unchecked) once you end the AutoCAD session, so it will need to set again every time you start AutoCAD.
Comment by Alexander,Ron
Posted on 2014-07-08 10:20:03
I have just typed the word FLATTEN in Command line after zoom extents then window the drawing space to Flatten Z's. It was a command from Land Develoment desktop.