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A couple of comments..
By freezing unwanted layers, the speed is increased. It really doesn't
matter how many layers you have as long as you have the ability to view the
layers that are important to you. I think the layer filter feature in Acad
is way underutilized and, beginning with R14, the layer list on the layer
control toolbar will show only the layers that match the filter criteria.
This is pretty cool for someone like me who uses a lot of layers.

There are a lot of layer management utilities out there including a lot of
layer management improvements with R14. Softdesk Core and Productivity tools
is my utility of choice. I'm able to freeze layers on an XRef file without
having to know the name of the file. I believe this feature is in the R14
bonus layer tools package as well.
R14 also now has an icon to "make current layer" whereby one selects an
entity and the current layer is changed to the layer of that entity. Pretty

I didn't know that Acad had a release 5.0. I thought they went from version
2.5 something to version 9.

Bill Allen

P.S. - If you're going to be a cynic, you can't have thin skin :o). If
anyone has a topic that has been met with apathy, call me. I stir up

-----Original Message-----
From: Roger Turk <73527.1356(--nospam--at)>
To: BlindCopyReceiver:;;;;
Date: Tuesday, October 28, 1997 9:36 AM

>It seems that with CAD, AutoCad in particular, layering standards are the
>most controversial and non-standard.  This topic was bantered about (to
>borrow a phrase) in both Cadalyst Magazine and Cadence Magazine several
>ago, as well as in architectural magazines (with National, California and
>Hawaii AIA's recommending different standards), ASCE, and the various
>to name a few.  In addition, each office, even if they "adopt" a *standard*
>layering system, will frequently also have in-house standard layers.
>One of the things that clutters up a .DWG file is the unused layers.  If
>have *all* of *your* layers on your prototype drawing and *all* of all of
>your clients' layers there also, you will have a very large .DWG file to
>begin with.  (You will have a very large file even if you have only that
>client's architectural layers and your structural layers.)
>Several years ago I started on a AutoLisp routine, SL.LSP (for Select
>that uses a .LST file for layer data with my layers in the default file,
>MYLAYERS.LST, with the intention that the layering system of any of my
>clients would be installed in their list, e.g., CAAIA layering system would
>be in CAAIA.LST, Arizona DOT's layering system would be in ADOT.LST, etc.
>The only layers on my prototype drawing are 0 (zero) and OUTL0.  As I need
>other layers, I select them from MYLAYERS.LST; if I create a new layer, the
>routine gives me the opportunity to add that layer to the list or just to
>drawing.  The list has linetype, color (pen) and all the information that
>needed for a layer.  One *BIG* problem that I have is that AutoLisp's
>cannot be created with a text editor as the list *cannot* end with a
>(Any additions to the list would be added after the CTRL-Z, and would not
>accessible to the AutoLisp routine.)  Therefore, all input to the list must
>be made from within AutoCad using AutoLisp.
>Unfortunately (or fortunately) my architectural clients have not gone to
>AutoCad, so I have not been constrained with their layering standards, nor
>have I had to create a list for their standards.
>Like any routine, SL.LSP must be considered as unfinished and subject to
>constant change.
>BTW, as an AutoCad user from Version 5.0 to Release 12, scripting has been
>available in all of these releases.
>A. Roger Turk, P.E.(Structural)
>Tucson, Arizona