On Land

Environment Information
At Rill Architects we run ArchiCAD on Mac OS X. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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Several different kinds of change, which may overlap. New versions mean new workflows, and that means layer changes.

We have implemented Renovation in new projects. In a new project, the only existing elements will be site-related: The site mesh, driveways, trees, etc. This means we can eliminate the few remaining layers with .E and .D extensions. In fact, all extensions are now eliminated. Maybe we will find a new use for extensions in the future.

Prefix Changes and Name Tweaks

These are prefix changes to better reflect work domain (C Civil, F Finish, etc.), or to clarify whether elements are real or annotations. Layers for real things start with a letter. Annotation layers have a plus sign before the letter. Some words are changed to more standard terms.

C Site3, formerly L Grade3 (The site is Civil, not Landscape. 'Site' is more standard.)
C Site3 Existing, formerly L Grade3.E
C Site3 More, formerly L Grade Big
C Site2, formerly +C Site Line.E (Boundaries, easements, etc. are real)
C Topo New, formerly +C Contour (Topo is real, and 'Topo' is more standard)
C Topo Existing, formerly +C Contour.E
+C Site Line is deleted.
F Counter and F Cabs3, formerly A Cabs2 and A Cabs3. As I was organizing the new favorites by discipline, it became clear that cabinets and counters are finishes. See below about what happened to Cabs2.

Demolishing Trees

These changes result from using Renovation to remove trees:

L Tree2, formerly L Tree2.E
L Tree2.D is deleted
L Tree3, formerly L Tree3.E
L Tree3 (old version) is deleted
L Tree A is deleted (Use +L Floor Plan Line)

Clearer Electrical Names

The electrical fixture layers have new names solely for clarity. The layers are the same. You can review why so many electrical layers.

E Symbol2, formerly E Fixt2
E Wall Fixture3, formerly E Fixt3
E Ceiling Symbol2, formerly E Fixt Clg2
E Ceiling Fixture3, formerly E Fixt Clg3
E Ext Fixture3, formerly E Fixt Ext3
E Ext Clg Fixture3, formerly E Fixt Clg3

RCP Changes

Because of changes to reflected ceiling plans brought on by graphical overrides, there are several previously-hidden plan layers that are now shown in RCP, including F Counter, (formerly F Cabs2), A Stair2, A Soffit2, and A Ceiling2. The override rules are responsible for drawing these elements with a dashed line type. There are two layers that I'm not sure we need anymore, X SEO Show2 and A Ceiling All. I haven't deleted them yet, but I did unhook them from any favorites.

Also because of RCP changes, the former Cabs2 layer is now four layers:

F Counter, formerly F Cabs2, is only for counters. Overridden to dashed in RCP.
F Cabinet Base, new, is only for cabinets below counters. Hidden in RCP.
F Cabinet Upper, new, is only for upper cabinets. Overridden to solid line in RCP.
F Shelves, new, is pantry shelves, bookshelves, and other full height cabinetry. Shown solid line in floor plan and RCP.

Misc

X Cutting Roof is deleted. This was for hidden roofs used in old-fashioned cropping to roof. I haven't had a need for one of these operations in many years. I recently gave it a chance to see if it could solve a weird condition; it couldn't.

M Duct is a new layer for ducts created by the MEP modeler. If you're not modeling ducts, you can ignore it. You don't have to model ducts in order to place HVAC registers. Those go on the M Fixture layers.

S Frame Beam and S Frame Column are new layers for members in moment frames, so they can be isolated on the Wall Bracing plans.

A Appl can be A Appliance, there's plenty of room.

Filling Gaps

At the end of the layer list there are 13 (say what) new layers with names like ZZZ Future 130. These fill in gaps in the series of layer IDs. (The layer ID is only visible when using Attribute Manager.) By having these IDs occupied, when external content is merged from third parties, any new layers created will go to the end of the (ID) list, which should help remove ambiguity about which layers are ours or theirs. The ZZZ layers are hidden and locked in all combinations (even the zzz All combination, which shows and unlocks all the real layers). Because locked layers are hidden in lists, you should never encounter them in normal work.

If new layers are needed in the templates, we'll rename some of the ZZZ layers instead of creating new ones. If a new layer is needed for a project-specific case, not likely to be repeated, that can be created new. As usual, it is rare to truly need a new layer.

There is a new version of What Layer Things Go On.