GDL object and Graphic Override

[TJR]

Hi, everyone.

When I work on urban plan studies we normally use fills to draw the plots, buildings etc. and then give these Element-ID's to be able to override de buildings colour for specific plan views. building type etc etc. And after we have the 2D plan we model a basic 3D plan too. 

So i was thinking about making an GDL object where it has a plot and building volume in 2D/3D in one go. 

Now I seem to have hit a roadblock that seems like I can't give for example the building(gray fill) a unique ID or property which I can override with graphic override. It will always override the whole object?

Is it correct that this is not possible within a GDL object or is there a way to make this happen?

 Thanks!

Operating system used: Windows

[CosminF]

Why not use a slab instead of a fill? And there you can solve your two subsequent points: 1. having a 3D model at hand, once you draw the site plan 2. having the ability to make use of graphic overrides. 

It may be slightly more time-consuming upfront (once you set up everything) but at least, for me, the reward/effort ratio makes it worthwhile.