Well, you know, the one thing you can say about ArchiCAD is that if there isn't a direct way of doing something, there's almost always an indirect way.
😉
The attached shows a quick (no time taken to adjust params) sketch engine image for a floor plan. Vintage 52 defaults.
Someone else gave this tip on the old escribe ac-talk so long ago I can't recall who it was to acknowledge them:
-Display the plan as you want to have it sketched.
-Save as DWG.
-From File > GDL open the DWG as a GDL object.
-Place the object, select it, and view it in 3D. You'll see your plan as 3D linework.
-Finally, adjust your camera to a top view and generate your sketch render.
Voila.
Also, see Cigraph's ArchiSketchy add-on:
http://www.archisketchy.com/
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB