063 Fix Archicad GDL Story Display ac_toplevel

Why do GDL objects in Archicad show on the wrong stories, or disappear completely? It usually comes down to ac_bottomlevel and ac_toplevel, and how Archicad interprets your object’s vertical range. Using a simple test object, I demonstrate how incorrect values cause objects to disappear or appear on the wrong levels, and how to fix it by properly defining the vertical range in your parameter script. I also walk through: The relationship between ac_toplevel and ZZYZX Why Archicad’s behaviour can seem inconsistent How bounding boxes are calculated (and why they don’t always match expectations) Practical examples of controlling story display in real objects Once you understand this, you can control exactly where your objects appear - instead of fighting Archicad’s defaults. Completed in Archicad 29. Time Codes: 00:00 Problem: Object showing on wrong stories 01:11 What ac_bottomlevel & ac_toplevel do 02:04 Demonstration with test object 02:40 Test object setup 09:22 Relationship with ZZYZX 11:04 Bounding box behaviour explained 12:46 Summary 13:27 Real-world examples 15:27 Wrap-up Key Concepts Archicad GDL story display ac_bottomlevel and ac_toplevel explained GDL object vertical extent Show on Relevant Stories behaviour Bounding box calculation in Archicad Related If you’re building GDL objects, understanding how Archicad interprets them is critical to making them reliable in documentation. If you found this useful, consider subscribing for more practical Archicad + GDL workflows. Links Other videos:    • 035 Archicad GDL Dynamic Hotspots   Online help: https://gdl.graphisoft.com Community Forum: https://community.graphisoft.com GDL forum: https://community.graphisoft.com/t5/G... Intro & Outro music: "Cool Intro" & “Beauty Flow” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b...