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bug in roof surfacer

this is an old bug that just got repaired in version 16 but
has returned in version 17

ArchiCAD 4.5 --- 27 , Win 10 , dual monitors, 64 gb ram,Nvidia GeforceRTX 2080 TI, I-9
Not applicable
I'm getting the same anomaly, I guess it is a bug. The align with roof pitch setting has no effect.
Not applicable
This story never finishes.

For history, the culprit is poly2_b{2} command, which was broken in 16.
The failure of the roof accessory in 2D was a consequence of this bug.
The bug was noticed in July 2012, and fixed with hotfix 4 (3827), one year later.

In AC 16 (3827), poly2_b{2} command is repaired
Opening Roof Surfacer 16 (3827), you will see at line 46 (2D Script).
In AC 17, poly2_b{2} command is repaired… and Roof Surfacer 17 is broken again.
The previous line of code is missing.

As a temporary workaround, add this line at the begining of the 2D Script
Do a copy not to modify the original library. Wait for the next Library Hotfix.
Keep cool.
Laszlo Nagy
Community Admin
Community Admin
I will report this to Graphisoft.
Loving Archicad since 1995 - Find Archicad Tips at
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27
Barry Kelly
It's not just the roof surfacer object that is wonky.
Even just the materials with vectorial hatching on a multi-plane roof is wrong.
Single roof planes are fine.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11
Stress Co_
5 Hotfixes later….. and still not corrected.

Does this disclaimer mean it won't be fixed?
(from the "About "Roof/Slab/Wall Accessories" Add-On")
Screen Shot 2014-02-12 at 10.41.03 PM.png
Marc Corney, Architect
Red Canoe Architecture, P. A.

Mac OS 10.15.7 (Catalina) //// Mac OS 14.2.1 (Sonoma)
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ArchiCAD 25 (5010 USA Full) //// ArchiCAD 27 (4030 USA Full)
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