Less than three points polygon

[Christophe Fortineau]

I've got this message since few days : "Less than three points polygon"

All my Windows are referenced in the Archicad 22 file rapport with this kind of message :
"Less than three points polygon :
at the 5252th line into the 3D script about WallholeCut.gsm file (WINDOW-002)
at the ..."

I use AC22 with its library wich is well linked
I'm on macOS 10.13.6 and it's thé first time I read this kind of message

Any Idea ?

[Christophe Fortineau]

Hello,

Without answer I have save as AC21 and clean all AC22 libraries and favorites.
Today I can work on AC21 😕 but with a clean file project.
No french forum help me as I write these words and hope your feedback.

Have a great day !

[Anonymous · Accepted solution]

Hi Christophe,

Your windows are standard AC or custom?
Have you tried to do an "Open and Repair" to the file?

[Christophe Fortineau]

Hello Braza,

I've tried to repair my AC22 file and it's a sucess.
Thanks a lot. I hope my project will stay all right.
Whithout understanding why and how it works !

Again thanks Braza about this simple but great solution !

[Anonymous]

I'm glad it helped.
Luckily or Unluckily I have been using "Open & Repair" too much times than I would like.
Perhaps this "Less than three points polygon... on WallholeCut.gsm" is due to some zero dimension in any of your windows...

[Nader Belal]

@Christoph Fortineau

A simple, easy and quick explanation (not only for you😞

A Polygon by definition is like a surface (same applies to 3D graphics or math) and to define it you need a minimum of three points (two points can only define a straight line, just try that with a pen and paper)

So the error message in human language is saying,
I can not draw a surface with less than 3 well defined points.

So you have to see:
1. If that polygon definition have a 3 well defined point.
2. If there is a faulty script procedure that have lost one of these points (may be a parameter value, an array, or not working stacking).
3. If one of those points were used to define the centre of an arc, which although it's a point by human standards, it can not close the perimeter of a given surface, and therefore even you have it scripted ArchiCAD will always count that surface as lacking one.
4. One of two points are coincident, and here sometimes the GDL editor can give an error message or can omit giving you the error message.

[Christophe Fortineau]

Hello Moonlight,

Thanks about your answser but I have not change any code into the archicad library object and I had just changed windows and doors sizes. I understand there is gdl code behind but I don't understand why I had this mistake. Today no more problem since I repair my AC22 file.