AC 24 IFC Bug Report from recipient

Anonymous — Wed, 18 Aug 2021 07:23:39 GMT

Dear AC community,

I received an IFC file originating from AC24 in 2x3 format.
It will not open in some software:
The reason is the misuse of Axis.

Where can I file a bug report without being an AC user? (upload the file?)

Lukas

citing:
The error message suggests that the creation of a grid's W axes failed:

self.create_grid_axes(grid.WAxes, w_axes, grid_obj)

To fix this, you can search for IfcGrid in the file, and use the IFC debug panel to create a shape on the grid axes until it fails. In particular, this grid, with this axis, with this polyline is the culprit:

#622480= IFCGRID('23uIUjAukv$NeSa166u94j',#30,'Raster 001',$,$,#622421,#622477,(#622462),(#622442),(#622452,#622432,#622422));
#622422= IFCGRIDAXIS('GG',#622427,.T.);
#622427= IFCPOLYLINE((#622423,#622425));
#622423= IFCCARTESIANPOINT((0.,0.));
#622425= IFCCARTESIANPOINT((0.,0.));

As you can see, the polyline is invalid with coordinates from 0 to 0. Just delete the grid axes and you can fix it. Also, please file a bug with Graphisoft so they can fix it.

I also suspect grids are misused here. ArchiCAD does not have a site boundary tool (crazy right?). As a result, many ArchiCAD users abuse grids to draw boundaries, which I think is the case here. This leads to invalid axes, using usages of "WAxes" where there shouldn't be.

Clearly, our industry has a long way to go before we can actually trust our BIM data.

Re: AC 24 IFC Bug Report from recipient

Laszlo Nagy — Sun, 22 Aug 2021 19:45:50 GMT

I will report this to Graphisoft HQ so they are aware of it.

topic AC 24 IFC Bug Report from recipient in Collaboration with other software

AC 24 IFC Bug Report from recipient

Re: AC 24 IFC Bug Report from recipient