Cannot set isFlipped property for columns via API

til0byte — Mon, 16 Feb 2026 00:31:35 GMT

Problem

I'm using ArchiCAD API 29.3100 to import columns from JSON. Columns with profiled asymmetric cross-sections appear mirrored after import because the isFlipped property cannot be set via the API.

What I'm trying to do:

element.column.isFlipped = true; ACAPI_Element_Create(&element, &memo);

ArchiCAD always sets isFlipped back to false during creation, regardless of what value I set.

I tested all combinations systematically:

angle=0°, isFlipped=true → Result: isFlipped=false

angle=360°, isFlipped=true → Result: isFlipped=false

I also tried fixing it after creation with ACAPI_Element_Change:

element.column.isFlipped = true; ACAPI_Element_Change(&element, &mask, nullptr, 0, true); // Returns NoError

But when I read the element back, isFlipped is still false.

The ACAPinc.h documentation lists modifiable column fields as: origoPos, axisRotationAngle

isFlipped is not listed, which suggests it might be read-only, but this isn't clearly documented.

Is this a known limitation?

Is there any way to set isFlipped=true via the API?

What's the recommended workaround for importing flipped profiled columns?

Any help would be appreciated!

Re: Cannot set isFlipped property for columns via API

Tamas Polyak — Fri, 20 Feb 2026 17:18:52 GMT

Hi,

I checked the code, and it looks like the isFlipped flag is used only one way, when getting a column, but not when creating or changing.

I'll look into it if it's a limitation or a bug, and if there's a workaround.

Regards,

Tamás

Re: Cannot set isFlipped property for columns via API

Tamas Polyak — Mon, 23 Feb 2026 17:33:16 GMT

Hi,

I've reported it as a bug. Unfortunately I don't see any workaround to place a column with flipped set.

Regards,

Tamás

topic Re: Cannot set isFlipped property for columns via API in Archicad C++ API

Cannot set isFlipped property for columns via API

Problem

Re: Cannot set isFlipped property for columns via API

Re: Cannot set isFlipped property for columns via API