topic Opening behaving badly.. in Modeling

Opening behaving badly..

Graeme — Mon, 18 May 2026 11:25:27 GMT

I've used the Opening tool to add holes for ductwork through my partitions. What is weird is that a lot of these Openings are behaving badly or weirdly as their width and height are swapped around and I can't find a reason why.

The screenshots show two openings one behaving correctly and the other with the weird behaviour namely when you enter the width the height changes and same if you enter the height the width changes.

Re: Opening behaving badly..

Graeme — Mon, 18 May 2026 14:11:17 GMT

Hmm may have found what is doing it. When I use the "Create Openings" palette the ressulting opening has the flipped width and height. Whereas when I just use the syringe tool and then place an Opening manually it works fine.

Would be nice if anyone else in AC28 gets the same result.

Re: Opening behaving badly..

marcoariveross — Mon, 18 May 2026 15:14:21 GMT

Hi
If you look closely, there's no such error.
Your elements are rotated. If you place an opening in two elements with different orientations in plan and/or 3D, you'll obviously see a different graphical representation. The dimensions are based on the element's plane, not on the view from a higher plane.