Door Arc Extrusion Inconsistent Across Different Widths

[hugo_mpt_almeida]

Hello.

Hello,

I’m creating a door family with an arched top. The door needs to be flexible in width, but I want the arc to always keep the same height, regardless of how wide the door is. The intended height of the arc should match the exterior frame, which is 150.

The problem is that when the door width increases, the arc height also increases.

Here’s an example of how the door currently looks:

I tried constraining the arc height with a dimension, but when I do that, the arc displays correctly in the family editor but disappears in the project file. Oddly enough, the path of the extrusion is still there, but the geometry doesn’t show.

Has anyone run into this issue before? How can I keep the arc height fixed while allowing the width to change? Thanks in advance.

[s_dziedzicBJXBG]

Your arc is a segment of a circle. Do you want it to remain the same regardless of the door width, or should it be a segment of a larger circle? First option: simply align and lock it to reference planes. Second option: you’ll need to use formulas and quite a bit of trigonometry.

https://help.autodesk.com/view/RVT/2024/ENU/?guid=GUID-BA812528-8000-44A5-B53F-137B3F642107

[Mike.FORM · Accepted solution]

Split the arc sketch line into 2 segments so you can lock the arc to the center/top ref planes.

[hugo_mpt_almeida]

Thank you! This worked.
I didn't know I could add reference planes inside the path drawing view, I though I could only use them in the broader view.