[groos]

It's what caused me to move away from FreeCad to OnShape. Never had an issue in OnShape but got hit with it every time in FreeCad. The sad thing is that there was a fork for a long time which had addressed this problem, and added other nice enhancements as well, but they never merged that work. I guess every org has political problems and FreeCad is no exception.

[hommelix]

The wiki page explains that as from Freecad 1.0, the work done by Realthunder in the topological naming problem has been merged into Freecad. Not that everything is solved. Just to mention that the work of Real thunder was not lost.

[groos]

Glad to hear it as I moved away before 1.0 happened. RealThunder had other enhancements as well, if I remember correctly. I wonder if those were taken up as well.

[Robotbeat]

This isn’t accurate. FreeCAD merged the main changes from that fork (RealThunder) to fix (well, mitigate) the problem. That’s the big thing with 1.0.

Although… as others have noted, this is a problem with basically all CAD packages, as on a fundamental level, it depends on user design intent. Just some have enough bandaids that it’s more rare.

[groos]

My statement was accurate as of _when_ I moved away from FreeCad. I'm happy they merged the RealThunder work. But they dilly-dallied for a long time while people were demanding a fix and one was available. Doesn't speak well of their org politics.

[mft_]

I’ve experienced similar problems (not totally sure if they were exactly the “topological naming problem” but certainly similar from the description) in Solidworks many times. Not usually a major problem - just a reworking or removal / re-adding of some features needed.

I’ve not encountered the same issue in FreeCAD 1.1 (to which I’ve transitioned recently). There are of course other frustrating niggles in FreeCAD, but not this one (yet).

[mitthrowaway2]

I had the same experience, but instead of moving away from FreeCAD to OnShape, I moved to the fork that you mentioned, by RealThunder. Works great! Eventually the main branch mostly caught up.

[embedding-shape]

How does OnShape handle that problem? The linked page seems to make the case that most CAD suffers from this, others just "hide" it better;

> This problem is not unique to FreeCAD. It is generally present in CAD software, but most other CAD software has heuristics to reduce the impact of the problem on users.

[throwup238]

Most CAD software have a mapping algorithm that remaps the new features to the old features after a topological restructure using a combination of topological id systems and heuristics.

Solidworks and Onshape don’t “hide” it better, their algorithms are better and break down in much more complex models than FreeCAD. Each one also tends to have its own quirks so as you learn to use the software you get a bit of intuition on how to best model certain features to avoid angering the topological naming gods.

I don’t think I’ve ever seen Solidworks break down in a simple model, it’s always been in complex shapes using advanced features.

[DecoPerson]

I think the word “solve” is better than “hide” here.

Fusion 360’s heuristics are so good that I rarely run into these problems. When I do, it’s usually because it was a drastic change to a previous feature in the timeline and I’m expecting to encounter issues because it’s a really fundamental change.