I did install fc and netgen with sw manager but I have not added any links yet. Things seem to work fine when I start fc from a shell with LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/netgen freecad & No partial meshes or any other problems as far as I've seen so far. So the problem is just when I ...

As of end January 2021 this is a problem in FreeCAD 0.18.4 distributed in Linux Mint 20.1 Ulyssa which seems to be the same as for Debian based system as described at https://wiki.freecadweb.org/Installing_on_Linux#Debian_and_other_Debian-based_systems . The message is >>> import MeshPart Traceback ...

Thats a very ambitious system. I imagine that it took quite a while to reach it's current state. Yes, the R system was custom built over many years, and a lot of it well before the tools that are available now. I actually have a few questions about your project. What tool chain do you imagine? I co...

(I'm a freecad newbie so I may be wrong on details, and sorry this is so long.) I think the testing mechanisms mentioned will rely on the developer also developing the tests, so I would like to draw your attention to other models. The main idea is to put in place a system which makes it easy for use...

But don't those all mean starting the last operation over, or maybe even things before it? I am trying to understand a situation where you would actually want the result (the not valid object) from an algorithm. That is, an example where you actual fix the object rather than fixing the process that...

That depends on the algorithm and where and when it broke doing what. Sometimes changing parameters to a function is the route to success, sometimes you have to change the approach and sometimes there's just nothing that can be done. But don't those all mean starting the last operation over, or may...

if you wanted to fix your shape this is the kind of behaviour you want - so, yes, I do think this is normal/the better approach than just throwing an exception. Ok, now I'm confused about two things, the first is a real newbie question. Do you distinguish "fix your shape" from re-doing th...

[using 0.18.1 and 0.19R16786 on Mint 18.1 xenial with python 2.] Here are a few quick examples where a not valid object is returned but there is no warning or error thrown. import Part from FreeCAD import Base V= Base.Vector r3 =Part.Circle().toShape().revolve(V(0,0,0),V(1,0,0), 180) r3.isValid() #F...

Your response suggests this is not a commonly recognized behaviour. If that's correct then this may be a bug rather than expected. One example is discussed on this thread https://forum.freecadweb.org/viewtopic.php?f=22&t=36282 the last few days. I'm working through more details but am trying to ...

It seems to me to be a mistake to return an object which is not valid, and especially not to signal it with an error or warning. I would think returning None and signalling an error would be more usual when an invalid object results. Since this seems to be a feature of freecad, I'm wondering if ther...