Dimensions after Offset - BUG!

[Beyondforce]

Hey guys,

I need your feedback. It seems like a bug, I know that because I have done this before and there was not problem. I need one of you to try it and confirm it. I have attached the file as well. Thanks!

Cheers / Ben
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[HughesTooling]

I've been seeing this sort of problem a lot recently, I don't think it has anything to do with the curves being offset, I think it just the dimension pushing the curves around. I've attached a screencast that shows modifying a simple sketch makes the sketch "Flip". I obviously made the sketch without any problems about a month ago, now modifying dimensions, not just the one in the screencast and it jumps all over the place. After stopping the screencast I tried to change the 5mm dimension to 5.25 and the same thing happened.

Mark

[Beyondforce]

I have seen this "Flip" thing before, this is really Bizar! Maybe it's just a Winter virus 😉

[Anonymous]

It's something with constraints. If I remove them dimensions will work without side effects. But with them in place, even adding some other geometry will lead to the same effect as dimensions do.

[Beyondforce]

@Anonymous, Thanks for checking this out.
Well it does seems like a bug, since I'm not trying to change the dimension, I'm just trying to add dimension so the geometry won't change.
The contains shouldn't be an issue, that's definitely a bug!

[Anonymous]

Even more! I was able to get the same effect the original sketch. No projecting, offsetting, etc. Just add by adding Tangent constraint.

[Beyondforce]

Well, let's see what the guys from the Fusion team have to say about that.

@jeff_strater, I'll appreciate your feedback.

[Anonymous]

Here is the reduced test. Definitely weird.

[Beyondforce]

Great job! I have just created a new post with a new bug. Please let me know, if it's happening to you as well.
https://forums.autodesk.com/t5/design-validate-document/bd-p/124

[paul.clauss · Accepted solution]

Hi @Beyondforce, @Anonymous, @HughesTooling

Thanks for bringing this to our attention! I have logged a bug for the issue that @Anonymous broke down very well in his screencasts as FUS-30268. I will keep you updated as I hear more from development - in the meantime I would recommend applying tangent constraints after dimensioning the sketch entities, as it seems to lead to this issue occurring less often. Unfortunately, I was unable to find a workaround to eliminate the issue from occurring in the reduced example even after fully locking down the arcs and their endpoints with sketch constraints and dimensions, shown in the screencast below. Eliminating the tangent constraints or trimming the excess curves should allow you to work around this issue in your original sketch (from the first post/ screencast), though.

Please let me know if you have any other questions - I'm happy to help!