File Corrupted itself and all sketch geometries changed / moved resulting in odd shaped bodies

[patt.t.klein]

Hi, 
Not quite sure what do here, my fusion 360 file has corrupted itself. It looks like all my sketch files have changed geometry and position. All the resulting bodies that had been extruded have also been affected as a result.  

The section on the far right-hand side is uncorrupted, but as you can see the rest has gone rather weird. 
Has anyone experienced this before or have any ideas on how to to fix this? 
I have tried rolling back to previous versions, downloading the file off the cloud, and no luck so far. 

Also all other files that have had that file imported into it at some stage, but had the link broken/saved separately are also corrupted in the same manner. 

[patt.t.klein]

Hi, 
Is anyone able to help, or have ideas? 
I've run out of ideas on how to fix / repair this file and am rather stressed that I can't get it working again. 

[I_Megaman_i]

dont worry its not your fault. AD messed up. You should check your other projects just in case they are not broken.

[patt.t.klein]

Unfortunately, It doesn't really help me know that it's their fault. I now have a corrupt file that is being used as a build plan for a project I'm working on. 

Does anyone know if this issue is even fixable?? 

[TrippyLighting]

Can you share your model ?

[patt.t.klein]

https://a360.co/3qZpLm0

There is a yellow warning marker on the left side for a mesh, but that only appeared after the file went awol. 

[TrippyLighting]

Over the weekend I've come across two threads reporting similar issues.

Thread #1 

Thread #2

The models in these two threads share some of the same "properties" with your model.

Their timeline was broken by inadequate modeling techniques before the update. What I've suspected and then got confirmed by AD employees over the weekend is that in order to work with the new mesh workspace, the update checked where a mesh was present in the design and then performed a "Modify->Compute all" to update the mesh data.

That "compute all" resulted in highlighting all the errors in the design. The Senior Software Architect at Autodesk who helped track this down, also checked the model in Thread #1 and these error were present in the model before the update.

Your design has 27 warnings (yellow icons) and  123 errors.

 

[I_Megaman_i]

TrippyLighting yes, we already know there are a lot of "modelling errors", but that doesnt solve anything for anyone.

[patt.t.klein]

I don't remember seeing any of those errors before the file corrupted itself. I can see all the draft errors you posted, but they certainly wasn't there before the file changed. Looking through the file, almost every body that was drafted is now disfigured, and all of those drafts have been deleted by the program. Are you sure that all the errors are not from the file post corruption? 

The original drawing was a mesh import from Sketch up which I then traced and redrew as a sketch, so the original mesh file wasn't even used. 

The strangest thing is that the original body that was traced off the mesh is still intact and fine, yet the majority of the sketches that I drew onto that body and extruded are the corrupt ones. There doesn't seem to be any real correlation for the corrupted ones vs non corrupted as they were all sketched at the same time. 

Also as mentioned above, even if there are modelling errors, why would the file corrupt itself like that? Is there a way to recover the document or not?

[TrippyLighting]

You’ll have to start eliminating the timeline errors 1-by-1 starting with the earliest one.

The OP in the First thread also stated never having seen any warnings. I will continue to discuss that with my contacts at AD.

However, I’ve used Fusion 360 since late 2015. I’ve spent thousands of hours analyzing other users designs.

I’ve never not seen a warning after running a “compute all”.

[I_Megaman_i]

I dont believe its "corrupted", its only not showed properly by the current Fusion build, if we could install previous versions I bet everything will get back to how it was. Its been a week since I reported this to AD, and I am still waiting for someone to tell me whats going on and how to recover or not recover this.

[TrippyLighting]

1. The AD employee in your thread clearly explained to you what the problem was.

2. My contact at Autodesk checked one of the models in question with a previous version of Fusion 360 and those

modeling errors were already present in that model.

3. I’ve explained all of that already in posts above.

[I_Megaman_i]

1. yes, so? did he provide a solution or a guide? no

2. I dont believe you. any proof?

3. And I explained why you are not helping.

[patt.t.klein]

Thanks for the replies, 
I still doubt that all the draft errors were there previously as the bodies (and sketches they originated from) have changed drastically. 
I've been using Fusion since 2016 also and have never experienced anything like this. 

I have tried to go back through my timeline and fix the errors, however the bodies / sketches are completely different to what I created originally, so the faces that have draft errors don't even exist anymore.

Here is the sequence of events that happened/caused my errors in the first place.

The file was fine and working 

- Changed a heap of appearances for an animation (face applied appearences)

- Realised that I preferred the appearance of a previously saved version 

- Tried to open the roll backfile of the previous version (this file was then 'corrupted') 
- Ever since then that file has not been able to be opened in its original state. 

I'm starting to think this is more of an issue with the sketch function rather than bodies as all the sketches that the bodies were extruded from are all super different from what I drew (they are both different shapes, and missing all the grid holes that I sketched). I've been going through the errors and most of the errors are relating to missing faces from bodies that were extruded from those sketches that are now very different. Ie the faces just don't exist any more as the sketch file has changed from a triangle to a rectangle.  

I've attached a couple of photos too, 
A screenshot from a while back before the file 'corrupted' 
One post 'corruption' 
And the new error that appeared "Mesh body does not have a positive volume" which was 100% not there before the sequence of events that lead to the file changing. 

Older screenshot whilst file was working 

Screenshot of file post 'corruption' 

Screenshot of the sketch files.

Comparison of a pre and post corrupted sketch file OW-68

[TrippyLighting]

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@I_Megaman_i wrote:

1. yes, so? did he provide a solution or a guide? no

---

He suggested that you start fixing the errors in the timeline. I believe that is the only way to success at the moment.

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@I_Megaman_i wrote:

2. I don't believe you. any proof?

---

As an Autodesk Expert Elite I am customer just as you are. I don't work for Autodesk and have a number of other CAD and 3D modeling tools at my disposal, but 95+ % of my work is competed in Fusion 360.  I help users here "for fun". As such I have no reason to make up stuff. I am definitely not under any obligation to provide any proof and have no interest to do so. You may believe whatever you want. 

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@I_Megaman_i wrote:

3. And I explained why you are not helping.

---

I'd be happy to help identify the modeling mistakes you made in your models prior to the update. Fixing them is up to you. It's a great learning. I've made plenty of them in the beginning 😉

[HughesTooling]

@I_Megaman_i  Do you have a design small enough to share in this thread with problems? If you can export a version saved before the last couple of updates I still have a version of Fusion I have not updated and could test.

What @TrippyLighting  is pointing out is Compute All would show errors in the files before the last update. 99% of the time Compute All is not needed but there are some workflows that cause errors that don't show in the timeline but they are there. Then the problem is other features are built on the error so when Compute All is run you get to see the first error that then snowballs along the timeline. If you have several designs now with errors, I'd suggest you run Compute All at the end of everyday so you're not sitting on a time bomb. And yes these errors shouldn't happen and if you find a workflow that creates them I'm sure Autodesk would be happy to know and fix the problem.

Mark

[jeff_strater]

@patt.t.klein - I took a look at this design.  In the July version, these are the errors I get:

I have access to the June16 build, and when I open that design in that older build, I see the same set of errors.  I realize that all that proves is that the July update did not introduce the problems in that design, but it does prove that, I believe

[HughesTooling]

@jeff_strater  I suspect the version in this thread has been opened and saved with the latest version, We would need to see an earlier version, pre July update.

Mark

[jeff_strater]

also, @patt.t.klein , one option for this design might be to turn off history.  There are a lot of features here that seem like they are unlikely to ever be edited.  If that is the case, then you may be better off with this model as a Direct Model.  That is certainly an extreme solution, but might be a way to get rid of the errors.

[jeff_strater]

@HughesTooling - I don't think that is the case.  Fusion does not support "backward migration" of data.  That is, you cannot open a design saved in the July version in an earlier version.  That is not true with "hotfix" updates (no data format changes), but with the major updates, it is.