Major section analysis bug

[blukaniec]

Section analysis is no longer working properly. After a major update (earlier this month?) an existing section analysis was always inverted (flipped) whenever it is shown. In order to correct this, I had to double click the analysis in the tree to bring up the edit window and it automatically corrects itself. 

Today, I updated to the latest (2/21) Fusion and now the issue is even worse - not only is the analysis inverted but it is significantly shifted as if the distance was edited to 6 inches or so. As before, double clicking to edit the analysis automatically corrects the issue. This is also happening on new analyses. It also happens if I create a new analysis, hide it, and make it visible again.

For clarification, whenever I go into a file, whether I just opened it or it is already opened, the section analysis is inverted and shifted. It happens if the analysis is visible when the file is opened or is hidden and then made visible. It happens if I create a new analysis, change tabs, and go back. As stated above, it happens if I simply hide an analysis and instantly make it visible again. In other words, it is always inverted and shifted, no matter the approach, when it is made visible. 

As I was writing this, I realized this is not happening 100% of the time - all test analysis created looking in the positive Z direction are having the issues but none looking in the negative Z. All analyses looking in the positive X direction have issues but not ones looking in the negative X. All analyses in the Y direction are shifting but not inverting.

Attached are screenshots with self explanatory file names. For reference, this analysis is looking positive Z direction.

This has become incredibly frustrating as I am switching files (tabs) back and forth working on parts and every time I have to fix the analyses.

[johnsonshiue]

Hi! Is this an imported assembly (Direct Modeling)? If yes, it could be related to the following thread.

https://forums.autodesk.com/t5/fusion-360-support/cycling-through-tabs-changes-angle-of-section-view...

Please share the f3d file here. I would like to understand the behavior better.

Many thanks!

[blukaniec]

Hi Johnson,

This is not an imported assembly. Every part in this assembly is designed by me in Fusion. This is happening on almost all of my assemblies.

Most of the time, the analyses are inverted and shifted/offset. Sometimes they are just inverted, and sometimes they are just shifted/offset. I have now run into a couple of analyses that are perpendicular to the original cut plane - just like in the thread you posted. As a bonus, while creating the test file below, the analysis is at a 45ish degree angle from the original.

phil_biggs also posted about this issue which has some updates from us:
https://forums.autodesk.com/t5/fusion-360-support/section-analysis-cut-plane-changes-orientation/td-...

This is a private design so I cannot share it on here. However, attached is a test assembly I made that replicates the issue. The first couple analyses I made worked properly but as soon as I added an analysis that cut multiple components the issue happened. See section5 - it is shifted and at a 45 degree angle or so. Either way, it is bugging up so you can try it out. Make section5 visible, hide it, and make it visible again.
https://a360.co/3Zs4stk

Thanks,
Brendan

Edit - I added some screenshots to show what happens after I hide section5 and make it visible again

[Phil.E]

Thanks for reporting this. It is logged as a bug with this ticket: FUS-122361

[samuel.templeUCPAE · Accepted solution]

Hello @blukaniec 

Thank you very much for bringing this to our attention. We have a fix for this and i have tested it in our test environments and can no longer reproduce the issue. Hopefully this will no longer be a problem in the march release.
Please do let us know if this causes you any more problems in the future.

FUS-122361 
FUS-122864

[blukaniec]

Thank you!

[blukaniec]

Thank you! I am looking forward the March release!

[moriarty.chch]

@samuel.templeUCPAE 

this behavior is still present in Fusion 2.0.18460 x86_64 - offset sections, wrong offsets ...

was a fix implemented?

havent used fusion in over a year - it generally seems to have got worse - slower and more bugs

[samuel.templeUCPAE]

I am sorry to hear this @moriarty.chch 
Would you be able to give more details and possibly test model, so that we can investigate this further?
A screen recording would also be incredibly helpful.

Thank you 

[blukaniec]

The fix was implemented long ago and I have not had any issues. I too found there to be a lot of bugs around this time but it all has been corrected and running smoothly.