[bug] Expression does not recalculate

[kisolre]

Here is another one. In the attached file trying to change the size of Box1x1 by changing corresponding DD parameter (from 15mm to 20mm) results in something strange. The Position.Z expression does not result in valid value but keeps the latest one from opening the file.
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ExpressionDoesNotRecalculate.gif (47.61 KiB) Viewed 821 times

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OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.28915 (Git)
Build type: Release
Branch: master
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[thomas-neemann]

...

If I delete this,

Bildschirmfoto_2022-05-20_20-29-33.png (3.66 KiB) Viewed 809 times

it works for me


OS: Ubuntu 20.04.1 LTS (XFCE/xubuntu)
Word size of FreeCAD: 64-bit
Version: 0.20.28909 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 2084652)
Hash: 20846523c9d8219ec0fe33c499a64e700d2266b6
Python 3.9.12, Qt 5.12.9, Coin 4.0.0, OCC 7.5.3
Locale: German/Germany (de_DE)

[kisolre]

If I delete this,

It should not matter since it is after the body position and moving the body to proper place should relocate everything to proper places and the fillet will work then.

[kisolre]

@realthunder, sorry to bother you, but since you mostly worked on expressions recently could you take a look into this?

[adrianinsaval]

Your "faulty" expression is at the body, bodies have a dependency on all it's children, if one if it's children fails to recompute the body will not be recomputed, I think this is expected behavior, perhaps not desirable though since the rest of the placement values can be manually updated

[openBrain]

It should not matter since it is after the body position and moving the body to proper place should relocate everything to proper places and the fillet will work then.

The fillet is faulty at file opening, even before trying to move the body.

[kisolre]

So then the Shape of the body should not depend in any way of the placement of the body? Here with the fillet there is a TNP (which is strange since the basic shape of the object should not change with the changed placement). And I cant think of a scenario to brake a body in compatible way.
I tried to change the height in 0.4mm increments (15mm->20mm) it worked.
If the placement was properly recalculated and all steps up to the fillet then the fillet could be fixed. But now there is no valid geometry from which to select. I made a temporary fix to allow the fillet to succeed, placement to properly recalculate and then again fix the fillet...
If this is unfixable in the current state perharps a mention in the docs (like I suspect there is one for the sketch flipping) should be made...

Now when I know what the problem is I can work around it if that happens again somewhere... But that is not the proper way IMHO.

[adrianinsaval]

how is the fillet affected by the placement?

[kisolre]

how is the fillet affected by the placement?

If the body is moved down only the top part of the front wall is cut (place for the lid). But if the body is not moved e slot is formed there instead and so the number of edges changes and so do their names.