Polar pattern of loft up to arc surface fails

[FreeCAD-Bug-Importer]

Issue imported from https://tracker.freecad.org/view.php?id=4788

• Reporter: garya
• Date submitted: 11/14/2021
• FreeCAD version: 0.2
• Category: Bug
• Status: new
• Tags: Loft, Part Design, PolarPattern

Original report text

If a loft is done from a square pillar resting on a ring, the resulting loft cannot be replicated in a polar array.

Forum thread: https://forum.freecadweb.org/viewtopic.php?f=3&t=63689

Several example files are posted in forum thread; the simplest is PolarPatrn_4.

Additional information

See the forum thread for other manifestations of this bug and attempts to work around.
It was suggested this is a problem with OpenCascade.

Steps to reproduce

Load PolarPatrn_4
Select Proto_WindingRib
Click PolarPattern
Result: Two posts are visible, 180 degrees apart
The original post has the additive loft; the patterned one does not (ok so far)
Click Add Feature
Result: The added post is removed (still ok)
Click on the AdditiveLoft
Result: AdditiveLoft is added to the PolarPattern parameters list in the dialog (correct)
The original additive loft disappears and no lofts are visible on either post (incorrect)

FreeCAD Info

OS: FreeBSD 11.4-RELEASE-p6 (XFCE/xfce)
Word size of FreeCAD: 64-bit
Version: 0.20.master (Built from source 2021-11-01)
Build type: Release
Python version: 3.7.9
Qt version: 5.15.2
Coin version: 4.0.0
OCC version: 7.5.0
Locale: C/Default (C)

Other bug information

• Priority: normal
• Severity: minor
• Category: Bug
• OS: FreeBSD 11.4-RELEASE
• Platform: PC
• Updated: 11/14/2021

[luzpaz]

bumped forum thread

[Fat-Zer]

Is this bug still actual?

I couldn't reproduce it on a recent git build with none of the provided examples. Simple recalculation of the model seams to produce a correct result in each of the provided files.

[chrisb-github]

Fixed in 0.21.31917

[luzpaz]

Thanks @PLChris. Next time do you mind linking directly to the commit so any devs viewing this in the future can quickly link to the fix? TIA

[chrisb-github]

Thanks @PLChris. Next time do you mind linking directly to the commit so any devs viewing this in the future can quickly link to the fix? TIA

I didn't check any commit, so I didn't know when or how it was fixed. I would guess though that it was fixed in OCC.