[BUG] Coincidence with external geometry in Sketcher WB

[openBrain]

Hi,

I create a new topic to ease bug identifying.
At this thread a potential bug was found and confirmed ATM by bejant.

Bug description : in the "Constraints" group of the Tasks tab (left combo view) when selecting a coincidence (point on point) constraint set between a sketch drawing line endpoint and an external geometry line endpoint, then the 3D view shows highlighted (dark green by default) both the constrained point but also the center (origin) point This tends user to believe that point is constrained coincident with the center point while it isn't.
This wrong behavior seems to be not reproducible with other type of line than external geometry.
I attach a file that demonstrates the issue with a minimalist example (just select one of the constraints in the combo view with Sketch in edit mode).

Thans for further confirmation/investigation.

Bug currently confirmed with these FC infos :
---
OS: Ubuntu 18.04.1 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15780 (Git)
Build type: Release
Branch: master
Hash: f94e76c1116ec3b818961ff65131b3d86fa5b95e
Python version: 2.7.15rc1
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: French/France (fr_FR)
---
OS: Ubuntu 18.04.1 LTS
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.18.15780 (Git)
Build type: Release
Branch: master
Hash: f94e76c1116ec3b818961ff65131b3d86fa5b95e
Python version: 2.7.15rc1
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

[chrisb]

I added a comment in the linked post.

[openBrain]

I added a comment in the linked post.

The file I attached to the OP is a pure 0.18 file created from scratch and ... it has the same problem in my configuration.

[kisolre]

Does the same here. If a coincidence constraint connects to an external geometry vertex when it is selected in the Tasks pannel the sketch RootPoint also becomes greem as if it is selected. This does not happen when coincidence does not include external geometry vertex.

OS: Windows 8.1
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15694 (Git)
Build type: Release
Branch: master
Hash: 96dee91d5e7d7fd37f43a4dcf406a120ae1f1b8a
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Bulgarian/Bulgaria (bg_BG)

[chrisb]

The file I attached to the OP is a pure 0.18 file created from scratch and ... it has the same problem in my configuration.

Very good example, would you please create a bug report?

[openBrain]

Very good example, would you please create a bug report?

I'm still lacking an account there. May you or someone else with an account in the tracker do it ?
Do not hesitate to tell me if it's a pain for you, i'll create an account and do it by myself (even if I'll grumble about unavailable SSO )

[bejant]

After looking at this again, it might be specific to that single file, posted in this topic:
https://forum.freecadweb.org/viewtopic. ... 43#p285180

I tested again and don't get that behavior in the file I uploaded in my reply to that one, but I Constrained differently.

[chrisb]

issue #3831.

[chrisb]

Bejant, could you please retest with the reproduction recipe I gave in the ticket?

[kisolre]

chrisb, the description of the problem is somewhat misleading in the last step - selecting the connection point in 3D view works as expected. But selecting the coincidence constraint in Tasks panel highlights not only it but also the RootPoint of the sketch.