0003299: Sketcher should check redundant coincidences used with tangent constraints - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0003299	Sketcher	Feature	public	2018-01-03 18:32	2018-01-27 16:12

Reporter	chrisb	Assigned To	abdullah
Priority	normal	Severity	minor	Reproducibility	always
Status	closed	Resolution	fixed
Product Version	0.17
Target Version	0.18	Fixed in Version	0.17

Summary	0003299: Sketcher should check redundant coincidences used with tangent constraints
Description	There is a corresponding issue for the ValidateSketch tool: 0003298. The tangent constraint is often used together with a coincidence constraint instead of applying it to the endpoints instead. This often leads to problems in subsequent steps. So maybe something could be done about that in the Sketcher, but I don't know what, and how complicated it would be. Make the solver detect these conflicts and warn the user about it? Make the solver detect these conflicts and transparently replace the dual constraint with the proper point-on-point tangent constraint? NormandC I would prefer the first solution, doing something automatic might prohibit the possibility to have the erroneous situation as an intermediate step.
Steps To Reproduce	- Create two independent lines - apply tangent constraint on the lines (not the endpoints!) - apply coincidence to the endpoints Steps two and three can be interchanged
Additional Information	OS: Mac OS X Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.12915 (Git) Build type: Release Branch: (HEAD detached at 90a71f3) Hash: 90a71f34bc448d1396d2e27f4177885897199152 Python version: 2.7.14 Qt version: 5.6.2 Coin version: 4.0.0a OCC version: 7.1.0 Locale: German/Germany (de_DE)
Tags	No tags attached.

FreeCAD Information

chrisb 2018-01-03 18:32 developer	tangentWrongUsage.FCStd (3,529 bytes)

abdullah 2018-01-24 17:11 manager ~0010844	Note to self: - It is not feasible to modify the tangency constraints at solver level because once changed, they will be changed in at Sketcher level because they "travel" by pointer and are updated after solver execution. So it is not (clearly and cleanly) possible to decouple both. - The path must be at Sketcher level, not at solver (or sketch.cpp) level.

abdullah 2018-01-25 16:15 manager ~0010850	https://github.com/FreeCAD/FreeCAD/pull/1260

wmayer 2018-01-27 16:12 administrator ~0010877	https://github.com/FreeCAD/FreeCAD/commit/180d722a536b03432e003a021b5a239fa6785ec8 https://github.com/FreeCAD/FreeCAD/commit/620188073e27dfd0748981ca1685c5fec88c7eb3

Date Modified	Username	Field	Change
2018-01-03 18:32	chrisb	New Issue
2018-01-03 18:32	chrisb	Status	new => assigned
2018-01-03 18:32	chrisb	Assigned To	=> abdullah
2018-01-03 18:32	chrisb	File Added: tangentWrongUsage.FCStd
2018-01-03 20:34	Kunda1	Description Updated
2018-01-03 20:34	Kunda1	Relationship added	related to 0003298
2018-01-24 17:11	abdullah	Note Added: 0010844
2018-01-25 16:15	abdullah	Note Added: 0010850
2018-01-27 16:12	wmayer	Status	assigned => closed
2018-01-27 16:12	wmayer	Resolution	open => fixed
2018-01-27 16:12	wmayer	Fixed in Version	=> 0.17
2018-01-27 16:12	wmayer	Note Added: 0010877