View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0004154||FreeCAD||Bug||public||2019-10-05 23:03||2020-10-08 01:12|
|Summary||0004154: Parametric constraint can be changed only one way for fully constrained sketch|
|Description||I've a sketchup drawing with named constraints. Increasing the constraint value works, decreasing it does not. (Increasing to a value and then trying to change back is broken too).|
I've encountered this bug in many forms, if the R is not a radius constraint but one of the length constraints (see file 2), it's not possible to change the value AT ALL.
|Steps To Reproduce||1. Open attached file|
2. Open sketcher with the "Sketch"
3. Change constraint R to 4mm
4. Change constraint R back to 3mm
Observe error: Negative datum values are not valid for the constraint with index 10 (That is the R constraint).
Expected: Change back obviously.
|Additional Information||OS: Windows 10|
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16131 (Git)
Build type: Release
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedKingdom (en_GB)
bug1.FCStd (12,451 bytes)
bug2.FCStd (12,465 bytes)
@axos88 thanks for reporting. According the guidelines (big yellow box on top of page), could you please first post to forum so your findings can be discussed ?
Notice that despite what you found can lead to interesting corner case tests, your sketch is very very lamous. It's highly suboptimal, and I could have bet just by seeing it that it can seriously hurt the solver. :)
EDIT : JFYI, you're cumulating 2 known corner cases.
1 - Setting equal radius and horizontal/vertical distance on an arc
2 - Having tangent arc/line obtained by construction but not by constraint
@openBrian, thanks for getting back to me. Sorry for not asking in the forum first, I understood it's for verifying and prefiltering wether reports are actually bugs, and it was pretty straightforward that this is.
I'll do that now, I'm curious why my sketch would be lamous and suboptimal and to learn how to do it better.
I'm not sure I understand the second corner case you mentioned, but I'm sure I'll get an answer there.
@axos88 actually the problem with direct reporting is that there is high chance that your "bug" is known & already reported. ;) Also it can be a known limitation.
Once you open a forum topic, may you please cross-reference it in this ticket ? Thx
||Once it gets approved, and I get a link to it, yes, of course.|
||@axos88 link to forum thread?|
|2019-10-05 23:03||axos88||New Issue|
|2019-10-05 23:03||axos88||File Added: bug1.FCStd|
|2019-10-05 23:03||axos88||File Added: bug2.FCStd|
|2019-10-07 10:46||openBrain||Note Added: 0013719|
|2019-10-07 10:47||openBrain||Status||new => feedback|
|2019-10-07 10:47||openBrain||Description Updated||View Revisions|
|2019-10-07 10:47||openBrain||Steps to Reproduce Updated||View Revisions|
|2019-10-07 10:47||openBrain||Additional Information Updated||View Revisions|
|2019-10-07 10:48||openBrain||Tag Attached: #post-to-forum|
|2019-10-07 10:52||openBrain||Note Edited: 0013719||View Revisions|
|2019-10-07 17:02||axos88||Note Added: 0013724|
|2019-10-07 17:02||axos88||Status||feedback => new|
|2019-10-07 17:09||openBrain||Note Added: 0013725|
|2019-10-07 17:13||axos88||Note Added: 0013726|
|2019-10-07 18:12||openBrain||Tag Detached: #post-to-forum|
|2019-10-07 18:12||openBrain||Tag Attached: #pending-forum|
|2020-10-08 01:12||Kunda1||Note Added: 0014790|