0001979: external geometry reference point forgotten in sketch constraints - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0001979	FreeCAD	Bug	public	2015-02-22 20:19	2016-10-15 20:58

Reporter	misty soul	Assigned To
Priority	normal	Severity	minor	Reproducibility	always
Status	closed	Resolution	fixed
Platform	AMD64	OS	Linux	OS Version	Debian Jessie
Product Version	0.14
Fixed in Version	0.16

Summary	0001979: external geometry reference point forgotten in sketch constraints
Description	Sometimes when using part design, a sketch using some external geometry reference loses this reference point when a sketch from a prefious step is updated. The sketch them becomes under constrained and the features are not updated correctly. It seems this occurs only if the reference does not depend just on the previous sketch, but rather on an earlier sketch.
Steps To Reproduce	- create a new empty document - select Part Design workbench - create new sketch in XY plane - create a rectangle - set up constraints: * two diagonal vertices symetrical about origin * X and Y lengthes equal * X length 100mm - the sketch is now fully constrained, close it - create a 5mm pad from it - select the square horizontal face on top - create a new sketch on this face - create a circle - set up constraints: * radius 10mm * center coincident with origin - close the fully constrained sketch - create a pocket "through all" to have a punched square plate - select the square horizontal face on top - create a new sketch on this face - create a rectangle - select the top left corner of the plate as an "external geometry" reference - set up constraints: * X and Y lengthes equal * X length 10mm * top left rectangle vertex 10mm to the right of external geometry corner * top left rectangle vertex 10mm below external geometry corner - the sketch is now fully constrained, close it - create a pocket "through all" from it We now have a square plate with two holes, a circular one at center and a square one close to a corner. The dependency graph is: Pocket001 -> Sketch002 -> Pocket -> Sketch001 -> Pad -> Sketch - in the model, select the first skecth (label "Sketch") and edit it. We have our initial 100mm square. Select the 100mm length constraint and edit it to change its value to 95mm. The square hole does not move! As the corner is now closer to the center, the external geometry reference point have changed and the constraints in Sketch002 should have moved the square hole. Editing Sketch002 shows why this did not happen: the sketch is now under-constrained with two degrees of freedoms. The only remaining constraints are the 2 horizontal constraints, the 2 vertical constraints, the length equality constraint and the 10mm length constraint. The external geometry reference has disappeared and the corresponding horizontal and vertical offsets have disappeared too.
Additional Information	If in the steps above we don't do the intermediate circular hole, the external geometry corner is not lost. It seems some to me some kind of transitivity not managed properly.
Tags	No tags attached.

FreeCAD Information

misty soul 2016-09-27 20:06 reporter ~0007338	The bug seem to have been fixed, at least in version 0.16 available in Debian Jessie as of September 2016. Thanks!

normandc 2016-10-15 20:58 manager ~0007377	I confirm the bug has been fixed in the version below, won't hunt down the related commit though. misty soul, next time you report a bug, please consider attaching a file, it was a little time consuming to create a new one from scratch. The steps to reproduce were well detailed though! Thanks. OS: Ubuntu 14.04.5 LTS Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.16.6703 (Git) Build type: None Branch: releases/FreeCAD-0-16 Hash: 2ce5c8d2e3020d05005ed71f710e09e9aa561f40 Python version: 2.7.6 Qt version: 4.8.6 Coin version: 4.0.0a OCC version: 6.8.0.oce-0.17

Date Modified	Username	Field	Change
2015-02-22 20:19	misty soul	New Issue
2016-09-27 20:06	misty soul	Note Added: 0007338
2016-10-15 20:58	normandc	Note Added: 0007377
2016-10-15 20:58	normandc	Status	new => closed
2016-10-15 20:58	normandc	Resolution	open => fixed
2016-10-15 20:58	normandc	Fixed in Version	=> 0.16