0002699: Part Offset2D makes direction of Extrude unstable - FreeCAD Tracker

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ID	Project	Category	View Status	Date Submitted	Last Update

0002699	FreeCAD	Bug	public	2016-09-16 19:00	2016-09-19 18:35

Reporter	DeepSOIC	Assigned To	DeepSOIC
Priority	normal	Severity	major	Reproducibility	always
Status	closed	Resolution	fixed
Product Version	0.17
Target Version	0.17

Summary	0002699: Part Offset2D makes direction of Extrude unstable
Description	When Part Extrude along normal is applied to Part Offset2D, the direction of extrusion changes after saving/reloading a document, or copying the shape.
Steps To Reproduce	1. Sketch an ellipse. 2. Part 2D offset it (leave default values) 3. Part Extrude the offset. Leave defaults. Normal direction is +Z. 4. Draft clone the Offset2D. 5. Part Extrude the clone. Extrusion direction is -Z. OR 1. Sketch ellipse. 2. Part 2D offset. 3. Part Extrude the offset. -> Extrusion goes up (+Z) 4. Delete Extrude. 5. Save project, and reopen it. 6. Part Extrude the offset. -> Extrusion goes downwards (-Z). 7. Force recompute. -> Extrusion direction changes to upwards (+Z).
Additional Information	OS: Windows 10 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.17.8361 (Git) Build type: Release Branch: DeepSOIC10 Hash: 4ac7673e543274bcae856872033a114c7b60481b Python version: 2.7.8 Qt version: 4.8.7 Coin version: 4.0.0a OCC version: 7.0.0 `>>> App.ActiveDocument.Offset2D.Shape.Orientation 'Forward' >>> sh = App.ActiveDocument.Offset2D.Shape >>> Part.Face(sh).Surface.Axis Vector (0.0, 0.0, 1.0) >>> Part.Face(sh.copy()).Surface.Axis Vector (-0.0, -0.0, -1.0)` Seems like there is some volatile reversedness in OCC offset result, that goes away upon copying, or saving to brep then loading... forum thread: "Part Offset2D, Draft Clone and Extrude direction weirdness" http://forum.freecadweb.org/viewtopic.php?f=3&t=17449
Tags	No tags attached.

FreeCAD Information

FreeCAD: master 47c745f2 2016-09-18 17:45:04 DeepSOIC Details Diff	Part: Offset2D: fix save-load instability Fixes 0002699 It was found out that when direction of normal found by FindPlane depends on if we are using result of offset directly, or after copying. The fix (workaround) is to copy offset result inside offset routine, so that no unstable behavior makes its way to the user.		Affected Issues 0002699
	mod - src/Mod/Part/App/TopoShape.cpp		Diff File
FreeCAD: master c866df1d 2016-09-19 20:34:51 yorik Committer: GitHub Details Diff	Merge pull request 0000285 from DeepSOIC/PartOffset2D_fix1 Part: Offset2D: fix save-load instability (bug 0002699)		Affected Issues 0002699
	mod - src/Mod/Part/App/TopoShape.cpp		Diff File

Date Modified	Username	Field	Change
2016-09-16 19:00	DeepSOIC	New Issue
2016-09-16 19:00	DeepSOIC	Status	new => assigned
2016-09-16 19:00	DeepSOIC	Assigned To	=> DeepSOIC
2016-09-16 19:00	DeepSOIC	File Added: extrude-clone-offset-ellipse.FCStd
2016-09-16 19:07	DeepSOIC	Relationship added	related to 0002700
2016-09-19 18:35	DeepSOIC	Changeset attached	=> FreeCAD Master master 47c745f2
2016-09-19 18:35	yorik	Changeset attached	=> FreeCAD Master master c866df1d
2016-09-19 18:35	DeepSOIC	Status	assigned => closed
2016-09-19 18:35	DeepSOIC	Resolution	open => fixed