View Issue Details

IDProjectCategoryView StatusLast Update
0002325PartDesignBugpublic2022-01-24 19:16
Reporterjoostn Assigned Toabdullah  
Status assignedResolutionopen 
PlatformMacOS10.11OS Version10.11
Product Version0.15 
Target Version0.20 
Summary0002325: Pad -> Fillet -> Apply Thickness causes crash (upstream OCC bug)
DescriptionSee attached project and steps below:
Steps To Reproduce- Open test3.FCStd
- Switch to Part workbench
- highlight a face of the 'Fillet' solid (I tried the topmost flat face as displayed)
- select the Apply Thickness tool

Bang! crash.
Additional InformationOS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.15.4671 (Git)
Branch: releases/FreeCAD-0-15
Hash: 244b3aef360841646cbfe80a1b225c8b39c8380c
Python version: 2.7.9
Qt version: 4.8.6
Coin version: 4.0.0a

I've also tried with a daily build:

OS: Mac OS X
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.5846 (Git)
Build type: Unknown
Branch: master
Hash: 71be79e09e293bd2ccb1470981f07807be4c04fb
Python version: 2.7.10
Qt version: 4.8.7
Coin version: 3.1.3
OCC version: 6.7.0
Tags#ready-for-migration, OCC 7.2.1, OCC Bug, OCC NotOnRoadmap, upstream
FreeCAD Information



2015-11-01 21:56


test3.FCStd (Attachment missing)


2016-02-28 20:47

administrator   ~0006859

TKG3dd.dll!Geom_TrimmedCurve::Geom_TrimmedCurve(const Handle_Geom_Curve & C={...}, const double U1=0.00000000000000000, const double U2=1.5707963267949001, const bool Sense=true) Line 80 + 0x1d bytes C++
TKOffsetd.dll!BRepOffset_Tool::TryProject(const TopoDS_Face & F1={...}, const TopoDS_Face & F2={...}, const TopTools_ListOfShape & Edges={...}, TopTools_ListOfShape & LInt1={...}, TopTools_ListOfShape & LInt2={...}, const TopAbs_State Side=TopAbs_IN, const double TolConf=4.9999999999999998e-007) Line 1983 + 0x49 bytes C++
TKOffsetd.dll!BRepOffset_Inter3d::ContextIntByArc(const TopTools_IndexedMapOfShape & ContextFaces={...}, const bool InSide=false, const BRepOffset_Analyse & Analyse={...}, const BRepAlgo_Image & InitOffsetFace={...}, BRepAlgo_Image & InitOffsetEdge={...}) Line 864 C++
TKOffsetd.dll!BRepOffset_MakeOffset::Intersection3D(BRepOffset_Inter3d & Inter={...}) Line 2591 C++
TKOffsetd.dll!BRepOffset_MakeOffset::MakeOffsetShape() Line 727 C++
TKOffsetd.dll!BRepOffset_MakeOffset::MakeThickSolid() Line 792 C++
TKOffsetd.dll!BRepOffsetAPI_MakeThickSolid::Build() Line 72 C++
TKOffsetd.dll!BRepOffsetAPI_MakeThickSolid::BRepOffsetAPI_MakeThickSolid(const TopoDS_Shape & S={...}, const TopTools_ListOfShape & ClosingFaces={...}, const double Offset=1.0000000000000000, const double Tol=9.9999999999999995e-008, const BRepOffset_Mode Mode=BRepOffset_Skin, const bool Intersection=false, const bool SelfInter=false, const GeomAbs_JoinType Join=GeomAbs_Arc) Line 60 + 0xd bytes C++
Part_d.pyd!Part::TopoShape::makeThickSolid(const TopTools_ListOfShape & remFace={...}, double offset=1.0000000000000000, double tol=9.9999999999999995e-008, bool intersection=false, bool selfInter=false, short offsetMode=0, short join=0) Line 2099 + 0xa2 bytes C++
Part_d.pyd!Part::Thickness::execute() Line 605 + 0x64 bytes C++

That's a bug in the OCC library.


2016-03-01 15:11

manager   ~0006870

Still crashes here with the OCE from tanderson, OCE patches over OCC 6.9.1

OS: Ubuntu 12.04.5 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6523 (Git)
Build type: Release
Branch: master
Hash: ecd6517cb00fcf05edd41a38b3ce1fa8b16ec3ad
Python version: 2.7.3
Qt version: 4.8.2
Coin version: 3.1.3
OCC version: 6.9.1.oce-0.18-dev


2016-03-14 19:52

administrator   ~0006907

Might be related:


2017-05-12 12:32

administrator   ~0008973

@joostn do you mind re-uploading the attachment? It didn't survive are previous tracker backup restore.


2017-05-12 13:21

reporter   ~0008974

I hope this is the file (it has the same name).
test3-2.FCStd (9,368 bytes)


2017-08-21 11:07

administrator   ~0009976

@normandc do you mind weighing in ?


2017-09-02 11:27

administrator   ~0010060

With occ7.2 it still crashes and shows the identical stack trace.


2018-09-13 20:09

administrator   ~0011731

@chrisb would you please test to see if issue is still present. Thanks!


2019-04-24 11:53

administrator   ~0013045

Adding to 0.19 roadmap so that bug gets attention


2020-06-07 14:55

manager   ~0014509

I have reported the bug upstream and provided a possible patch to avoid the segfault:

For your administration ;)


2020-08-14 17:00

reporter   ~0014704

Can we hope this 4 years bug to be solve in a near future ?
I can see proposed patch but always testing newer version never solve the problem...
This bug really kills Freecad experience and adoption because it prevents the realization of even simple shells that are the most common operation for boxes and enclose cases...
So we have no workaround than using another 3D CAD... Really too bad !


2020-08-21 20:52

administrator   ~0014706

Added to


2020-11-17 10:34

reporter   ~0014996

I am coming back on this issue with the following example showing a weird behavior that can lead to better understand the bug.
In the following example, removing the face without fillet and trying to create a thickness of 1mm inward leads to the famous bug...
But if first of all I create a thickness of 0mm inward I obtain a new solid that then enables to create a thickness of 1mm inward without leading to the bug.
So the bug could be on freecad side ?
bug_thickness.FCStd (22,731 bytes)


2020-11-18 13:22

reporter   ~0014997

Last edited: 2020-11-18 13:36

When I do the same steps (thickness of 0 mm inward), the body is also rotating 90 degrees on the x axis
As I understand it, problems arise when there are chamfer (or fillets) in the part. When a wall is created inward, the chamfer also scales, and at some point it seems to invert and create self-intersections. I more or less learned how to bypass this problem by adding fillets to the chamfers or chamfers to the fillets, but this is not the solution to the problem, because it takes a long time to guess the right values.
OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.22960 (Git)
Build type: Release
Branch: master
Hash: c5a4b01d2e4218bcc0eb6650337650a6c65ef0e4
Python version: 3.8.6
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: Ukrainian/Ukraine (uk_UA)


2020-11-18 13:40

reporter   ~0014999

Here, I managed to make desired (2,4 mm) inward thickness and chamfers, but I have to add Fillet001 to apply Thickness
USB Charger Housing.FCStd (175,570 bytes)


2022-03-03 13:55

administrator   ~0016469

This ticket has been migrated to GitHub as issue 5634.

Issue History

Date Modified Username Field Change
2015-11-01 21:56 joostn New Issue
2015-11-01 21:56 joostn File Added: test3.FCStd
2016-02-28 20:47 wmayer Note Added: 0006859
2016-02-28 20:47 wmayer Status new => confirmed
2016-03-01 15:11 jmaustpc Note Added: 0006870
2016-03-14 19:52 wmayer Note Added: 0006907
2017-01-27 01:09 Kunda1 Tag Attached: OCC Bug
2017-01-27 01:09 Kunda1 Tag Attached: upstream
2017-05-12 12:32 Kunda1 Note Added: 0008973
2017-05-12 13:21 joostn File Added: test3-2.FCStd
2017-05-12 13:21 joostn Note Added: 0008974
2017-08-21 11:07 Kunda1 Note Added: 0009976
2017-09-02 11:27 wmayer Note Added: 0010060
2017-10-10 02:10 Kunda1 Tag Attached: OCC 7.2.1
2017-10-10 02:11 Kunda1 Summary Pad -> Fillet -> Apply Thickness causes crash => Pad -> Fillet -> Apply Thickness causes crash (upstream OCC bug)
2017-10-10 02:12 Kunda1 Tag Attached: OCC NotOnRoadmap
2017-10-18 11:20 wmayer Project FreeCAD => PartDesign
2018-09-13 20:09 Kunda1 Note Added: 0011731
2019-04-24 11:53 Kunda1 Target Version => 0.19
2019-04-24 11:53 Kunda1 Note Added: 0013045
2020-06-07 14:55 abdullah Note Added: 0014509
2020-06-13 15:32 abdullah Assigned To => abdullah
2020-06-13 15:32 abdullah Status confirmed => assigned
2020-08-14 17:00 sfornengo Note Added: 0014704
2020-08-21 20:52 Kunda1 Note Added: 0014706
2020-11-17 10:34 sfornengo Note Added: 0014996
2020-11-17 10:34 sfornengo File Added: bug_thickness.FCStd
2020-11-18 13:22 andergrin Note Added: 0014997
2020-11-18 13:36 andergrin Note Edited: 0014997
2020-11-18 13:40 andergrin Note Added: 0014999
2020-11-18 13:40 andergrin File Added: USB Charger Housing.FCStd
2021-02-06 06:43 abdullah Target Version => 0.20
2022-01-24 19:16 Kunda1 Tag Attached: #ready-for-migration