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Published 20 hours ago • verified publisher icon FreeCAD

STEP Export does not contain all the geometry

Open bozzzzo opened this issue 7 months ago • 5 comments

Is there an existing issue for this?

  • [x] I have searched the existing issues

Problem description

Exporting the Gear16 that loooks OK in Freecad and passes geometry check in Part workbench produces a STEP file that is not a solid, because all the bottoms of the lettering is not closed in the STEP file and it also fails the geometry check, output in the bottom box. Apologies for not cleaning up the model to absolute bare minimum. The model uses additional workbenches, so could not test in safe mode. The lettering is done in two ways to test if sketch on surface is the culprit. If I cheange the font to a normal font the result is similar except the model falls apart since the R and the 6 produce an isolated thing.

Tried to export in both 1.0.0 and weekly, difference is just that weekly in addition produces the transparent issue.

Importing both STEP files to either 1.0.0 or weekly produces the same result in both builds, even FreeCad import does not match the object exported. Step file looks the same also in https://github.com/usnistgov/SFA and orca slicer refuses to load it.

Archive.zip

Full version info

OS: macOS 14.4.1
Architecture: arm64
Version: 1.0.0.39109 (Git) Conda
Build type: Release
Branch: (HEAD detached at 1.0.0)
Hash: 2fcc5317fe3aee96ca73475986a577719fc78e20
Python 3.11.10, Qt 5.15.15, Coin 4.0.3, Vtk 9.3.0, OCC 7.8.1
Locale: C/Default (C) [ OS: C/Default (C) ]
Stylesheet/Theme/QtStyle: FreeCAD Dark.qss/FreeCAD Dark/Fusion
Installed mods: 
  * ThreadProfile 1.92.0
  * ProDarkThemePreferencePack 1.0.0
  * fcgear 1.0.0
  * Pyramids-and-Polyhedrons
  * fasteners 0.5.31
  * lattice2 1.0.0
  * ExtremeProDark 2.9.0
  * Curves 0.6.51


----------

OS: macOS Sonoma (14.4)
Architecture: arm64
Version: 1.1.0dev.40971 (Git) Conda
Build date: 2025/03/24 18:02:34
Build type: Release
Branch: main
Hash: b33c2363226a5fc1e8222a02659118c95e1a5119
Python 3.11.11, Qt 6.7.3, Coin 4.0.3, Vtk 9.3.1, IfcOpenShell 0.8.1, OCC 7.8.1
Locale: C/Default (C) [ OS: English/Slovenia (en_SI) ]
Stylesheet/Theme/QtStyle: FreeCAD Dark.qss/FreeCAD Dark/
Logical DPI/Physical DPI/Pixel Ratio: 72/127.5/2
Installed mods: 
  * ThreadProfile 1.92.0
  * ProDarkThemePreferencePack 1.0.0
  * fcgear 1.0.0
  * Pyramids-and-Polyhedrons
  * fasteners 0.5.31
  * lattice2 1.0.0
  * ExtremeProDark 2.9.0
  * Curves 0.6.51

Subproject(s) affected?

None

Anything else?

Original object:

Checked object: Clone003 (Gear16)
Shape type:  Compound
Vertices:  793
Edges:  1201
Wires:  494
Faces:  451
Shells:  1
Solids:  1
CompSolids:  0
Compounds:  1
Shapes:  2942
----------
Area:  2150.94
Volume:  2800.42
Length:  4039.09
Orientation:  Forward
Global placement = Placement
Tolerance information: 
 Global Minimum: 1e-07
 Global Average: 3.1754956440603516e-05
 Global Maximum: 0.005676687551545

Imported STEP file:

Unnamed.Part__Feature (Gear16) | Shell | Invalid
  Edge444 | Boolean operation: Invalid curve on surface
  Face155 | Boolean operation: Invalid curve on surface

Checked object: Part__Feature (Gear16)
Shape type:  Shell
Vertices:  793
Edges:  1201
Wires:  452
Faces:  409
Shells:  1
Solids:  0
CompSolids:  0
Compounds:  0
Shapes:  2856
----------
Area:  2127.94
Volume:  2748.53
Mass:  2127.94
Length:  3882.28
Center of mass:  [0.02, 0.01, 7.82]
Orientation:  Forward
SymmetryAxis:  False
SymmetryPoint:  False
Moments:  [113508.84, 112113.86, 107315.69]
FirstAxisOfInertia:  [-0.11, 0.99, -0.03]
SecondAxisOfInertia:  [0.99, 0.11, 0.05]
ThirdAxisOfInertia:  [-0.05, 0.02, 1.0]
RadiusOfGyration:  [7.3, 7.26, 7.1]
Global placement = Placement
Tolerance information: 
 Global Minimum: 1e-07
 Global Average: 2.2618122396838584e-05
 Global Maximum: 0.002901250750407379

Code of Conduct

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bozzzzo avatar Apr 02 '25 09:04 bozzzzo

@pieterhijma is this an OCC issue?

maxwxyz avatar Apr 06 '25 08:04 maxwxyz

In case this is of any help, here is a much simplified testcase that still reproduces for me.

reduced testcase.zip

bozzzzo avatar Apr 06 '25 16:04 bozzzzo

I have problems loading the (non-reduced) file. I had this error message:

<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.gears'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'pygears'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.Curves'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.Curves'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.Curves'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.Curves'
<string>(1)<class 'ModuleNotFoundError'>: No module named 'freecad.gears'

I installed Curves and freecad.gears but I notice that I can't find fcgear 1.0.0 as @bozzzzo has. This is my setup:

OS: Arch Linux (tty)
Architecture: x86_64
Version: 1.1.0dev.41588 (Git)
Build date: 2025/05/06 07:29:45
Build type: Unknown
Branch: main
Hash: c192a0e1669a6fe30d31164b01fb84ecb5460cf4
Python 3.13.3, Qt 6.9.0, Coin 4.0.3, Vtk 9.4.2, boost 1_88, Eigen3 3.4.0, PySide 
shiboken , SMESH 7.7.1.0, xerces-c 3.3.0, OCC 8.0.0.rc1-7aa85582ad
Locale: English/United States (en_US)
Stylesheet/Theme/QtStyle: OpenDark.qss/OpenDark/
Logical DPI/Physical DPI/Pixel Ratio: 96/92.6073/1.33333
Installed mods: 
  * OpenTheme 2024.5.16
  * Ondsel-Lens 2024.10.21.01
  * fasteners 0.5.34
  * WebTools 1.0.0
  * osh-autodoc-workbench 0.2.3
  * DynamicData 2.70.0
  * Curves 0.6.61
  * freecad.gears 1.3.0

@bozzzzo, could you explain the FCGear difference?

pieterhijma avatar May 06 '25 09:05 pieterhijma

The minimal version is indeed of help! I can reproduce. I'll add it to the OCCT Liaison todo list.

pieterhijma avatar May 06 '25 09:05 pieterhijma

@bozzzzo, could you explain the FCGear difference?

dunno, maybe something to do with https://github.com/FreeCAD/FreeCAD/tree/main/src/Mod/PartDesign/fcgear ?

I don't see PartDesign in your loaded workbenches...

nothing too fancy installed...

Image

bozzzzo avatar May 06 '25 11:05 bozzzzo

Hi! This issue hasn’t seen activity in a while. We automatically check each issue after 190 days without activity to keep the backlog tidy. If it’s still relevant, please update to the latest FreeCAD weekly build download here to see if the issue is already resolved.

If the issue is still relevant, let us know by adding a comment. Otherwise, we’ll close this issue automatically in 60 days.

Feel free to comment anytime to keep it open. Closed issues can always be reopened. Thanks for helping improve FreeCAD!

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github-actions[bot] avatar Nov 13 '25 00:11 github-actions[bot]

It shows some errors after recomputing:

<Exception> ObjectIdentifier.cpp(1456): Property 'beta' not found in 'beta'
in property binding 'step_testcase#InvoluteGear003.Placement'
10:12:07  InvoluteGear16: Property 'beta' not found in 'beta'
in property binding 'step_testcase#InvoluteGear003.Placement'

But indeed export makes it hollow and invalid.

OS: Windows 10 build 19045
Architecture: x86_64
Version: 1.1.0dev.20251111 (Git shallow)
Build date: 2025/11/11 16:45:10
Build type: Release
Branch: main
Hash: 4fbb389ce1295e04a5ad7f3a63f68b63b4f4036c
Python 3.11.14, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: Polish/Poland (pl_PL)
Navigation Style/Orbit Style/Rotation Mode: CAD/Rounded Arcball/Window center
Stylesheet/Theme/QtStyle: unset/FreeCAD Light/fusion
Logical DPI/Physical DPI/Pixel Ratio: 96/90.0633/1

FEA-eng avatar Nov 13 '25 09:11 FEA-eng