View Issue Details

IDProjectCategoryView StatusLast Update
0004610FreeCADBugpublic2021-04-13 20:37
Reportergreyltc Assigned To 
PriorityhighSeveritymajorReproducibilityalways
Status newResolutionopen 
PlatformLinuxOSLinuxOS Version5.11.10
Product Version0.19 
Summary0004610: OCC's step export pathway generates bad geometry [update: on upstream's OCC 7.6 Roadmap]
DescriptionOCC(version 7.5.0 or later)'s step export pathway generates bad geometry. I think this might be a recent regression because I think this issue isn't present in version 7.4.0.
Steps To Reproduce1. Make sure your build uses opencascade 7.5.0 or later.
2. File --> Import the attached .brep file.
3. File --> Export the shape you just imported as "STEP with colors (*.step *.stp)".
4. Reimport the .step file you just exported and behold its screwed up geometry.
5. (Optional) Verify the step file's messed up nature with some other step file viewer if you like.
Additional InformationGood geometry (.brep, attached):


Bad geometry (.step, after export):
Tags#pending-forum, OCC 7.5, OCC 7.6, OCC Bug, upstream
FreeCAD InformationOS: Arch Linux (GNOME/gnome)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24349 (Git)
Build type: Release
Branch: master
Hash: f6863bdb7714c71962bfb5c84f3070e06f436854
Python version: 3.9.2
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)

Activities

greyltc

2021-03-29 14:03

reporter  

good_geometry.brep (24,283 bytes)   
DBRep_DrawableShape

CASCADE Topology V1, (c) Matra-Datavision
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good_geometry.brep (24,283 bytes)   

Kunda1

2021-03-29 17:12

administrator   ~0015577

forum thread: https://forum.freecadweb.org/viewtopic.php?f=8&t=57226

Kunda1

2021-03-29 19:35

administrator   ~0015582

Bugs also filed upstream and downstream

Thank you for starting a thread for this.
I don't exactly know whos code this is a bug in, but I suspect it's in opencascade's.
I've filed a report there too: https://tracker.dev.opencascade.org/view.php?id=32264

I've seen a similar issue with other software (cadquery) that uses occt's step export feature and filed a bug there too!
https://github.com/CadQuery/cadquery/issues/697

greyltc

Kunda1

2021-03-29 19:45

administrator   ~0015583

Upstream OCC has assigned this issues to OCC 7.6 roadmap. Thanks @greyltc for outstanding bug reporting!

greyltc

2021-03-31 13:08

reporter   ~0015588

Last edited: 2021-03-31 18:54

View 2 revisions

The opencascade devs have worked quickly to solve the issue. They came up with the attached patch to fix the problem. I've tested that it applies cleanly over the latest occt release, 7.5.1. As written above, it seems scheduled for inclusion in the 7.6.0 release.

Edit: Actually looks like they're going to roll this fix into a 7.5.2 release.
corrupted_step_fix.patch (2,040 bytes)   
From 7f536e166c716605eb625f283779da5f72b0d24f Mon Sep 17 00:00:00 2001
From: gka <galina.kulikova@opencascade.com>
Date: Wed, 31 Mar 2021 11:43:16 +0300
Subject: [PATCH] 0032264: Data Exchange - STEP exporter generates bad geometry
 [REGRESSION since 7.4.0]

Location of edge is applied to geom curve before analysis of vertices projections
---
 src/TopoDSToStep/TopoDSToStep_MakeStepEdge.cxx | 7 ++++---
 tests/bugs/step/bug32264                       | 8 ++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)
 create mode 100644 tests/bugs/step/bug32264

diff --git a/src/TopoDSToStep/TopoDSToStep_MakeStepEdge.cxx b/src/TopoDSToStep/TopoDSToStep_MakeStepEdge.cxx
index 922c95313c..e6d4c0cd90 100644
--- a/src/TopoDSToStep/TopoDSToStep_MakeStepEdge.cxx
+++ b/src/TopoDSToStep/TopoDSToStep_MakeStepEdge.cxx
@@ -186,9 +186,11 @@ void TopoDSToStep_MakeStepEdge::Init(const TopoDS_Edge& aEdge,
   
   Handle(StepGeom_Curve) Gpms;
   Handle(Geom_Curve) C = CA.Curve().Curve();
+ 
   if (!C.IsNull()) {
     C = Handle(Geom_Curve)::DownCast(C->Copy());
-
+    gp_Trsf Tr1 = CA.Trsf();
+    C->Transform(Tr1);
     // Special treatment is needed for very short edges based on periodic curves.
     // Since edge in STEP does not store its parametric range, parameters are computed
     // on import by projecting vertices on a curve, and for periodic curve this may 
@@ -246,8 +248,7 @@ void TopoDSToStep_MakeStepEdge::Init(const TopoDS_Edge& aEdge,
       }
     }
 
-    gp_Trsf Tr1 = CA.Trsf();
-    C->Transform(Tr1);
+ 
     GeomToStep_MakeCurve MkCurve(C);
     Gpms = MkCurve.Value();
   }
diff --git a/tests/bugs/step/bug32264 b/tests/bugs/step/bug32264
new file mode 100644
index 0000000000..94c122ee9c
--- /dev/null
+++ b/tests/bugs/step/bug32264
@@ -0,0 +1,8 @@
+restore [locate_data_file bug32264.brep] s
+set aTmpFile "$imagedir/${casename}.brep"
+testwritestep "$aTmpFile" s
+testreadstep  "$aTmpFile" s1
+file delete   "$aTmpFile"
+checkshape s1 f
+checkmaxtol s1 -ref 1.e-7
+checkprops s1 -v 16.1759 -deps 0.01
-- 
2.20.1

corrupted_step_fix.patch (2,040 bytes)   

vern.zimm

2021-04-13 20:37

reporter   ~0015612

Is it possible to put the patch into weekly build in the meantime before it is released with OCC? I'm kind of stuck at the moment. Have to export to BREP and then use 0.18.4 to export to STEP...

Issue History

Date Modified Username Field Change
2021-03-29 14:03 greyltc New Issue
2021-03-29 14:03 greyltc Tag Attached: OCC 7.5
2021-03-29 14:03 greyltc Tag Attached: OCC Bug
2021-03-29 14:03 greyltc File Added: good_geometry.brep
2021-03-29 17:12 Kunda1 Note Added: 0015577
2021-03-29 17:12 Kunda1 Tag Attached: #pending-forum
2021-03-29 19:35 Kunda1 Note Added: 0015582
2021-03-29 19:36 Kunda1 Tag Attached: upstream
2021-03-29 19:36 Kunda1 Tag Attached: OCC 7.6
2021-03-29 19:45 Kunda1 Note Added: 0015583
2021-03-29 19:50 Kunda1 Summary OCC's step export pathway generates bad geometry => OCC's step export pathway generates bad geometry [update: on upstream's OCC 7.6 Roadmap]
2021-03-29 19:50 Kunda1 Steps to Reproduce Updated View Revisions
2021-03-29 19:50 Kunda1 Additional Information Updated View Revisions
2021-03-29 19:50 Kunda1 FreeCAD Information OS: Arch Linux (GNOME/gnome) Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.19.24349 (Git) Build type: Release Branch: master Hash: f6863bdb7714c71962bfb5c84f3070e06f436854 Python version: 3.9.2 Qt version: 5.15.2 Coin version: 4.0.1 O... => OS: Arch Linux (GNOME/gnome) Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.19.24349 (Git) Build type: Release Branch: master Hash: f6863bdb7714c71962bfb5c84f3070e06f436854 Python version: 3.9.2 Qt version: 5.15.2 Coin version...
2021-03-31 13:08 greyltc Note Added: 0015588
2021-03-31 13:08 greyltc File Added: corrupted_step_fix.patch
2021-03-31 18:54 greyltc Note Edited: 0015588 View Revisions
2021-04-13 20:37 vern.zimm Note Added: 0015612