FreeCADView Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0004610 | FreeCAD | Bug | public | 2021-03-29 14:03 | 2021-04-23 11:03 |
| Reporter | greyltc | Assigned To | |||
| Priority | high | Severity | major | Reproducibility | always |
| Status | closed | Resolution | fixed | ||
| Platform | Linux | OS | Linux | OS Version | 5.11.10 |
| Product Version | 0.19 | ||||
| Fixed in Version | 0.19 | ||||
| Summary | 0004610: OCC's step export pathway generates bad geometry [update: on upstream's OCC 7.6 Roadmap] | ||||
| Description | OCC(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 Reproduce | 1. 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 Information | Good geometry (.brep, attached): Bad geometry (.step, after export):  | ||||
| Tags | OCC 7.5.2, OCC Bug, upstream | ||||
| 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 OCC version: 7.5.0 Locale: English/United States (en_US) | ||||
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good_geometry.brep (24,283 bytes)
DBRep_DrawableShape
CASCADE Topology V1, (c) Matra-Datavision
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Sh
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+1 0 |
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forum thread: https://forum.freecadweb.org/viewtopic.php?f=8&t=57226 |
|
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Bugs also filed upstream and downstream
|
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Upstream OCC has assigned this issues to OCC 7.6 roadmap. Thanks @greyltc for outstanding bug reporting! |
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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
|
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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... |
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This patch was included in to OCC 7.5.2 which was just released. Thank you so much for your efforts @greyltc! Closing ticket! |
| 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 | |
| 2021-03-29 19:50 | Kunda1 | Additional Information Updated | |
| 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 | |
| 2021-04-13 20:37 | vern.zimm | Note Added: 0015612 | |
| 2021-04-23 11:02 | Kunda1 | Status | new => closed |
| 2021-04-23 11:02 | Kunda1 | Resolution | open => fixed |
| 2021-04-23 11:02 | Kunda1 | Fixed in Version | => 0.19 |
| 2021-04-23 11:02 | Kunda1 | Note Added: 0015643 | |
| 2021-04-23 11:02 | Kunda1 | Tag Detached: #pending-forum | |
| 2021-04-23 11:02 | Kunda1 | Tag Detached: OCC 7.6 | |
| 2021-04-23 11:03 | Kunda1 | Tag Detached: OCC 7.5 | |
| 2021-04-23 11:03 | Kunda1 | Tag Attached: OCC 7.5.2 |
