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IDProjectCategoryView StatusDate SubmittedLast Update
0027251Community[OCCT] OCCT:Data Exchangepublic2016-03-11 13:552019-07-10 22:00
ReporterMarkus 
Assigned Togka 
PrioritynormalSeverityminor 
StatusnewResolutionopen 
PlatformOSOS Version
Product Version[OCCT] 7.0.0 
Target Version[OCCT] 7.5.0*Fixed in Version 
Summary0027251: Shape becomes invalid when exported to STEP and imported back
DescriptionShape before export to STEP is valid, but after import becomes invalid.
Steps To Reproducerestore cc.brep c

whatis c

checkshape c

stepwrite 0 c c.stp

stepread c.stp r *

whatis r_1

checkshape r_1

TagsNo tags attached.
Test case numberbugs step bug27251
Attached Files? file icon cc.brep (479,000 bytes) 2016-03-11 13:55

- Relationships

-  Notes
(0069728)
mkv (tester)
2017-08-21 18:17

Problem described in issue is reproduced on current state of OCCT.
(0083380)
Matthias (developer)
2019-04-03 12:09

Original shape is non-manifold (corners touch each other).
In case the original shape is splitted into two faces, the issue doesn't occur.

When importing the STEP-file, are there any repairing mechanisms trying to repair some intersections and can't handle self-intersections due to non-manifold geometry?

The issue occurs also with IGES and with Parasolid (via CADExchanger).

- Issue History
Date Modified Username Field Change
2016-03-11 13:55 Timo New Issue
2016-03-11 13:55 Timo Assigned To => gka
2016-03-11 13:55 Timo File Added: cc.brep
2016-10-26 11:07 gka Target Version 7.1.0 => 7.2.0
2017-05-31 15:40 Timo Reporter Timo => Markus
2017-07-27 11:15 abv Target Version 7.2.0 => 7.4.0
2017-08-21 18:17 mkv Test case number => bugs step bug27251
2017-08-21 18:17 mkv Note Added: 0069728
2019-04-03 12:09 Matthias Note Added: 0083380
2019-07-10 22:00 abv Target Version 7.4.0 => 7.5.0*


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