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IDProjectCategoryView StatusLast Update
0032127CommunityOCCT:Data Exchangepublic2024-07-09 20:12
Reporterrobertlipman Assigned Tosnn  
Status assignedResolutionopen 
Product Version7.5.0 
Summary0032127: Data Exchange - faceted STEP file will not open
DescriptionThe STEP file of the entire tractor that I downloaded from GrabCAD will not open in CAD Assistant and cannot be processed by our use of OCCT. The STEP file was generated by CAD Exchanger and can be opened by other STEP viewers. There are no syntax errors in the file.
Steps To ReproduceDownload vario1000.stp from and import to CAD Assistant.
TagsNo tags attached.
Test case number

Attached Files

  • cadass_vario1000_stp.png (106,735 bytes)


related to 0030839 closedbugmaster Open CASCADE Data Exchange - triangulation-only STEP file is read as empty shape 
related to 0028840 closedbugmaster Open CASCADE Data Exchange - rewrite the STL Reader/Writer 



2021-02-12 11:36


cadass_vario1000_stp.png (106,735 bytes)


2021-02-12 11:53

developer   ~0098842

Last edited: 2021-02-12 11:53

CAD Assistant has opened "vario1000.stp", although it took enormous 71 minutes for the model of such complexity.

The model itself is, apparently, was exported into STEP from some non-B-Rep format, as it consists of 134k of planar Faces.
Such kind of "fake B-Rep" definition traditionally causes some performance issues in OCCT - it would be nice considering some optimizations for such scenarios...

Issue History

Date Modified Username Field Change
2021-02-11 18:34 robertlipman New Issue
2021-02-11 18:34 robertlipman Assigned To => gka
2021-02-12 11:36 kgv File Added: cadass_vario1000_stp.png
2021-02-12 11:53 kgv Note Added: 0098842
2021-02-12 11:53 kgv Note Edited: 0098842
2021-02-12 11:54 kgv Summary STEP file will not open => Data Exchange - faceted STEP file will not open
2021-02-12 11:55 kgv Relationship added related to 0030839
2021-02-12 12:10 kgv Relationship added related to 0028840
2022-05-27 16:29 msv Assigned To gka => snn
2022-05-27 16:29 msv Status new => assigned