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IDProjectCategoryView StatusDate SubmittedLast Update
0030024Community[OCCT] OCCT:Data Exchangepublic2018-08-07 10:102021-01-11 22:39
Reportereryar 
Assigned Todpasukhi 
PrioritynormalSeverityfeature 
StatusassignedResolutionopen 
PlatformWindowsOSVC++ 2013OS Version64 bit
Product Version[OCCT] 7.3.0 
Target Version[OCCT] 7.6.0*Fixed in Version 
Summary0030024: Data Exchange - STEP, IGES export support of BRep shapes based on tessellated geometry
Descriptionocct7.3.0 now support tessellated geometry shape visualization, such as:
readstl s test.stl triangulation
vdisplay s

But when save the tessellated shape to STEP or IGES, such as:
stepwrite 0 s test.step

The saved STEP file have no geometry data.
TagsNo tags attached.
Test case number
Attached Filespdf file icon rec_prac_3dtess_geo_v1.pdf (989,463 bytes) 2018-11-26 05:45

- Relationships
related to 0028125newmsv Open CASCADE Modeling Algorithms - support of BRep shapes based on tessellated geometry 
related to 0030839newdpasukhi Open CASCADE Data Exchange - triangulation-only STEP file is read as empty shape 
related to 0029241assigneddpasukhi Open CASCADE Data Exchange - Empty shape after reading STEP file. 
parent of 0032049newdpasukhi Community Data Exchange - STEP file import problems 
Not all the children of this issue are yet resolved or closed.

-  Notes
(0081251)
eryar (developer)
2018-11-26 05:46

 I upload the Recommended Practices for 3D Tessellated Geometry for STEP,
the document can be downloaded from here:
https://www.cax-if.org/documents/rec_prac_3dtess_geo_v1.pdf [^]
(0081260)
gka (developer)
2018-11-26 11:29

 Implementation of this functionality is not expected in the current version of the Open CASCADE. If you have an urgent need contact us via contact form:
https://www.opencascade.com/contact [^]
(0081273)
eryar (developer)
2018-11-27 18:19

 Hello gka,

I do not have an urgent need for this functionality.

For the BRep shapes based on tessellated geometry, there are now serveral modeling alogirhtms support them, and can be displayed by the visualization module.

For data exchange module, it supports the BREP, STL tessellated shapes. Implementation other file format to exchange tessellated shapes data I think it is important functionality.

Best Regards,

- Issue History
Date Modified Username Field Change
2018-08-07 10:10 eryar New Issue
2018-08-07 10:10 eryar Assigned To => gka
2018-08-07 10:11 eryar Relationship added related to 0028125
2018-11-26 05:45 eryar File Added: rec_prac_3dtess_geo_v1.pdf
2018-11-26 05:46 eryar Note Added: 0081251
2018-11-26 11:29 gka Note Added: 0081260
2018-11-26 11:30 gka Assigned To gka => eryar
2018-11-26 11:30 gka Status new => feedback
2018-11-27 18:19 eryar Note Added: 0081273
2018-12-25 05:12 eryar Assigned To eryar => gka
2019-07-10 21:23 abv Target Version 7.4.0 => 7.5.0
2019-10-17 11:04 kgv Relationship added related to 0030839
2019-10-17 11:04 kgv Severity minor => feature
2020-10-02 21:39 abv Target Version 7.5.0 => 7.6.0*
2020-10-02 21:52 gka Assigned To gka => dpasukhi
2020-10-02 21:52 gka Status feedback => assigned
2020-10-02 22:30 dpasukhi Relationship added related to 0029241
2020-10-12 17:42 kgv Summary DataExchange - STEP, IGES export support of BRep shapes based on tessellated geometry => Data Exchange - STEP, IGES export support of BRep shapes based on tessellated geometry
2021-01-11 22:39 dpasukhi Relationship added parent of 0032049

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