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0030024Community[OCCT] OCCT:Data Exchangepublic2018-08-07 10:102021-01-11 22:39
WindowsVC++ 201364 bit
[OCCT] 7.3.0 
[OCCT] 7.6.0* 
0030024: Data Exchange - STEP, IGES export support of BRep shapes based on tessellated geometry
occt7.3.0 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.
No tags attached.
related to 0028125new msv Open CASCADE Modeling Algorithms - support of BRep shapes based on tessellated geometry 
related to 0030839new dpasukhi Open CASCADE Data Exchange - triangulation-only STEP file is read as empty shape 
related to 0029241assigned dpasukhi Open CASCADE Data Exchange - Empty shape after reading STEP file. 
pdf rec_prac_3dtess_geo_v1.pdf (989,463) 2018-11-26 05:45
Issue History
2018-08-07 10:10eryarNew Issue
2018-08-07 10:10eryarAssigned To => gka
2018-08-07 10:11eryarRelationship addedrelated to 0028125
2018-11-26 05:45eryarFile Added: rec_prac_3dtess_geo_v1.pdf
2018-11-26 05:46eryarNote Added: 0081251
2018-11-26 11:29gkaNote Added: 0081260
2018-11-26 11:30gkaAssigned Togka => eryar
2018-11-26 11:30gkaStatusnew => feedback
2018-11-27 18:19eryarNote Added: 0081273
2018-12-25 05:12eryarAssigned Toeryar => gka
2019-07-10 21:23abvTarget Version7.4.0 => 7.5.0
2019-10-17 11:04kgvRelationship addedrelated to 0030839
2019-10-17 11:04kgvSeverityminor => feature
2020-10-02 21:39abvTarget Version7.5.0 => 7.6.0*
2020-10-02 21:52gkaAssigned Togka => dpasukhi
2020-10-02 21:52gkaStatusfeedback => assigned
2020-10-02 22:30dpasukhiRelationship addedrelated to 0029241
2020-10-12 17:42kgvSummaryDataExchange - 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 22:39dpasukhiRelationship addedparent of 0032049
2021-01-18 12:45dpasukhiRelationship deletedparent of 0032049

2018-11-26 05:46   
I upload the Recommended Practices for 3D Tessellated Geometry for STEP,
the document can be downloaded from here: [^]
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: [^]
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,