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IDProjectCategoryView StatusDate SubmittedLast Update
0030024Community[OCCT] OCCT:Data Exchangepublic2018-08-07 10:102018-11-27 18:19
Reportereryar 
Assigned Toeryar 
PrioritynormalSeverityminor 
StatusfeedbackResolutionopen 
PlatformWindowsOSVC++ 2013OS Version64 bit
Product Version[OCCT] 7.3.0 
Target Version[OCCT] 7.4.0*Fixed in Version 
Summary0030024: DataExchange - 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 

-  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


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