0030024: DataExchange - STEP, IGES export support of BRep shapes based on tessellated geometry - MantisBT

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ID

Project

Category

View Status

Date Submitted

Last Update

0030024

Community

[OCCT] OCCT:Data Exchange

public

2018-08-07 10:10

2019-10-17 11:04

Reporter

eryar

Assigned To

gka

Priority

normal

Severity

feature

Status

feedback

Resolution

open

Platform

Windows

OS

VC++ 2013

OS Version

64 bit

Product Version

[OCCT] 7.3.0

Target Version

[OCCT] 7.5.0*

Fixed in Version

Summary

0030024: DataExchange - STEP, IGES export support of BRep shapes based on tessellated geometry

Description

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.

Tags

No tags attached.

Test case number

rec_prac_3dtess_geo_v1.pdf (989,463 bytes) 2018-11-26 05:45

Relationships

related to	0028125	new	msv	Open CASCADE	Modeling Algorithms - support of BRep shapes based on tessellated geometry
related to	0030839	new	gka	Open CASCADE	Data Exchange - triangulation-only STEP file is read as empty shape

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

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