0029121: Iges-reader reads invalid shape

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Date Submitted

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0029121

Open CASCADE

[OCCT] OCCT:Data Exchange

public

2017-09-18 14:25

2020-09-15 12:03

Reporter

nbv

Assigned To

gka

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0029121: Iges-reader reads invalid shape

Description

Test de iges_1 R8

ffirst.bin attached file contains the face read before ShapeFix_Shape calling.
Result shape (after fixshape) is res_1.

Indeed, both shapes are invalid (at least, contain not-closed oriented - only FORWARD/REVERSED edges - wires).

Finally, BRepTools_WireExplorer works incorrectly with the read face. The face res_1_364 contains 14 edges. But BRepTools_WireExplorer finds 6 ones only.

Steps To Reproduce

binrestore ffirst.bin

test de iges_1 R8
explode res_1 f
don res_1_364
fit

vori res_1_364
# Maybe, some edges must be marked as INTERNAL or must not be read. However, we have only oriented edges.

nbshapes res_1_364
# EDGE : 14

explode res_1_364 w
# res_1_364_1 res_1_364_2

wexplo res_1_364_1 res_1_364
set n1 [llength [directory WEDGE_*]]

# Remove all variables "WEDGE_*"
foreach x [directory WEDGE_*] { unset $x }

wexplo res_1_364_2 res_1_364
set n2 [llength [directory WEDGE_*]]

puts [expr $n1+$n2]
# 6

Additional information
and documentation updates

IR-2017-09-07

Tags

No tags attached.

Test case number

Attached Files

ffirst.bin (6,941 bytes) 2017-09-18 14:26

Relationships

related to	0028674	assigned	nbv	BRepTools_WireExplorer works unstable and does not return several edges
child of	0029133	closed	bugmaster	Unstable test cases

Notes
(0070635) nbv (developer) 2017-09-18 14:28	This problem has been detected while fixing the issue #28211.

Issue History
Date Modified	Username	Field	Change
2017-09-18 14:25	nbv	New Issue
2017-09-18 14:25	nbv	Assigned To	=> gka
2017-09-18 14:26	nbv	File Added: ffirst.bin
2017-09-18 14:28	nbv	Note Added: 0070635
2017-09-18 14:28	nbv	Additional Information Updated	View Revisions
2017-10-13 11:03	nbv	Relationship added	related to 0028674
2017-10-19 15:23	nbv	Relationship added	child of 0029133
2019-09-04 13:04	abv	Target Version	7.4.0 => 7.5.0
2020-09-15 12:03	gka	Target Version	7.5.0 => 7.6.0*