0028687: Offset for open wire is built with incorrect direction

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0028687

Open CASCADE

[OCCT] OCCT:Modeling Algorithms

public

2017-04-25 17:24

2020-09-14 22:56

Reporter

nbv

Assigned To

msv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

Target Version

[OCCT] 7.6.0*

Fixed in Version

Summary

0028687: Offset for open wire is built with incorrect direction

Description

If the source wire is oriented correctly then the offset direction must be on the left side from the wire direction if offset value is negative and on the right side in case of positive offset value.

However, in some cases, this rule is not satisfied (see Steps To Reproduce).

Steps To Reproduce

    CASE # 1 (test bugs modalg_6 bug26296_5):

restore [locate_data_file bug26296_linesarc.brep] a
vori a
openoffset res a 1 6. i
# See Case 1.PNG

    CASE # 2 (bugs modalg_5 bug25334_9):
restore [locate_data_file bug25334_faceProlongationCrash1.brep] a
explode a e
wire ww a_3 a_4
donly ww
vori ww
openoffset res ww 1 10
# See Case 2.PNG

    CASE # 3 (bugs modalg_5 bug25334_4):
restore [locate_data_file bug25334_faceProlongationCrash1.brep] a
explode a e
wire ww a_3
donly ww
vori ww
openoffset res ww 1 -10
# See Case 3.PNG

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Attached Files

Case 1.PNG (14,601 bytes) 2017-04-25 17:24

Case 2.PNG (12,856 bytes) 2017-04-25 17:24

Case 3.PNG (13,028 bytes) 2017-04-25 17:24

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Notes
(0065516) nbv (developer) 2017-04-25 17:46	Cases ## 1 and 2 are reproduced on the current MASTER. Fix for the issue 0028677 solves this problem particularly. However, CASE # 3 is failed even after 0028677 will be fixed. The possible reason is in hard code in KPartCircle(...) function (see src\BRepFill\BRepFill_OffsetWire.cxx).

Issue History
Date Modified	Username	Field	Change
2017-04-25 17:24	nbv	New Issue
2017-04-25 17:24	nbv	Assigned To	=> msv
2017-04-25 17:24	nbv	File Added: Case 1.PNG
2017-04-25 17:24	nbv	File Added: Case 2.PNG
2017-04-25 17:24	nbv	File Added: Case 3.PNG
2017-04-25 17:46	nbv	Note Added: 0065516
2017-07-24 09:22	msv	Target Version	7.2.0 => 7.3.0
2017-12-05 17:01	msv	Target Version	7.3.0 => 7.4.0
2019-08-12 16:37	msv	Target Version	7.4.0 => 7.5.0
2020-09-14 22:56	msv	Target Version	7.5.0 => 7.6.0*