0022905: OFF 001 A6: 2d offset is not created due to invalid bisecting loci.

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0022905

Open CASCADE

[OCCT] OCCT:Modeling Algorithms

public

2012-01-16 10:43

2017-07-19 17:32

Reporter

skv

Assigned To

bugmaster

Priority

normal

Severity

minor

Status

feedback

Resolution

open

Platform

OS Version

Product Version

[OCCT] 6.5.4

Target Version

Fixed in Version

Summary

0022905: OFF 001 A6: 2d offset is not created due to invalid bisecting loci.

Description

This bug is detected in frames of the process of porting OCCT to Mandriva 2010.

On this OS the case OFF 001 A6 is failed. However on Mandriva 2008 (reference OS) this case succeeded.

2d offset computation algorithm consists of two steps:

1. Bisecting loci computation
2. Intersection of offsetted edges with these loci and result computation.

Deep analysis shows that the result of the first step is invalid on the both of OS: Mandriva 2008 and 2010 (see the attached figure). And the result of the second step basing on invalid input (the first step result) is unpredictable. It can give a good result (Mandriva 2008) or it can fail (Mandriva 2010).

Steps To Reproduce

To reproduce it in DRAW environment.

load the wire from the case OFF 001 A6.
mkplane f <wire>
topoload f
drawcont
mat
result
v2d2
2dfit

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Test case number

Attached Files

mat.jpg (22,131 bytes) 2012-01-16 10:43

Relationships

Notes
(0068439) mkv (tester) 2017-07-19 17:32	Problem described in issue is not actual for current state of OCCT

Issue History
Date Modified	Username	Field	Change
2012-01-16 10:43	skv	New Issue
2012-01-16 10:43	skv	Assigned To	=> jgv
2012-01-16 10:43	skv	File Added: mat.jpg
2017-07-19 17:32	mkv	Assigned To	jgv => bugmaster
2017-07-19 17:32	mkv	Status	new => feedback
2017-07-19 17:32	mkv	Note Added: 0068439