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

ID	Project	Category	View Status	Date Submitted	Last Update

0022905	Open CASCADE	OCCT:Modeling Algorithms	public	2012-01-16 10:43	2021-05-14 10:04

Reporter	~~skv~~	Assigned To	bugmaster
Priority	normal	Severity	minor
Status	closed	Resolution	no change required
Platform	A	OS	L
Product Version	6.5.4

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
Tags	No tags attached.

Test case number

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
2021-05-14 10:04	bugmaster	Status	feedback => closed
2021-05-14 10:04	bugmaster	Resolution	open => no change required

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

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