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0028279Community[OCCT] OCCT:Modeling Algorithmspublic2016-12-24 12:582017-12-05 16:59
Roman Lygin 
msv 
normalminor 
newopen 
[OCCT] 7.1.0 
[OCCT] 7.4.0* 
bugs modalg_7 bug28279
0028279: Greater oscillations and higher degree of resulting B-Spline in cylinder-cylinder intersections in 7.1.0
In 7.1.0 the surface-surface intersection algorithm produces resulting B-Spline curve which is somewhat greater distorted and has higher degree comparing to 7.0.
See screenshots.

This can be a consequence of the fix of 0023178.

It is impossible to claim the result is worse than in 7.0.0 (i.e. a regression) as there can be other factors to be taken into account (greater number of sampling points in the marching algorithm, etc). So this is rather a FYI for the OCC team to double-check as needed.
In both 7.0 and 7.1:
intersect r s1 s2
and zoom the result
No tags attached.
related to 0023178closed apn Intersection of cylinders fails to produce results 
zip 1010.zip (390) 2016-12-24 12:58
https://tracker.dev.opencascade.org/
png occ710_screenshot.png (21,453) 2016-12-24 12:58
https://tracker.dev.opencascade.org/
png occ700_screenshot.png (25,166) 2016-12-24 12:58
https://tracker.dev.opencascade.org/
Issue History
2016-12-24 12:58Roman LyginNew Issue
2016-12-24 12:58Roman LyginAssigned To => msv
2016-12-24 12:58Roman LyginFile Added: 1010.zip
2016-12-24 12:58Roman LyginFile Added: occ710_screenshot.png
2016-12-24 12:58Roman LyginFile Added: occ700_screenshot.png
2016-12-24 12:59Roman LyginRelationship addedrelated to 0023178
2017-07-21 11:22msvTarget Version7.2.0 => 7.3.0
2017-08-28 16:55mkvTest case number => bugs modalg_7 bug28279
2017-08-28 16:55mkvNote Added: 0069997
2017-12-05 16:59msvTarget Version7.3.0 => 7.4.0*

Notes
(0069997)
mkv   
2017-08-28 16:55   
Problem described in issue is reproduced on current state of OCCT.