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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0023177||Community||[OCCT] OCCT:Modeling Algorithms||public||2012-05-27 09:02||2017-09-29 16:25|
|Product Version||[OCCT] 6.5.3|
|Target Version||[OCCT] 7.2.0||Fixed in Version||[OCCT] 7.2.0|
|Summary||0023177: Intersection of plane and torus misses a result and never produces analytical result|
1. Missing solution
2. Unlike other elementary-elementary cases, torus/plane seems to never recognize analytical cases (e.g. circle or ellipse) and always produce B-Spline
|Steps To Reproduce||torus t 100 10|
plane p1 0 0 0 0 1 0
intersect r1 t p1
#only one solution is produced not two, and it is b-spline, not circle
plane p2 0 0 0 1 0 0
intersect r2 t p2
#two solutions are produced, and both are b-splines, not circles
plane p3 5 0 0 1 0 0
intersect r3 t p3
#two solutions are produced, and both are b-splines, not ellipses
|Tags||No tags attached.|
|Test case number||bugs modalg_6 bug23177_1, bug23177_2|
The first problem is confirmed: one curve is missing. Note that DRAW command intersect should output list of objects it produced.
For the second and third problems, I have serious doubts. First, strictly speaking, intersection of torus and plane is never an ellipse: it is either a circle or a more complex curve. Recognition of special degenerated cases like example 2 (when plane is aligned with axes of the torus) to produce circle(s) instead of b-spline(s) would require additional effort and introduce (unnecessary) complexity.
Roman Lygin (developer)
Andrey, my error on ellipse section - please disregard that. Indeed, it's either circles or other types
(a few quick links - http://isolatium.uhh.hawaii.edu/m206L/student/torus/torus.htm, [^] http://mathworld.wolfram.com/ToricSection.html, [^] http://en.wikipedia.org/wiki/Villarceau_circles [^])
Anyway, having an analytical solution is good for downstream algorithms which will use result of intersection.
It *will* require additional effort but "complexity" will be consistent with other supported cases in IntAna (cylinders, cones, spheres,...).
|The described problems have been fixed: it works as expected since OCCT 6.9.1. I suggest we should add a test case and close the issue.|
|Dear Nikolay, please create a test case for this bug.|
Branch CR23177 has been created by nbv.
Detailed log of new commits:
Date: Mon May 29 17:35:06 2017 +0300
0023177: Intersection of plane and torus misses a result and never produces analytical result
Creation of the test case.
Please review CR23177 branch.
Mote that there is no need to compile occt and perform all tests.
Please integrate branch CR23177 into the occt git-repository master.
Branch CR23177 has been deleted by inv.
occt: master 75b9688a
Timestamp: 2017-05-29 14:35:06
|0023177: Intersection of plane and torus misses a result and never produces analytical result
Creation of the test case.
|add - tests/bugs/modalg_6/bug23177_1|
|add - tests/bugs/modalg_6/bug23177_2|
|2012-05-27 09:02||Roman Lygin||New Issue|
|2012-05-27 09:02||Roman Lygin||Assigned To||=> jgv|
|2012-05-31 08:15||abv||Note Added: 0020609|
|2012-05-31 08:15||abv||Status||new => assigned|
|2012-05-31 22:38||Roman Lygin||Note Added: 0020627|
|2017-05-28 19:10||abv||Note Added: 0066690|
|2017-05-28 19:10||abv||Assigned To||jgv => bugmaster|
|2017-05-28 19:10||abv||Status||assigned => feedback|
|2017-05-29 15:42||msv||Note Added: 0066728|
|2017-05-29 15:42||msv||Assigned To||bugmaster => nbv|
|2017-05-29 15:42||msv||Status||feedback => assigned|
|2017-05-29 17:37||git||Note Added: 0066821|
|2017-05-29 17:37||nbv||Note Added: 0066822|
|2017-05-29 17:37||nbv||Assigned To||nbv => msv|
|2017-05-29 17:37||nbv||Status||assigned => resolved|
|2017-05-29 19:00||msv||Note Added: 0066839|
|2017-05-29 19:00||msv||Assigned To||msv => bugmaster|
|2017-05-29 19:00||msv||Status||resolved => reviewed|
|2017-05-29 19:21||apv||Assigned To||bugmaster => apv|
|2017-05-30 07:19||emv||Relationship added||related to 0024470|
|2017-05-30 12:08||apv||Test case number||=> bugs modalg_6 bug23177_1, bug23177_2|
|2017-05-30 12:25||apv||Note Added: 0066866|
|2017-05-30 12:25||apv||Assigned To||apv => bugmaster|
|2017-05-30 12:25||apv||Status||reviewed => tested|
|2017-06-01 09:57||bugmaster||Target Version||=> 7.2.0|
|2017-06-02 10:28||bugmaster||Changeset attached||=> occt master 75b9688a|
|2017-06-02 10:28||bugmaster||Status||tested => verified|
|2017-06-02 10:28||bugmaster||Resolution||open => fixed|
|2017-06-02 10:45||git||Note Added: 0066991|
|2017-09-29 16:18||aiv||Fixed in Version||=> 7.2.0|
|2017-09-29 16:25||aiv||Status||verified => closed|
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