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ID Project Category View Status Date Submitted Last Update 0025961 Open CASCADE OCCT:Modeling Algorithms public 2015-03-20 11:29 2023-08-01 15:08 nbv nbv normal minor assigned open Unscheduled 0025961: Wrong result of projection point on the ellipse If ellipse has major radius much more than minor radius we will not be able to find minimal distance between this ellipse and some point. Draw[]> ellipse ce 15793.1884865181, -5613.90386522167, -2450 0.566529531797242, 0.824041436823172, 4.04832179340053e-023 249106758.909924, 18 Draw[]> dset x1 15810.404909670384 Draw[]> dset y1 -5625.7401757733878 Draw[]> dset z1 -2468.0000000000000 Draw[]> proj ce x1 y1 z1 # parameter 1 = 3.141592653589798 #ext_1 parameter 2 = 4.7123890642550172 #ext_2 parameter 3 = 6.2831853071795809 #ext_3 parameter 4 = 6.2831853071795809 #ext_4 Draw[]> length ext_1 The length ext_1 is 249106779.80259019 Draw[]> length ext_2 The length ext_2 is 36.000000000000043 Draw[]> length ext_3 The length ext_3 is 249106738.01725906 Draw[]> length ext_4 The length ext_4 is 249106738.01725906 I.e. minimal distance between ellipse and point is 36.000000000000043. However, try the following script: Draw[]> cval ce pi/2 xx yy zz Draw[]> dset sd (xx-x1)*(xx-x1)+(yy-y1)*(yy-y1)+(zz-z1)*(zz-z1) # 436.50347299786017 Draw[]> dval sqrt(sd) # 20.892665531182473 Consequently, there is a point nearer to the given with distance 20.892665531182473. No tags attached.

#### Attached Files

 diff_images.png (40,605 bytes)

#### Activities

 nbv 2015-03-20 15:13 developer diff_images.png (40,605 bytes) nbv 2015-03-20 15:28 developer   ~0038738 The problem has been detected after fixing bug #25416 (differences in images were detected - see diff_images.png file). Intersection algorithm finds IntPatch_RLine and IntPatch_GLine (ellipse). These lines seem to be coincided (RLine is a part of GLine). However, it is not detected (in the function IsRLineGood(), file IntPatch_ImpImpIntersection_0.gxx) because computed distance between GLine and points of RLine is too big. Consequently, RLine is not excluded.

#### Issue History

Date Modified Username Field Change
2015-03-20 11:29 nbv New Issue
2015-03-20 11:29 nbv Assigned To => msv
2015-03-20 11:30 nbv Steps to Reproduce Updated
2015-03-20 12:45 msv Assigned To msv => nbv
2015-03-20 12:45 msv Status new => assigned
2015-03-20 15:13 nbv File Added: diff_images.png
2015-03-20 15:28 nbv Note Added: 0038738
2015-04-06 14:02 abv Target Version 6.9.0 => 7.1.0
2016-10-25 19:04 msv Target Version 7.1.0 => 7.2.0
2017-07-24 09:32 msv Target Version 7.2.0 => 7.3.0
2017-12-05 17:08 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 22:58 msv Target Version 7.5.0 => 7.6.0
2021-08-29 18:53 msv Target Version 7.6.0 => 7.7.0
2022-10-24 10:42 szy Target Version 7.7.0 => 7.8.0
2023-08-01 15:08 dpasukhi Target Version 7.8.0 => Unscheduled