From a6ebe9fc7c1dc34a5b2c375d9849d1020efd4282 Mon Sep 17 00:00:00 2001
From: nbv <nbv@opencascade.com>
Date: Fri, 26 Oct 2018 14:06:28 +0300
Subject: [PATCH] 0028493: [Regression vs 7.0.0] Intersection algorithm
 produces curve with loop

1. New testgrid "lowalgos/intss" has been created. It will contain all test cases on geometrical intersection of two surfaces ("intersect" DRAW-command) and two faces ("bopcurves" DRAW-command).

2. New test case for the issue #28493 has been created because the problem is not reproduced on MASTER.

3. Test case (lowalgos/intss/bug24472) for the issue #29501 has been modified in order to check loops of the resulting intersection curves.
---
 tests/lowalgos/grids.list                     |  3 +-
 tests/lowalgos/intss/begin                    | 30 ++++++++++++++++
 .../moddata_1 => lowalgos/intss}/buc60623_3   |  0
 .../moddata_1 => lowalgos/intss}/buc60815     |  0
 .../{bugs/moddata_1 => lowalgos/intss}/bug106 |  0
 .../{bugs/moddata_1 => lowalgos/intss}/bug139 |  0
 .../moddata_1 => lowalgos/intss}/bug20524     |  0
 .../moddata_1 => lowalgos/intss}/bug20766     |  0
 .../modalg_7 => lowalgos/intss}/bug21494      |  0
 .../modalg_6 => lowalgos/intss}/bug21750      |  0
 .../moddata_1 => lowalgos/intss}/bug22720     |  0
 .../moddata_1 => lowalgos/intss}/bug22723     |  0
 .../modalg_5 => lowalgos/intss}/bug22766      |  0
 .../moddata_2 => lowalgos/intss}/bug22851     |  0
 .../moddata_2 => lowalgos/intss}/bug22923     |  0
 .../modalg_7 => lowalgos/intss}/bug23163_1    |  0
 .../modalg_7 => lowalgos/intss}/bug23163_2    |  0
 .../modalg_7 => lowalgos/intss}/bug23163_3    |  0
 .../modalg_7 => lowalgos/intss}/bug23166      |  0
 .../modalg_7 => lowalgos/intss}/bug23176      |  0
 .../modalg_6 => lowalgos/intss}/bug23177_1    |  0
 .../modalg_6 => lowalgos/intss}/bug23177_2    |  0
 .../modalg_6 => lowalgos/intss}/bug23178      |  0
 .../modalg_2 => lowalgos/intss}/bug23218      |  0
 .../moddata_3 => lowalgos/intss}/bug23471     |  0
 .../moddata_2 => lowalgos/intss}/bug23576     |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug236 |  0
 .../moddata_2 => lowalgos/intss}/bug23643     |  0
 .../moddata_2 => lowalgos/intss}/bug23644     |  0
 .../modalg_2 => lowalgos/intss}/bug23699      |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug237 |  0
 .../modalg_2 => lowalgos/intss}/bug23732      |  0
 .../modalg_5 => lowalgos/intss}/bug23948_1    |  0
 .../modalg_5 => lowalgos/intss}/bug23948_2    |  0
 .../modalg_7 => lowalgos/intss}/bug23972      |  0
 .../moddata_3 => lowalgos/intss}/bug23981     |  0
 .../moddata_3 => lowalgos/intss}/bug24142     |  0
 .../modalg_5 => lowalgos/intss}/bug24299      |  0
 .../modalg_5 => lowalgos/intss}/bug24313      |  0
 .../modalg_7 => lowalgos/intss}/bug24418_1    |  0
 .../modalg_7 => lowalgos/intss}/bug24418_2    |  0
 .../moddata_3 => lowalgos/intss}/bug24427_2   |  0
 .../modalg_7 => lowalgos/intss}/bug24429      |  0
 .../modalg_5 => lowalgos/intss}/bug24472      |  6 ++++
 .../modalg_5 => lowalgos/intss}/bug24505      |  0
 .../modalg_5 => lowalgos/intss}/bug24585_1    |  0
 .../modalg_5 => lowalgos/intss}/bug24612      |  0
 .../modalg_5 => lowalgos/intss}/bug24643      |  0
 .../modalg_5 => lowalgos/intss}/bug24648      |  0
 .../modalg_5 => lowalgos/intss}/bug24650      |  0
 .../modalg_7 => lowalgos/intss}/bug24676      |  0
 .../modalg_7 => lowalgos/intss}/bug24772      |  0
 .../modalg_5 => lowalgos/intss}/bug24915      |  0
 .../moddata_3 => lowalgos/intss}/bug25095     |  0
 .../modalg_5 => lowalgos/intss}/bug25193      |  0
 .../modalg_5 => lowalgos/intss}/bug25224      |  0
 .../modalg_5 => lowalgos/intss}/bug25248      |  0
 .../modalg_5 => lowalgos/intss}/bug25292_11   |  0
 .../modalg_5 => lowalgos/intss}/bug25292_12   |  0
 .../modalg_5 => lowalgos/intss}/bug25292_21   |  0
 .../modalg_5 => lowalgos/intss}/bug25292_22   |  0
 .../modalg_5 => lowalgos/intss}/bug25292_31   |  0
 .../modalg_5 => lowalgos/intss}/bug25292_32   |  0
 .../modalg_5 => lowalgos/intss}/bug25380      |  0
 .../modalg_5 => lowalgos/intss}/bug25416_1    |  0
 .../modalg_5 => lowalgos/intss}/bug25416_2    |  0
 .../modalg_5 => lowalgos/intss}/bug25416_3    |  0
 .../modalg_5 => lowalgos/intss}/bug25465_1    |  0
 .../modalg_5 => lowalgos/intss}/bug25465_2    |  0
 .../modalg_5 => lowalgos/intss}/bug25488      |  0
 .../modalg_5 => lowalgos/intss}/bug25697_2    |  0
 .../moddata_3 => lowalgos/intss}/bug25782_1   |  0
 .../moddata_3 => lowalgos/intss}/bug25782_2   |  0
 .../modalg_5 => lowalgos/intss}/bug25818      |  0
 .../modalg_6 => lowalgos/intss}/bug25820_1    |  0
 .../modalg_6 => lowalgos/intss}/bug25820_2    |  0
 .../modalg_6 => lowalgos/intss}/bug25820_3    |  0
 .../modalg_5 => lowalgos/intss}/bug25828_3    |  0
 .../modalg_5 => lowalgos/intss}/bug25828_4    |  0
 .../modalg_5 => lowalgos/intss}/bug25842      |  0
 .../modalg_6 => lowalgos/intss}/bug25890      |  0
 .../modalg_5 => lowalgos/intss}/bug25898      |  0
 .../modalg_6 => lowalgos/intss}/bug26008      |  0
 .../modalg_6 => lowalgos/intss}/bug26151_1    |  0
 .../modalg_6 => lowalgos/intss}/bug26151_2    |  0
 .../modalg_6 => lowalgos/intss}/bug26251      |  0
 .../modalg_6 => lowalgos/intss}/bug26352      |  0
 .../modalg_6 => lowalgos/intss}/bug26431_1    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_1    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_2    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_3    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_4    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_5    |  0
 .../modalg_7 => lowalgos/intss}/bug26509_6    |  0
 .../modalg_6 => lowalgos/intss}/bug26576_1    |  0
 .../modalg_6 => lowalgos/intss}/bug26576_3    |  0
 .../modalg_6 => lowalgos/intss}/bug26576_4    |  0
 .../modalg_6 => lowalgos/intss}/bug26675      |  0
 .../modalg_6 => lowalgos/intss}/bug26684_1    |  0
 .../modalg_6 => lowalgos/intss}/bug26684_2    |  0
 .../modalg_6 => lowalgos/intss}/bug26699      |  0
 .../modalg_6 => lowalgos/intss}/bug26748      |  0
 .../modalg_6 => lowalgos/intss}/bug26894      |  0
 .../modalg_6 => lowalgos/intss}/bug27079_1    |  0
 .../modalg_6 => lowalgos/intss}/bug27079_2    |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug271 |  0
 .../modalg_6 => lowalgos/intss}/bug27175      |  0
 .../modalg_6 => lowalgos/intss}/bug27190      |  0
 .../modalg_7 => lowalgos/intss}/bug27227      |  0
 .../modalg_6 => lowalgos/intss}/bug27252_1    |  0
 .../modalg_6 => lowalgos/intss}/bug27263      |  0
 .../modalg_6 => lowalgos/intss}/bug27269      |  0
 .../modalg_6 => lowalgos/intss}/bug27282_2    |  0
 .../modalg_6 => lowalgos/intss}/bug27302      |  0
 .../modalg_6 => lowalgos/intss}/bug27310_1    |  0
 .../modalg_6 => lowalgos/intss}/bug27310_2    |  0
 .../modalg_6 => lowalgos/intss}/bug27431      |  0
 .../modalg_7 => lowalgos/intss}/bug27623      |  0
 .../modalg_6 => lowalgos/intss}/bug27664_1    |  0
 .../modalg_7 => lowalgos/intss}/bug27747      |  0
 .../modalg_6 => lowalgos/intss}/bug27766      |  0
 .../modalg_6 => lowalgos/intss}/bug27780      |  0
 .../modalg_6 => lowalgos/intss}/bug27842      |  0
 .../modalg_6 => lowalgos/intss}/bug27856_2    |  0
 .../modalg_6 => lowalgos/intss}/bug27896      |  0
 .../modalg_6 => lowalgos/intss}/bug27937_1    |  0
 .../modalg_6 => lowalgos/intss}/bug27937_2    |  0
 .../modalg_7 => lowalgos/intss}/bug27950      |  0
 .../modalg_6 => lowalgos/intss}/bug28009_2    |  0
 .../modalg_6 => lowalgos/intss}/bug28012      |  0
 .../modalg_7 => lowalgos/intss}/bug28085_2    |  0
 .../modalg_6 => lowalgos/intss}/bug28222_1    |  0
 .../modalg_6 => lowalgos/intss}/bug28222_2    |  0
 .../modalg_6 => lowalgos/intss}/bug28222_3    |  0
 .../modalg_7 => lowalgos/intss}/bug28406      |  0
 tests/lowalgos/intss/bug28493                 | 36 +++++++++++++++++++
 .../modalg_7 => lowalgos/intss}/bug28544_2    |  0
 .../modalg_7 => lowalgos/intss}/bug28557      |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug286 |  0
 .../modalg_6 => lowalgos/intss}/bug28718      |  0
 .../modalg_7 => lowalgos/intss}/bug28764      |  0
 .../modalg_7 => lowalgos/intss}/bug28984      |  0
 .../modalg_7 => lowalgos/intss}/bug29103      |  0
 .../modalg_7 => lowalgos/intss}/bug29323      |  0
 .../modalg_7 => lowalgos/intss}/bug29494      |  0
 .../intss}/bug29807_i1001                     |  0
 .../intss}/bug29807_i1002                     |  0
 .../intss}/bug29807_i1003                     |  0
 .../intss}/bug29807_i1004                     |  0
 .../intss}/bug29807_i1005                     |  0
 .../intss}/bug29807_i1006                     |  0
 .../intss}/bug29807_i2001                     |  0
 .../intss}/bug29807_i2002                     |  0
 .../intss}/bug29807_i2003                     |  0
 .../intss}/bug29807_i2004                     |  0
 .../intss}/bug29807_i2005                     |  0
 .../intss}/bug29807_i2006                     |  0
 .../intss}/bug29807_i3001                     |  0
 .../intss}/bug29807_i3002                     |  0
 .../intss}/bug29807_i3003                     |  0
 .../intss}/bug29807_i3004                     |  0
 .../intss}/bug29807_i3005                     |  0
 .../intss}/bug29807_i4001                     |  0
 .../intss}/bug29807_i4002                     |  0
 .../intss}/bug29807_i4003                     |  0
 .../intss}/bug29807_i4004                     |  0
 .../intss}/bug29807_i4005                     |  0
 .../intss}/bug29807_i5001                     |  0
 .../intss}/bug29807_i5002                     |  0
 .../modalg_7 => lowalgos/intss}/bug29866      |  0
 .../modalg_7 => lowalgos/intss}/bug29910_2    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_1    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_2    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_3    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_4    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_5    |  0
 .../modalg_7 => lowalgos/intss}/bug29972_6    |  0
 .../modalg_7 => lowalgos/intss}/bug29994      |  0
 .../modalg_7 => lowalgos/intss}/bug30082_1    |  0
 .../modalg_7 => lowalgos/intss}/bug30082_2    |  0
 .../modalg_7 => lowalgos/intss}/bug30100_2    |  0
 .../modalg_7 => lowalgos/intss}/bug30202_2    |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug324 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug333 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug370 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug371 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug429 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug431 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug504 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug513 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug531 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug537 |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug565 |  0
 .../moddata_2 => lowalgos/intss}/bug567_1     |  0
 .../moddata_2 => lowalgos/intss}/bug567_2     |  0
 .../{bugs/moddata_2 => lowalgos/intss}/bug604 |  0
 .../moddata_2 => lowalgos/intss}/bug6474      |  0
 .../moddata_2 => lowalgos/intss}/ger61235     |  0
 198 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 tests/lowalgos/intss/begin
 rename tests/{bugs/moddata_1 => lowalgos/intss}/buc60623_3 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/buc60815 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug106 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug139 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug20524 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug20766 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug21494 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug21750 (100%)
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug22720 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_1 => lowalgos/intss}/bug22723 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug22766 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug22851 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug22923 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23163_1 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23163_2 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23163_3 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23166 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23176 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug23177_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug23177_2 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug23178 (100%)
 rename tests/{bugs/modalg_2 => lowalgos/intss}/bug23218 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug23471 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug23576 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug236 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug23643 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug23644 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_2 => lowalgos/intss}/bug23699 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug237 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_2 => lowalgos/intss}/bug23732 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug23948_1 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug23948_2 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug23972 (100%)
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug23981 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug24142 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24299 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24313 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug24418_1 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug24418_2 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug24427_2 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug24429 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24472 (94%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24505 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24585_1 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24612 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24643 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24648 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24650 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug24676 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug24772 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug24915 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug25095 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25193 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25224 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25248 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_11 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_12 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_21 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_22 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_31 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25292_32 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25380 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25416_1 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25416_2 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25416_3 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25465_1 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25465_2 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25488 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25697_2 (100%)
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug25782_1 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_3 => lowalgos/intss}/bug25782_2 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25818 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug25820_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug25820_2 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug25820_3 (100%)
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25828_3 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25828_4 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25842 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug25890 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_5 => lowalgos/intss}/bug25898 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26008 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26151_1 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26151_2 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26251 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26352 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26431_1 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_1 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_2 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_3 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_4 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_5 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug26509_6 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26576_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26576_3 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26576_4 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26675 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26684_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26684_2 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26699 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26748 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug26894 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27079_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27079_2 (100%)
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug271 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27175 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27190 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug27227 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27252_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27263 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27269 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27282_2 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27302 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27310_1 (100%)
 rename tests/{bugs/modalg_6 => lowalgos/intss}/bug27310_2 (100%)
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 mode change 100755 => 100644
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 create mode 100644 tests/lowalgos/intss/bug28493
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug28544_2 (100%)
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 mode change 100755 => 100644
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 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i2003 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i2004 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i2005 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i2006 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i3001 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i3002 (100%)
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 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i3004 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i3005 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i4001 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i4002 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i4003 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i4004 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i4005 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29807_i5001 (100%)
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 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29866 (100%)
 rename tests/{bugs/modalg_7 => lowalgos/intss}/bug29910_2 (100%)
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
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 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug537 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug565 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug567_1 (100%)
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug567_2 (100%)
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug604 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/bug6474 (100%)
 mode change 100755 => 100644
 rename tests/{bugs/moddata_2 => lowalgos/intss}/ger61235 (100%)
 mode change 100755 => 100644

diff --git a/tests/lowalgos/grids.list b/tests/lowalgos/grids.list
index c3848ca3b3..5d4e4d5ba4 100644
--- a/tests/lowalgos/grids.list
+++ b/tests/lowalgos/grids.list
@@ -2,4 +2,5 @@
 002 bnd
 003 extcs
 004 extcc
-005 2dgcc
\ No newline at end of file
+005 2dgcc
+006 intss
\ No newline at end of file
diff --git a/tests/lowalgos/intss/begin b/tests/lowalgos/intss/begin
new file mode 100644
index 0000000000..b9d05984d3
--- /dev/null
+++ b/tests/lowalgos/intss/begin
@@ -0,0 +1,30 @@
+# Checks whether theCurve has a loop/bend
+# Use: CheckLoops curve CosMaxAngle [theNbPoints]}
+# theNbPoints sets the interval of discretization;
+# theCosMaxAngle sets the maximal rotation angle between two adjacent segments. This value must be equal to the cosine of this angle.
+
+help CheckLoops {curve CosMaxAngle theNbPoints }
+proc CheckLoops {theCurve theCosMaxAngle {theNbPoints 1000.0}} {
+  upvar #0 $theCurve aCurve
+  bounds aCurve U1 U2
+    
+  set delta [dval (U2-U1)/$theNbPoints]
+  cvalue aCurve [dval U1] xp yp zp dx1 dy1 dz1
+  
+  for {set p [dval U1]} {$p <= [dval U2]} {set p [expr $p + $delta]} {
+    cvalue aCurve $p xp yp zp dx2 dy2 dz2
+    
+    #Check if the angle between the vectors {dx1 dy1 dz1} and {dx2 dy2 dz2} is less than 30deg.
+    set nv1 [ dval dx1*dx1+dy1*dy1+dz1*dz1 ] 
+    set nv2 [ dval dx2*dx2+dy2*dy2+dz2*dz2 ] 
+    set dp [ dval dx1*dx2+dy2*dy2+dz1*dz2 ] 
+    
+    if {$dp < [ expr $theCosMaxAngle * sqrt($nv1 * $nv2) ] } {
+      puts "Error: The curve aCurve is possible to have a bend at parameter $p. Please check carefully"
+    }      
+    
+    dset dx1 dx2
+    dset dy1 dy2
+    dset dz1 dz2
+  }
+}
diff --git a/tests/bugs/moddata_1/buc60623_3 b/tests/lowalgos/intss/buc60623_3
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/buc60623_3
rename to tests/lowalgos/intss/buc60623_3
diff --git a/tests/bugs/moddata_1/buc60815 b/tests/lowalgos/intss/buc60815
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/buc60815
rename to tests/lowalgos/intss/buc60815
diff --git a/tests/bugs/moddata_1/bug106 b/tests/lowalgos/intss/bug106
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug106
rename to tests/lowalgos/intss/bug106
diff --git a/tests/bugs/moddata_1/bug139 b/tests/lowalgos/intss/bug139
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug139
rename to tests/lowalgos/intss/bug139
diff --git a/tests/bugs/moddata_1/bug20524 b/tests/lowalgos/intss/bug20524
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug20524
rename to tests/lowalgos/intss/bug20524
diff --git a/tests/bugs/moddata_1/bug20766 b/tests/lowalgos/intss/bug20766
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug20766
rename to tests/lowalgos/intss/bug20766
diff --git a/tests/bugs/modalg_7/bug21494 b/tests/lowalgos/intss/bug21494
similarity index 100%
rename from tests/bugs/modalg_7/bug21494
rename to tests/lowalgos/intss/bug21494
diff --git a/tests/bugs/modalg_6/bug21750 b/tests/lowalgos/intss/bug21750
similarity index 100%
rename from tests/bugs/modalg_6/bug21750
rename to tests/lowalgos/intss/bug21750
diff --git a/tests/bugs/moddata_1/bug22720 b/tests/lowalgos/intss/bug22720
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug22720
rename to tests/lowalgos/intss/bug22720
diff --git a/tests/bugs/moddata_1/bug22723 b/tests/lowalgos/intss/bug22723
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_1/bug22723
rename to tests/lowalgos/intss/bug22723
diff --git a/tests/bugs/modalg_5/bug22766 b/tests/lowalgos/intss/bug22766
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_5/bug22766
rename to tests/lowalgos/intss/bug22766
diff --git a/tests/bugs/moddata_2/bug22851 b/tests/lowalgos/intss/bug22851
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_2/bug22851
rename to tests/lowalgos/intss/bug22851
diff --git a/tests/bugs/moddata_2/bug22923 b/tests/lowalgos/intss/bug22923
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_2/bug22923
rename to tests/lowalgos/intss/bug22923
diff --git a/tests/bugs/modalg_7/bug23163_1 b/tests/lowalgos/intss/bug23163_1
similarity index 100%
rename from tests/bugs/modalg_7/bug23163_1
rename to tests/lowalgos/intss/bug23163_1
diff --git a/tests/bugs/modalg_7/bug23163_2 b/tests/lowalgos/intss/bug23163_2
similarity index 100%
rename from tests/bugs/modalg_7/bug23163_2
rename to tests/lowalgos/intss/bug23163_2
diff --git a/tests/bugs/modalg_7/bug23163_3 b/tests/lowalgos/intss/bug23163_3
similarity index 100%
rename from tests/bugs/modalg_7/bug23163_3
rename to tests/lowalgos/intss/bug23163_3
diff --git a/tests/bugs/modalg_7/bug23166 b/tests/lowalgos/intss/bug23166
similarity index 100%
rename from tests/bugs/modalg_7/bug23166
rename to tests/lowalgos/intss/bug23166
diff --git a/tests/bugs/modalg_7/bug23176 b/tests/lowalgos/intss/bug23176
similarity index 100%
rename from tests/bugs/modalg_7/bug23176
rename to tests/lowalgos/intss/bug23176
diff --git a/tests/bugs/modalg_6/bug23177_1 b/tests/lowalgos/intss/bug23177_1
similarity index 100%
rename from tests/bugs/modalg_6/bug23177_1
rename to tests/lowalgos/intss/bug23177_1
diff --git a/tests/bugs/modalg_6/bug23177_2 b/tests/lowalgos/intss/bug23177_2
similarity index 100%
rename from tests/bugs/modalg_6/bug23177_2
rename to tests/lowalgos/intss/bug23177_2
diff --git a/tests/bugs/modalg_6/bug23178 b/tests/lowalgos/intss/bug23178
similarity index 100%
rename from tests/bugs/modalg_6/bug23178
rename to tests/lowalgos/intss/bug23178
diff --git a/tests/bugs/modalg_2/bug23218 b/tests/lowalgos/intss/bug23218
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_2/bug23218
rename to tests/lowalgos/intss/bug23218
diff --git a/tests/bugs/moddata_3/bug23471 b/tests/lowalgos/intss/bug23471
old mode 100755
new mode 100644
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rename from tests/bugs/moddata_3/bug23471
rename to tests/lowalgos/intss/bug23471
diff --git a/tests/bugs/moddata_2/bug23576 b/tests/lowalgos/intss/bug23576
old mode 100755
new mode 100644
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rename from tests/bugs/moddata_2/bug23576
rename to tests/lowalgos/intss/bug23576
diff --git a/tests/bugs/moddata_2/bug236 b/tests/lowalgos/intss/bug236
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_2/bug236
rename to tests/lowalgos/intss/bug236
diff --git a/tests/bugs/moddata_2/bug23643 b/tests/lowalgos/intss/bug23643
old mode 100755
new mode 100644
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rename from tests/bugs/moddata_2/bug23643
rename to tests/lowalgos/intss/bug23643
diff --git a/tests/bugs/moddata_2/bug23644 b/tests/lowalgos/intss/bug23644
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_2/bug23644
rename to tests/lowalgos/intss/bug23644
diff --git a/tests/bugs/modalg_2/bug23699 b/tests/lowalgos/intss/bug23699
old mode 100755
new mode 100644
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rename from tests/bugs/modalg_2/bug23699
rename to tests/lowalgos/intss/bug23699
diff --git a/tests/bugs/moddata_2/bug237 b/tests/lowalgos/intss/bug237
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_2/bug237
rename to tests/lowalgos/intss/bug237
diff --git a/tests/bugs/modalg_2/bug23732 b/tests/lowalgos/intss/bug23732
old mode 100755
new mode 100644
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rename from tests/bugs/modalg_2/bug23732
rename to tests/lowalgos/intss/bug23732
diff --git a/tests/bugs/modalg_5/bug23948_1 b/tests/lowalgos/intss/bug23948_1
similarity index 100%
rename from tests/bugs/modalg_5/bug23948_1
rename to tests/lowalgos/intss/bug23948_1
diff --git a/tests/bugs/modalg_5/bug23948_2 b/tests/lowalgos/intss/bug23948_2
similarity index 100%
rename from tests/bugs/modalg_5/bug23948_2
rename to tests/lowalgos/intss/bug23948_2
diff --git a/tests/bugs/modalg_7/bug23972 b/tests/lowalgos/intss/bug23972
similarity index 100%
rename from tests/bugs/modalg_7/bug23972
rename to tests/lowalgos/intss/bug23972
diff --git a/tests/bugs/moddata_3/bug23981 b/tests/lowalgos/intss/bug23981
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_3/bug23981
rename to tests/lowalgos/intss/bug23981
diff --git a/tests/bugs/moddata_3/bug24142 b/tests/lowalgos/intss/bug24142
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/moddata_3/bug24142
rename to tests/lowalgos/intss/bug24142
diff --git a/tests/bugs/modalg_5/bug24299 b/tests/lowalgos/intss/bug24299
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_5/bug24299
rename to tests/lowalgos/intss/bug24299
diff --git a/tests/bugs/modalg_5/bug24313 b/tests/lowalgos/intss/bug24313
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_5/bug24313
rename to tests/lowalgos/intss/bug24313
diff --git a/tests/bugs/modalg_7/bug24418_1 b/tests/lowalgos/intss/bug24418_1
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_7/bug24418_1
rename to tests/lowalgos/intss/bug24418_1
diff --git a/tests/bugs/modalg_7/bug24418_2 b/tests/lowalgos/intss/bug24418_2
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_7/bug24418_2
rename to tests/lowalgos/intss/bug24418_2
diff --git a/tests/bugs/moddata_3/bug24427_2 b/tests/lowalgos/intss/bug24427_2
similarity index 100%
rename from tests/bugs/moddata_3/bug24427_2
rename to tests/lowalgos/intss/bug24427_2
diff --git a/tests/bugs/modalg_7/bug24429 b/tests/lowalgos/intss/bug24429
similarity index 100%
rename from tests/bugs/modalg_7/bug24429
rename to tests/lowalgos/intss/bug24429
diff --git a/tests/bugs/modalg_5/bug24472 b/tests/lowalgos/intss/bug24472
old mode 100755
new mode 100644
similarity index 94%
rename from tests/bugs/modalg_5/bug24472
rename to tests/lowalgos/intss/bug24472
index 897851b1d3..83b61430fa
--- a/tests/bugs/modalg_5/bug24472
+++ b/tests/lowalgos/intss/bug24472
@@ -32,6 +32,9 @@ foreach c [directory ii12*] {
     puts "Error: Wrong curve's range!"
   }
   
+  # cos(~75.5deg)
+  CheckLoops $c 0.25
+  
   xdistcs $c s1 U1 U2 10 $MaxToler
   xdistcs $c s2 U1 U2 10 $MaxToler
 }
@@ -58,6 +61,9 @@ foreach c [directory ii13*] {
     puts "Error: Wrong curve's range!"
   }
   
+  # cos(~75.5deg)
+  CheckLoops $c 0.25
+
   xdistcs $c s1 U1 U2 10 $MaxToler
   xdistcs $c s2 U1 U2 10 $MaxToler
 }
diff --git a/tests/bugs/modalg_5/bug24505 b/tests/lowalgos/intss/bug24505
similarity index 100%
rename from tests/bugs/modalg_5/bug24505
rename to tests/lowalgos/intss/bug24505
diff --git a/tests/bugs/modalg_5/bug24585_1 b/tests/lowalgos/intss/bug24585_1
similarity index 100%
rename from tests/bugs/modalg_5/bug24585_1
rename to tests/lowalgos/intss/bug24585_1
diff --git a/tests/bugs/modalg_5/bug24612 b/tests/lowalgos/intss/bug24612
similarity index 100%
rename from tests/bugs/modalg_5/bug24612
rename to tests/lowalgos/intss/bug24612
diff --git a/tests/bugs/modalg_5/bug24643 b/tests/lowalgos/intss/bug24643
old mode 100755
new mode 100644
similarity index 100%
rename from tests/bugs/modalg_5/bug24643
rename to tests/lowalgos/intss/bug24643
diff --git a/tests/bugs/modalg_5/bug24648 b/tests/lowalgos/intss/bug24648
similarity index 100%
rename from tests/bugs/modalg_5/bug24648
rename to tests/lowalgos/intss/bug24648
diff --git a/tests/bugs/modalg_5/bug24650 b/tests/lowalgos/intss/bug24650
similarity index 100%
rename from tests/bugs/modalg_5/bug24650
rename to tests/lowalgos/intss/bug24650
diff --git a/tests/bugs/modalg_7/bug24676 b/tests/lowalgos/intss/bug24676
similarity index 100%
rename from tests/bugs/modalg_7/bug24676
rename to tests/lowalgos/intss/bug24676
diff --git a/tests/bugs/modalg_7/bug24772 b/tests/lowalgos/intss/bug24772
similarity index 100%
rename from tests/bugs/modalg_7/bug24772
rename to tests/lowalgos/intss/bug24772
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old mode 100755
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rename from tests/bugs/modalg_5/bug24915
rename to tests/lowalgos/intss/bug24915
diff --git a/tests/bugs/moddata_3/bug25095 b/tests/lowalgos/intss/bug25095
similarity index 100%
rename from tests/bugs/moddata_3/bug25095
rename to tests/lowalgos/intss/bug25095
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old mode 100755
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rename to tests/lowalgos/intss/bug25193
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rename to tests/lowalgos/intss/bug25224
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old mode 100755
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rename from tests/bugs/modalg_5/bug25248
rename to tests/lowalgos/intss/bug25248
diff --git a/tests/bugs/modalg_5/bug25292_11 b/tests/lowalgos/intss/bug25292_11
similarity index 100%
rename from tests/bugs/modalg_5/bug25292_11
rename to tests/lowalgos/intss/bug25292_11
diff --git a/tests/bugs/modalg_5/bug25292_12 b/tests/lowalgos/intss/bug25292_12
similarity index 100%
rename from tests/bugs/modalg_5/bug25292_12
rename to tests/lowalgos/intss/bug25292_12
diff --git a/tests/bugs/modalg_5/bug25292_21 b/tests/lowalgos/intss/bug25292_21
similarity index 100%
rename from tests/bugs/modalg_5/bug25292_21
rename to tests/lowalgos/intss/bug25292_21
diff --git a/tests/bugs/modalg_5/bug25292_22 b/tests/lowalgos/intss/bug25292_22
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diff --git a/tests/bugs/modalg_6/bug26576_1 b/tests/lowalgos/intss/bug26576_1
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diff --git a/tests/bugs/modalg_6/bug26675 b/tests/lowalgos/intss/bug26675
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similarity index 100%
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diff --git a/tests/bugs/moddata_2/bug271 b/tests/lowalgos/intss/bug271
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diff --git a/tests/bugs/modalg_6/bug27175 b/tests/lowalgos/intss/bug27175
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diff --git a/tests/bugs/modalg_6/bug27269 b/tests/lowalgos/intss/bug27269
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diff --git a/tests/bugs/modalg_6/bug28222_3 b/tests/lowalgos/intss/bug28222_3
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diff --git a/tests/bugs/modalg_7/bug28406 b/tests/lowalgos/intss/bug28406
similarity index 100%
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rename to tests/lowalgos/intss/bug28406
diff --git a/tests/lowalgos/intss/bug28493 b/tests/lowalgos/intss/bug28493
new file mode 100644
index 0000000000..f05c911fdb
--- /dev/null
+++ b/tests/lowalgos/intss/bug28493
@@ -0,0 +1,36 @@
+puts "========"
+puts "0028493: Intersection algorithm produces curve with loop"
+puts "========"
+puts ""
+
+foreach a [directory c*] {unset $a}
+
+restore [locate_data_file bug28491_H0.brep] h0
+restore [locate_data_file bug28491_Prism.brep] s1
+explode h0 f
+
+regexp {Tolerance Reached=+([-0-9.+eE]+)\n+([-0-9.+eE]+)} [bopcurves h0_57 s1 -2d] full Toler NbCurv
+
+checkreal Tolerance $Toler 1.2073645369286468e-08 0.0 0.01
+
+if {$NbCurv != 2} {
+  puts "Error: Please check NbCurves for intersector"
+}
+
+#check whether the curves have a loop
+for { set ic 1 } { $ic <= $NbCurv } {incr ic} {
+  bounds c_$ic U1 U2
+  if {[dval U2-U1] < 1.0e-9} {
+    puts "Error: Wrong curve's range!"
+    continue
+  }
+  
+  CheckLoops c_$ic 0.86602540378443864676372317075294    
+}
+
+smallview
+don c_*
+fit
+disp h0_57 s1
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
\ No newline at end of file
diff --git a/tests/bugs/modalg_7/bug28544_2 b/tests/lowalgos/intss/bug28544_2
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