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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
| 0026816 | Open CASCADE | [OCCT] OCCT:Modeling Algorithms | public | 2015-10-27 11:55 | 2017-12-05 17:00 | ||||||||
| Reporter | nbv | ||||||||||||
| Assigned To | msv | ||||||||||||
| Priority | normal | Severity | minor | ||||||||||
| Status | new | Resolution | open | ||||||||||
| Platform | OS | OS Version | |||||||||||
| Product Version | |||||||||||||
| Target Version | [OCCT] 7.4.0* | Fixed in Version | |||||||||||
| Summary | 0026816: Boolean operation produces invalid shape in "bugs modalg_5 bug25838" test case | ||||||||||||
| Description | This bug has been detected while fixing bug 0026675 and is not reproduced on the current MASTER (before fixing bug 0026675). The main reason is incorrect processing near located edges. ------------------------------------------------------------------- Try the following script for reproducing: Draw[]> restore [locate_data_file bug25715_p02c3s1.brep] b1 Draw[]> restore [locate_data_file bug25838_p02c3s2.brep] b2 Draw[]> restore [locate_data_file bug25715_p02c3s3.brep] b3 Draw[]> bfuse b1 b1 b2 Draw[]> don b1 b3 Draw[]> explode b1 f Draw[]> explode b3 f Draw[]> donly b1_1 b1_9 b3_1 Draw[]> bopcurves b1_9 b3_1 -2d #c_1 (c2d1_1, c2d2_1): Tolerance Reached=9.9999999999999995e-008 (FIX) and 2.0504059305500661e-005 (MASTER) Draw[]> copy c_1 c91 Draw[]> bopcurves b1_1 b3_1 -2d #c_1...c_5: Tolerance Reached=3.3301015655500105e-007 (FIX) and 4.1550546180586178e-006 (MASTER) I.e. tolerance for FIX is 3.3301015655500105e-007 + 9.9999999999999995e-008 = 4.3301015655500105e-007. Tolerance for MASTER is: 2.0504059305500661e-005 + 4.1550546180586178e-006 = 2.4659113923559279e-005. Draw[]> mkedge ee c_3 Draw[]> donly c91 ee Draw[]> fit ## SCRIPT 1 (begin) for {set tpar 0.0} {$tpar <= 1.0} {set tpar [expr $tpar+0.1]} { cvalue c91 $tpar xx yy zz vertex vv xx yy zz distmini dd vv ee puts "$tpar : [dval dd_val]" } ## SCRIPT 1 (end) ## OUTPUT on FIX (begin) 0.0 : 1.5692362877956714e-006 0.1 : 1.5585313640849257e-006 0.2 : 1.5491703735376827e-006 0.30000000000000004 : 1.5420205615884738e-006 0.4 : 1.5343386892894957e-006 0.5 : 1.5247160288497738e-006 0.6 : 1.514314941239327e-006 0.7 : 1.5044067252372638e-006 0.7999999999999999 : 1.4953848034815263e-006 0.8999999999999999 : 1.4850157720097117e-006 0.9999999999999999 : 1.4714760274267883e-006 ## OUTPUT on FIX (end) I.e. the distances on FIX are greater than tolerance. Therefore, edges are not shared. However, these edges are shared on MASTER (for the same reason - distances are lower then tolerance because tolerance is greater). As result: Draw[]> bfuse result b1 b3 Draw[]> checkshape result #BRepCheck_IntersectingWires (on FIX) and OK (on MASTER). | ||||||||||||
| Steps To Reproduce | Test bugs modalg_5 bug25838 | ||||||||||||
| Tags | No tags attached. | ||||||||||||
| Test case number | bugs modalg_5 bug25838 | ||||||||||||
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(0048540) msv (developer) 2015-11-24 19:59 |
I have analyzed this case more deeply. The faces b1_1 and b1_9 from the script are built on parallel cylinders. Their axes have distance 1e-6 from each other. It leads to the fact that near the place of interest the surfaces have distance about 7e-7. It is greater than tolerances of shapes (1e-7). After intersection of these faces by the spherical surface the distance between intersection curves is about the same value 7e-7. However, in master version the reached tolerance is much greater (2e-5) and covers the distance. In fix version the intersection curves are computed more precise with the reached tolerance 3e-7, which does not cover the gap between curves. So, the fix works more precise. Taking into account the distance between original nearly-same-domain faces (1e-6), the Boolean operation can work in this case only with help of Fuzzy option. In master version this role was successfully played by roughly computed intersection. I propose to add fuzzy value 1e-6 in this test case to make it theoretically correct. |
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(0069394) mkv (tester) 2017-08-15 14:45 |
Problem described in issue is reproduced on current state of OCCT. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2015-10-27 11:55 | nbv | New Issue | |
| 2015-10-27 11:55 | nbv | Assigned To | => msv |
| 2015-10-27 12:07 | nbv | Relationship added | related to 0026675 |
| 2015-10-27 14:03 | nbv | Steps to Reproduce Updated | View Revisions |
| 2015-10-27 15:39 | nbv | Description Updated | View Revisions |
| 2015-10-27 15:39 | nbv | Steps to Reproduce Updated | View Revisions |
| 2015-10-28 17:31 | msv | Target Version | 7.0.0 => 7.1.0 |
| 2015-11-24 18:01 | nbv | Description Updated | View Revisions |
| 2015-11-24 19:59 | msv | Note Added: 0048540 | |
| 2015-11-25 19:18 | msv | Relationship added | related to 0025838 |
| 2016-10-28 17:03 | msv | Target Version | 7.1.0 => 7.2.0 |
| 2017-07-24 09:22 | msv | Target Version | 7.2.0 => 7.3.0 |
| 2017-08-15 14:45 | mkv | Test case number | => bugs modalg_5 bug25838 |
| 2017-08-15 14:45 | mkv | Note Added: 0069394 | |
| 2017-12-05 17:00 | msv | Target Version | 7.3.0 => 7.4.0* |
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Issue History |
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