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IDProjectCategoryView StatusDate SubmittedLast Update
0023933CommunityOCCT:Modeling Algorithmspublic2013-04-25 02:412013-12-19 13:55
ReporterAaron Michalk Assigned Toemv 
PrioritynormalSeveritymajor 
Status closedResolutionfixed 
PlatformWindowsOSVC++ 2010 
Product Version6.6.0 
Target Version6.7.0Fixed in Version6.7.0 
Summary0023933: Self intersection reported after Fuse operation
DescriptionAfter performing a BRepAlgoAPI_Fuse, BRepAlgoAPI_Check fails with BOPAlgo_SelfIntersect.
Steps To ReproduceBRep_Builder builder;
TopoDS_Shape a, b;
BRepTools::Read(a, std::ifstream("a.brep", builder);
BRepTools::Read(b, std::ifstream("b.brep", builder);
TopoDS_Shape c = BRepAlgoAPI_Fuse(a, b);
assert(BRepAlgoAPI_Check(c).IsValid());
TagsNo tags attached.
Test case numberbugs modalg_5(010) bug23933

Attached Files

  • ab.zip (24,357 bytes)

Activities

Aaron Michalk

2013-04-25 02:41

reporter  

ab.zip (24,357 bytes)

abv

2013-04-25 10:16

manager   ~0024266

I could not reproduce this in DRAW with official distribution of OCCT 6.6.0 on my system (Windows 7 64-bit). The commands are:

restore a.brep
restore b.brep
bfuse r a b
checkshape r

Note that files a.brep and b.brep need to be modified for DRAW to be able to read them (add first line containing "DBRep_DrawableShape").
The result looks Ok.

Please check if this is reproducible in DRAW on your system, and indicate your platform (OS, compiler, used build method).

abv

2013-04-25 10:20

manager   ~0024267

Oops, sorry, the system has been properly indicated, please ignore my request for it. Just please check if the problem can be reproduced with the DRAW commands above.

abv

2013-04-25 12:23

manager   ~0024270

I have checked with VS 2010 (10.0.40219.1 SP 1 Rel), Debug mode: the problem is not reproduced in DRAW

Aaron Michalk

2013-04-26 03:32

reporter   ~0024284

checkshape reports that "This shape seems to be valid." However, checkshape only calls BRepCheck_Analyzer. It does not call BRepAlgoAPI_Check where the problem is.

abv

2013-04-26 07:05

manager   ~0024285

Sorry I did not recognize the problem is not in BRepCheck but in BOP validity.

The script to reproduce a problem in DRAW:

restore a.brep
restore b.brep
checkshape a
checkshape b
bopargcheck a b -F #F
bfuse r a b
checkshape r
bopargcheck r #F

In OCCT 6.6.0, the last bopargcheck reports self-intersection on one face.
In OCCT 6.5.4 and 6.5.5, first bopargcheck reports 38 faulties, and second 4.

emv

2013-05-15 11:39

developer   ~0024390

The result of fuse operation is a valid shape. So the problem was in the checker for self intersection. I have fixed the problem. The draw commands bopcheck and bopargcheck report OK now for the result.
Please review the Git branch CR23933.

abv

2013-05-16 13:31

manager   ~0024416

Could you provide some explanation to this change? As I can guess from the code, it applies only for (aTypeInt == 4), i.e. likely edge-face intersection, and skips if intersection is shape. Does this mean that no intersection exists? Should not this be applied to other cases?

emv

2013-05-17 12:56

developer   ~0024427

Yes, it means that there is no intersection exists and this should not be applied to the other cases.
I have added the additional check for the case like that (edge lies on the surface of the face, but not on the face itself) in IntTools_BeanFaceIntersector::FastComputeExactIntersection() to prevent creating an Edge/Face intersection. So, please review the Git branch CR23933 once more.

mkv

2013-05-21 10:06

tester   ~0024445

Last edited: 2013-05-21 10:06

 Dear BugMaster,

Branch CR23933 (and products from GIT master) was compiled on Linux and Windows platforms and tested.
SHA-1: 6aded94450a81ea0b7caddc6c682e692eafa74ba

Number of compiler warnings:

occt component :
Linux: 2 (2 on master)
Windows: 11 (11 on master)

products component :
Linux: 0 (0 on master)
Windows: 64 (64 on master)

Regressions:
No regressions

Improvements:
No improvements

Testing cases:
bugs modalg_5(010) bug23933 - OK

Testing on Linux:
Total MEMORY difference: 366022500 / 365872296
Total CPU difference: 42718.340000001 / 45787.80000000135

Testing on Windows:
Total MEMORY difference: 415905576 / 418425896
Total CPU difference: 35951.6875 / 30650.765625

There are not differences in images found by testdiff.

Related Changesets

occt: master f1419025

2013-05-23 07:55:08

emv

Details Diff		 0023933: Self intersection reported after Fuse operation.

Additional check has been added in IntTools_BeanFaceIntersector::FastComputeExactIntersection() to prevent
creating an Edge/Face intersection for the case when edge lies on the surface of the face, but not on the face itself.
Adding test case for this fix		 Affected Issues
0023933
mod - src/BOPAlgo/BOPAlgo_ArgumentAnalyzer.cxx Diff File
mod - src/BOPTest/BOPTest_CheckCommands.cxx Diff File
mod - src/IntTools/IntTools_BeanFaceIntersector.cxx Diff File
add - tests/bugs/modalg_5/bug23933 Diff File

Issue History

Date Modified Username Field Change
2013-04-25 02:41 Aaron Michalk New Issue
2013-04-25 02:41 Aaron Michalk Assigned To => jgv
2013-04-25 02:41 Aaron Michalk File Added: ab.zip
2013-04-25 10:16 abv Note Added: 0024266
2013-04-25 10:16 abv Assigned To jgv => Aaron Michalk
2013-04-25 10:16 abv Status new => feedback
2013-04-25 10:20 abv Note Added: 0024267
2013-04-25 12:23 abv Note Added: 0024270
2013-04-26 03:32 Aaron Michalk Note Added: 0024284
2013-04-26 07:05 abv Note Added: 0024285
2013-04-26 07:05 abv Assigned To Aaron Michalk => emv
2013-04-26 07:05 abv Status feedback => acknowledged
2013-05-15 11:39 emv Note Added: 0024390
2013-05-15 11:39 emv Assigned To emv => abv
2013-05-15 11:39 emv Status acknowledged => resolved
2013-05-16 10:13 emv Assigned To abv => emv
2013-05-16 10:13 emv Status resolved => assigned
2013-05-16 11:40 emv Assigned To emv => abv
2013-05-16 11:40 emv Status assigned => resolved
2013-05-16 13:31 abv Note Added: 0024416
2013-05-17 12:56 emv Note Added: 0024427
2013-05-17 13:14 abv Assigned To abv => bugmaster
2013-05-17 13:14 abv Status resolved => reviewed
2013-05-17 14:15 mkv Assigned To bugmaster => mkv
2013-05-21 10:06 mkv Note Added: 0024445
2013-05-21 10:06 mkv Note Edited: 0024445
2013-05-21 10:07 mkv Test case number => bugs modalg_5(010) bug23933
2013-05-21 10:07 mkv Assigned To mkv => bugmaster
2013-05-21 10:07 mkv Status reviewed => tested
2013-05-23 12:12 bugmaster Target Version => 6.7.0
2013-05-24 13:06 emv Changeset attached => occt master f1419025
2013-05-24 13:06 emv Assigned To bugmaster => emv
2013-05-24 13:06 emv Status tested => verified
2013-05-24 13:06 emv Resolution open => fixed
2013-12-19 13:53 bugmaster Status verified => closed
2013-12-19 13:55 bugmaster Fixed in Version => 6.7.0