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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0028746||Community||[OCCT] OCCT:Modeling Algorithms||public||2017-05-17 14:04||2017-05-19 17:03|
|Platform||Windows||OS||VC++ 2015||OS Version||64 bit|
|Target Version||Fixed in Version|
|Summary||0028746: Stack overflow on NCollection_UBTree::Select|
When performing a boolean operation with operands of ~ 15000 faces [at least on Windows with default stack size] the stack overflows due to the recursive nature of NCollection_UBTree::Select(). I can happily create a test case, but it is a fairly general problem that I think we can discuss without. What is your point of view on this, should users simply take care of allocating a stack large enough for their operations to complete, is it a possibility to rewrite NCollection_UBTree::Select() without recursion, are these kind of operations better performed on a lighter mesh-based geometry kernel? Curious to hear your thoughts.
|Tags||No tags attached.|
|Test case number|
|Attached Files||shapes.7z (3,276,187 bytes) 2017-05-19 08:24|
You are first to report stack overflow issue on UBTree::Select for decades.
Implementation of the method Select is pretty simple due to its recursive nature. Then it was decided not to make more complex implementation.
Well, as it occurred, it should be solved. But anyway we need to create non-regression test. For that, please attach all necessary data to reproduce it.
Many thanks for your reply.
The following script will crash DRAW:
restore a.brep a
restore b.brep b
bcut ab1 a b
Interestingly, using `cut` instead of `bcut` does seem to work. Is there an overview somewhere of how the DRAW commands relate to C++?
Also note that it is not simply a matter of number of faces. My first attempt was to reproduce using arbitrarily generated solids, but didn't encounter issues. Perhaps there is something in this input files that makes the tree particularly unbalanced? Just guessing.
Thomas, thank you for the shapes.
a.b.brep actually is a zip-file. It has been repacked to shapes.7z.
However, I could not reproduce the problem. The algorithm completes with no error.
Please tell the following info:
- What version of OCCT do you use?
- What compiler do you use and what version? E.g., MSVC 2013.
- How did you built OCCT? Did you use pre-built binaries in package? Or built using cmake, or genproj.bat?
- Which customization you did in standard compile settings?
- Is the issue reproduced in debug build?
As for your questions, 'cut' runs old deprecated Boolean algorithm, 'bcut' uses the current actual algorithm. To get file name of the source code of the draw command, use the command 'getsourcefile'. It is all described in the Draw developer user guide (https://dev.opencascade.org/doc/overview/html/occt_dev_guides__tests.html#testmanual_3_3 [^]).
UBTree by default is unbalanced. In order to get it quasi-balanced, a special randomization procedure is used (NCollection_UBTreeFiller).
Hi msv, many thanks for checking.
> a.b.brep actually is a zip-file. It has been repacked to shapes.7z.
Had to compress the files to comply with the max file size here on mantis. Not sure what happened with the file extension though, sorry for the confusion.
> However, I could not reproduce the problem. The algorithm completes with no error.
That is odd, I have tried DRAW from the prebuilt packages for vc10 6.9.1 7.0.0 7.1.0. All with this problem. In my own vc14 6.9.1 environment I encounter the issue in both debug and release builds.
How to proceed? I don't think on Windows there are environment settings that influence behaviour of the stack (contrary to nix). Also note that this issue has been reported by one of my users , so at least one other person is able to reproduce this issue.
 https://github.com/IfcOpenShell/IfcOpenShell/issues/213 [^]
> - What version of OCCT do you use?
6.9.1 7.0.0 7.1.0
> - What compiler do you use and what version? E.g., MSVC 2013.
MSVC 2010 (prebuilt) and MSVC 2015
> - How did you built OCCT? Did you use pre-built binaries in package? Or built using
cmake, or genproj.bat?
pre-built binaries and CMake
> - Which customization you did in standard compile settings?
> - Is the issue reproduced in debug build?
> It is all described in the Draw developer user guide
|What is OS version on your computer and on computer of your user? Is OCCT build 32 or 64 bit?|
|I have reproduced with current OCCT version built in 32-bit mode. 64-bit build has no such issue.|
|The best solution is to switch from NCollection_UBTree to BVH tree. The last is much more effective and contains no such issues.|
|This issue will be postponed till available resources are present.|
|2017-05-17 14:04||aothms||New Issue|
|2017-05-17 14:04||aothms||Assigned To||=> msv|
|2017-05-18 09:50||msv||Note Added: 0066236|
|2017-05-18 09:50||msv||Assigned To||msv => aothms|
|2017-05-18 09:50||msv||Status||new => feedback|
|2017-05-18 18:40||aothms||File Added: a.b.brep|
|2017-05-18 18:45||aothms||Note Added: 0066296|
|2017-05-19 08:24||emv||File Added: shapes.7z|
|2017-05-19 09:05||msv||File Deleted: a.b.brep|
|2017-05-19 09:19||msv||Note Added: 0066298|
|2017-05-19 15:47||aothms||Note Added: 0066330|
|2017-05-19 16:27||msv||Note Added: 0066335|
|2017-05-19 16:39||msv||Note Added: 0066337|
|2017-05-19 17:02||msv||Note Added: 0066340|
|2017-05-19 17:03||msv||Note Added: 0066341|
|2017-05-19 17:03||msv||Assigned To||aothms => msv|
|2017-05-19 17:03||msv||Status||feedback => assigned|
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