Notes |
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(0029982)
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abv
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2014-07-07 12:13
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All the faces translate from STEP correctly. The problem is in meshing of face 11, now attached to the issue as separate file bug25045_face11.brep. BRepMesh reports "Self-intersecting wire" error, althoung the face is valid according to checkshape, and has rather small tolerance:
Draw[2]> rest d:/temp/bug25045_face11.brep a
a
Draw[3]> incmesh a 1
Incremental Mesh, multi-threading OFF
Meshing statuses: SelfIntersectingWire
Draw[4]> trinfo a
This shape contains 0 triangles.
0 nodes.
Maximal deflection 0
Draw[5]> checksh a
This shape seems to be valid
Draw[6]> toler a
Tolerance MAX=0.00053798328028226996 AVG=0.0002255237013194376 MIN=9.99999999999
99995e-008
FACE : MAX=9.9999999999999995e-008 AVG=9.9999999999999995e-008 MIN=9.99999999
99999995e-008
EDGE : MAX=0.00053730480348679094 AVG=0.000118593008751733 MIN=9.999999999999
9995e-008
VERTEX : MAX=0.00053798328028226996 AVG=0.00029777435604657639 MIN=9.9999999999
999995e-008
Draw[7]> boundings a
-5.2126900585274489 -2.6044476583634797 -1.0000018341558962e-007 4.7674093775600
284 5.2126900585274498 1.826735590329116 |
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(0029987)
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oan
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2014-07-07 15:57
(edited on: 2014-07-07 16:00) |
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The core of the problem is in method BRepMesh_FastDiscretFace::FindUV that uses large tolerance to identify coinciding points in 2D space. As a result, degenerative edge (in fact represented by a segment in 2D space) collapses to a single vertex during discretization procedure and causes wire with self intersection (see attached screenshot). Another anomaly related to this behavior is already reported in 0023111 issue.
In context of current issue it is proposed:
- take changes implemented in 0023106 as a base for current one;
- in BRepMesh_FastDiscret fill data structure and classifier tool using scaled dimensions as it is implemented in BRepMesh_FastDiscretFace::Add(face);
- fill data structure within BRepMesh_FastDiscretFace using scaled dimensions without further conversion to normal ones;
- convert dimensions from scaled to normal directly before storing of triangulation to the shape in BRepMesh_FastDiscret.
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(0050227)
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git
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2016-01-29 12:41
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Branch CR25045 has been created by oan.
SHA-1: 02edb2ef7f0e8423b2912efb45c0f375fc3b90b8
Detailed log of new commits:
Author: oan
Date: Fri Jan 29 12:41:02 2016 +0300
Added test case
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(0050228)
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oan
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2016-01-29 12:44
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Dear Bugmaster,
it seems that this case has became OK due to fixes for shape healing and mesh since 6.7.0.
Please verify. Test case has been added to branch CR25045. |
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(0050232)
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git
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2016-01-29 14:05
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Branch CR25045 has been deleted by oan.
SHA-1: 02edb2ef7f0e8423b2912efb45c0f375fc3b90b8 |
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(0050233)
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git
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2016-01-29 14:08
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Branch CR25045 has been created by oan.
SHA-1: 5f652d6d3fea978fad337a92d6a3b6a7d5c2975e
Detailed log of new commits:
Author: oan
Date: Fri Jan 29 14:08:31 2016 +0300
Added test case
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(0050951)
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git
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2016-02-18 14:56
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Branch CR25045 has been updated by apn.
SHA-1: 29d575d6cf14dbc894e6973538c5978ce8022908
Detailed log of new commits:
Author: apn
Date: Thu Feb 18 14:56:35 2016 +0300
Small corrections in test case
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(0050952)
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apn
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2016-02-18 14:57
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(0050953)
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git
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2016-02-18 15:00
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Branch CR25045 has been updated forcibly by apn.
SHA-1: e12d39ef1183c7d82c8a5dcbcf070fe1eb386c78 |
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(0051006)
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git
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2016-02-19 12:44
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Branch CR25045 has been updated forcibly by apn.
SHA-1: f720694056554cdd0b987a9e6b747bb94094ad63 |
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(0053080)
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git
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2016-04-17 14:14
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Branch CR25045 has been deleted by kgv.
SHA-1: f720694056554cdd0b987a9e6b747bb94094ad63 |
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