View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0026740 | Open CASCADE | OCCT:Modeling Algorithms | public | 2015-10-01 15:57 | 2019-09-04 12:11 |
| Reporter | Assigned To | ||||
| Priority | normal | Severity | minor | ||
| Status | assigned | Resolution | open | ||
| Target Version | Unscheduled | ||||
| Summary | 0026740: Modeling Algorithms - Incorrect result of blend operation in "blend simple X4" test case | ||||
| Description | Theoretically, curve l must tangent line AB in point C (see master_result.png attached picture). Therefore, it is necessary for resulting shape to have a vertex in point C in order to be valid. This vertex is absence. More over, if we insert this vertex in the place C then the part of the current result from A to C must be absence (i.e. the filet must be made for red highlighted edge in source_shape.png file only). | ||||
| Steps To Reproduce | test blend simple X4 | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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| related to | 0026675 | closed | bugmaster | Open CASCADE | Eliminate normalization of coordinates in ApproxInt package |
| related to | 0026907 | assigned | Open CASCADE | ChFi3d_Builder algorithm uses old Boolean operations: wrong processing of shapes with seam and degenerated edges | |
| related to | 0028575 | assigned | Open CASCADE | Removal of the old Boolean Operations algorithm - BRepAlgo_BooleanOperation | |
| related to | 0026655 | new | Open CASCADE | ChFi3d_Builder algorithm fails to build fillets if some input edges connect with seam edges |
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2015-10-01 15:57 developer |
master_result.png (17,059 bytes) |
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2015-10-01 15:58 developer |
source_shape.PNG (31,930 bytes) |
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A few words about validity the result in terms of BRepCheck algorithm. Draw[]> explode result f Draw[]> explode result_3 e Draw[]> xdistef result_3_5 result_3 #Max distance = 0.0025028007416767954 Edge rr_3_5 is not valid in terms of same-parameter (it is valid in terms of BRepCheck algorithm because it has big tolerance). I.e. its 2D- and 3D-curve are not matched each other. As result, 2D-curve of result_3_5 does not tangent rr_3_2 edge (despite it must do it). Consequently, the validity of the result is pure chance. I tried to make more precise filet-edge with change some parameters of IntWalk_PWalking algorithm (function ChFi3d_ComputeCurves(...), line "IntWalk_PWalking IntKK(S1,S2,tol3d,tol3d,fleche,Step)"). As result, I obtained an edge with maximal distance between 2D- and 3D-curve approximately 1.0e-13. After that, BRepCheck algorithm returns "BRepCheck_SelfIntersectingWire". The main reason is the vertex is absence (see bug description). |
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Other remarks. 1. Firstly, the intersection edge (result_3_5 in previous message) is found as result of GeomInt_IntSS algorithm between two cylinders. It returns two intersection line, which are connected in point C. However, ChFi3d_Builder does not apply it to make fillet. Therefore, it rebuilds intersection line with IntWalk_PWalking algorithm and obtains single line as result. 2. If we insert this vertex in the place C then we will obtain filleted face between C and B only (see master_result.png and bug description). For obtaining result shown in the picture master_result.png we should add another edge to the arguments of "blend" DRAW-command. On the current MASTER this operation leads to exception. |
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I have checked described situation on OCCT 6.7.0 and have obtained as same as result. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2015-10-01 15:57 |
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New Issue | |
| 2015-10-01 15:57 |
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Assigned To | => msv |
| 2015-10-01 15:57 |
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File Added: master_result.png | |
| 2015-10-01 15:57 |
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Assigned To | msv => nbv |
| 2015-10-01 15:58 |
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File Added: source_shape.PNG | |
| 2015-10-01 16:14 |
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Note Added: 0046377 | |
| 2015-10-01 16:16 |
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Relationship added | related to 0026675 |
| 2015-10-01 18:01 |
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Status | new => assigned |
| 2015-10-01 18:25 |
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Note Added: 0046385 | |
| 2015-10-01 18:26 |
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Note Edited: 0046385 | |
| 2015-10-02 09:32 |
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Note Added: 0046387 | |
| 2016-10-25 19:04 |
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Target Version | 7.1.0 => 7.2.0 |
| 2017-06-15 11:06 |
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Relationship added | related to 0026907 |
| 2017-06-15 11:06 |
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Relationship deleted | related to 0026907 |
| 2017-06-15 11:06 |
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Relationship added | related to 0026655 |
| 2017-07-21 11:04 |
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Target Version | 7.2.0 => 7.3.0 |
| 2017-12-05 17:09 |
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Target Version | 7.3.0 => 7.4.0 |
| 2018-03-05 10:52 |
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Relationship added | related to 0026907 |
| 2018-03-05 10:52 |
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Relationship added | related to 0028575 |
| 2019-08-12 19:08 |
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Assigned To | nbv => msv |
| 2019-08-12 19:13 |
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Target Version | 7.4.0 => Unscheduled |
| 2019-09-04 12:11 | kgv | Summary | Incorrect result of blend operation in "blend simple X4" test case => Modeling Algorithms - Incorrect result of blend operation in "blend simple X4" test case |