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ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
0026740 | Open CASCADE | [OCCT] OCCT:Modeling Algorithms | public | 2015-10-01 15:57 | 2019-09-04 12:11 | ||||||||
Reporter | nbv | ||||||||||||
Assigned To | msv | ||||||||||||
Priority | normal | Severity | minor | ||||||||||
Status | assigned | Resolution | open | ||||||||||
Platform | OS | OS Version | |||||||||||
Product Version | |||||||||||||
Target Version | [OCCT] Unscheduled | Fixed in Version | |||||||||||
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 | |||||||||||||
Attached Files | ![]() ![]() | ||||||||||||
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(0046377) nbv (developer) 2015-10-01 16:14 |
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). |
(0046385) nbv (developer) 2015-10-01 18:25 edited on: 2015-10-01 18:26 |
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. |
(0046387) nbv (developer) 2015-10-02 09:32 |
I have checked described situation on OCCT 6.7.0 and have obtained as same as result. |
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Date Modified | Username | Field | Change |
2015-10-01 15:57 | nbv | New Issue | |
2015-10-01 15:57 | nbv | Assigned To | => msv |
2015-10-01 15:57 | nbv | File Added: master_result.png | |
2015-10-01 15:57 | nbv | Assigned To | msv => nbv |
2015-10-01 15:58 | nbv | File Added: source_shape.PNG | |
2015-10-01 16:14 | nbv | Note Added: 0046377 | |
2015-10-01 16:16 | nbv | Relationship added | related to 0026675 |
2015-10-01 18:01 | msv | Status | new => assigned |
2015-10-01 18:25 | nbv | Note Added: 0046385 | |
2015-10-01 18:26 | nbv | Note Edited: 0046385 | View Revisions |
2015-10-02 09:32 | nbv | Note Added: 0046387 | |
2016-10-25 19:04 | msv | Target Version | 7.1.0 => 7.2.0 |
2017-06-15 11:06 | nbv | Relationship added | related to 0026907 |
2017-06-15 11:06 | nbv | Relationship deleted | related to 0026907 |
2017-06-15 11:06 | nbv | Relationship added | related to 0026655 |
2017-07-21 11:04 | msv | Target Version | 7.2.0 => 7.3.0 |
2017-12-05 17:09 | msv | Target Version | 7.3.0 => 7.4.0 |
2017-12-08 11:57 | nbv | Relationship added | related to 0029359 |
2018-03-05 10:52 | nbv | Relationship added | related to 0026907 |
2018-03-05 10:52 | nbv | Relationship added | related to 0028575 |
2019-08-12 19:08 | msv | Assigned To | nbv => msv |
2019-08-12 19:13 | msv | 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 |
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