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ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
0026935 | Community | [OCCT] OCCT:Modeling Algorithms | public | 2015-11-29 18:36 | 2016-03-15 09:33 | ||||||||
Reporter | Vico Liang | ||||||||||||
Assigned To | msv | ||||||||||||
Priority | low | Severity | feature | ||||||||||
Status | assigned | Resolution | open | ||||||||||
Platform | OS | OS Version | |||||||||||
Product Version | |||||||||||||
Target Version | [OCCT] Unscheduled | Fixed in Version | |||||||||||
Summary | 0026935: Implement Thicken Sheet in OCCT | ||||||||||||
Description | Other modeling engines, such as ACIS and Parasolid, have the functions to thicken a sheet with a specified thickness. It's very useful feature to construct solids from sheet. I know that there are functions to offset faces in OCCT, it would be nice to make solid from the offset faces. | ||||||||||||
Tags | No tags attached. | ||||||||||||
Test case number | |||||||||||||
Attached Files | ![]() ![]() | ||||||||||||
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(0048648) msv (developer) 2015-11-30 12:32 |
In order to implement such feature it is needed first to specify how it will be done. OK, we have functionality that makes offset shell of a shell. But in order to make solid we need to define how to construct the surfaces between original faces and their offsets. Without well-defined specification the development of a new feature is not possible. |
(0050383) alainb (reporter) 2016-02-03 16:18 edited on: 2016-02-03 16:20 |
I very much agree with original poster that "Other modeling engines, such as ACIS and Parasolid, have the functions to thicken a sheet with a specified thickness. It's very useful feature to construct solids from sheet.". It is a feature that is missing from OCC. You may be interested in this thread : http://forum.freecadweb.org/viewtopic.php?f=9&t=3248 [^] As for the specification although not expressely stated by original poster, I think that most users would resquest that thickening be done normal to the surface at any point. |
(0050656) Vico Liang (developer) 2016-02-12 05:43 |
Dear msv, Yes, I agree that it need well-defined specification to construct the surface between original faces and their offsets. I suppose the surface can be ruled-surface to connect the original faces and their offsets. Does OCCT have schedule to implement such feature? I'm sure this modeling feature will be a big hilight of OCCT. |
(0050657) Vico Liang (developer) 2016-02-12 05:51 |
Salome stated that it implements its own offset feature in latest release base on OCCT6.9.1. Why not consider to make it in OCCT? |
(0050842) msv (developer) 2016-02-16 18:31 |
I consulted with SALOME experts, and this is the answer: In fact, SALOME does not implement any specific algorithm of thickening, it just uses OCCT functionality, namely: • Create thick solid from face or shell: FACE or SHELL -> SOLID BRepOffset_MakeOffset myOffsetShape(aShapeBase, anOffset, aTol, BRepOffset_Skin, Standard_False, Standard_False, GeomAbs_Intersection, Standard_True); • Create hollowed solid (by pointing faces on which material is removed): SOLID -> SOLID BRepOffsetAPI_MakeThickSolid aMkSolid(aShapeBase, aFacesToRm, anOffset, aTol, BRepOffset_Skin, Standard_False, Standard_False, GeomAbs_Intersection); I am sorry that I was unaware of such feature (it is impossible to know everything by one person :) ). Indeed, this is available by the Draw command thickshell: Draw[16]> help thickshell thickshell : thickshell r shape offset [jointype [tol] ] I have attached the snapshots of original shell and result thick solid: thickshell res shell 0.2 i |
(0051494) Vico Liang (developer) 2016-03-10 04:49 |
Dear msv, Sorry for later responsing. I checked the class BRepOffset_MakeOffset. It implemented the thicken feature as your described. But there is no entry in public API to use this feature(BRepOffset_MakeOffset is not a public entrance i think). So why not make the thickness parameter avalible in class BRepOffsetAPI_MakeThickSolid? OCCT have such wonderful feature, why not let outside world know? |
(0051598) msv (developer) 2016-03-14 15:17 |
Dear Vico, Though BRepOffset_MakeOffset is not present in User Guide it is still a public API. It presents in the reference manual (http://www.opencascade.com/doc/occt-6.9.1/refman/html/class_b_rep_offset___make_offset.html [^]). Of course, it would be nice to make an entry for this functionality in BRepOffsetAPI_MakeThickSolid, and properly update documentation. If you have time and willing to make such contribution you are very welcome. |
(0051608) Vico Liang (developer) 2016-03-15 06:32 |
Dear msv, Yes, BRepOffset_MakeOffset is accesible for public user. It would be better to make such change in OCCT internal team. The priority should be low. |
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Date Modified | Username | Field | Change |
2015-11-29 18:36 | Vico Liang | New Issue | |
2015-11-29 18:36 | Vico Liang | Assigned To | => msv |
2015-11-30 12:32 | msv | Note Added: 0048648 | |
2015-11-30 12:32 | msv | Target Version | 7.0.0 => Unscheduled |
2016-02-03 16:18 | alainb | Note Added: 0050383 | |
2016-02-03 16:19 | alainb | Note Edited: 0050383 | View Revisions |
2016-02-03 16:19 | alainb | Note Edited: 0050383 | View Revisions |
2016-02-03 16:20 | alainb | Note Edited: 0050383 | View Revisions |
2016-02-12 05:43 | Vico Liang | Note Added: 0050656 | |
2016-02-12 05:51 | Vico Liang | Note Added: 0050657 | |
2016-02-16 18:31 | msv | Note Added: 0050842 | |
2016-02-16 18:32 | msv | File Added: shell.PNG | |
2016-02-16 18:32 | msv | File Added: thicksolid.PNG | |
2016-02-16 18:32 | msv | Assigned To | msv => Vico Liang |
2016-02-16 18:32 | msv | Status | new => feedback |
2016-03-10 04:49 | Vico Liang | Note Added: 0051494 | |
2016-03-10 04:50 | Vico Liang | Assigned To | Vico Liang => msv |
2016-03-10 04:50 | Vico Liang | Status | feedback => assigned |
2016-03-14 15:17 | msv | Note Added: 0051598 | |
2016-03-14 15:17 | msv | Assigned To | msv => Vico Liang |
2016-03-14 15:17 | msv | Status | assigned => feedback |
2016-03-15 06:32 | Vico Liang | Note Added: 0051608 | |
2016-03-15 06:32 | Vico Liang | Assigned To | Vico Liang => msv |
2016-03-15 06:33 | Vico Liang | Status | feedback => assigned |
2016-03-15 09:33 | msv | Priority | normal => low |
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