View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0032968 | Community | OCCT:Data Exchange | public | 2022-05-11 20:48 | 2022-05-14 21:47 |
| Reporter | mr baley | Assigned To | bugmaster | ||
| Priority | normal | Severity | just a question | ||
| Status | closed | Resolution | no change required | ||
| Platform | Windows | OS | VC++ 2022 | ||
| Product Version | 7.6.0 | ||||
| Target Version | 7.7.0 | ||||
| Summary | 0032968: TopLoc_Location::IsEqual and BRep_CurveOnSurface::IsCurveOnSurface seem to not match with each other | ||||
| Description | I'm trying to use BRep_Tool::CurveOnSurface to retrieve a Handle(Geom2d_Curve). I'm working with a step model i imported using STEPControl_Reader. The model is correctly displayed. I also checked the TopoDS_Edge and the TopoDS_Face i'm passing to BRep_Tool::CurveOnSurface with BRepCheck_Analyzer and it returns IsValid() == true for both. When debugging i can see that the BRep_TEdge contains four BRep_CurveRepresentation, a BRep_Curve3D, two BRep_CurveOnSurface and a BRep_CurveOn2Surfaces. BRep_Tool::CurveOnSurface iterates through all BRep_CurveRepresentation of the TopoDS_Edge and calls BRep_CurveOnSurface::IsCurveOnSurface for each BRep_CurveRepresentation. BRep_CurveOnSurface::IsCurveOnSurface compares the surfaces by pointers and the TopLoc_Locations using this Equal implementation which, and this is the reason why in this case BRep_Tool::CurveOnSurface returns a null Handle, returns false if one returns true for IsIdentity(). I honestly don't know what's the reasoning behind this implementation. I was thinking that maybe transformations are not supposed to be empty (because that's what TopLoc_Location::IsIdentity() checks) but STEPControl_Reader doesn't report any errors and BRepCheck_Analyzer says everything is valid. I might be able to work around this by looping through all curves myself and replacing empty location with actual identity transformations but it feels wrong. What am i missing? | ||||
| Steps To Reproduce | Iterate through all edges, take the first face of each, and try BRep_Tool::CurveOnSurface | ||||
| Additional information and documentation updates | I'm unsure what's the better place; i also posted this here: https://dev.opencascade.org/content/toploclocationisequal-and-brepcurveonsurfaceiscurveonsurface-seem-not-match-each-other | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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Question answered here: https://dev.opencascade.org/content/toploclocationisequal-and-brepcurveonsurfaceiscurveonsurface-seem-not-match-each-other Sorry for the double post. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2022-05-11 20:48 | mr baley | New Issue | |
| 2022-05-11 20:48 | mr baley | Assigned To | => msv |
| 2022-05-11 20:48 | mr baley | File Added: problem.stp_.7z | |
| 2022-05-11 21:00 | mr baley | File Deleted: problem.stp_.7z | |
| 2022-05-11 21:01 | kgv | Category | OCCT:Modeling Data => OCCT:Data Exchange |
| 2022-05-11 21:01 | kgv | Product Version | 7.7.0 => 7.6.0 |
| 2022-05-12 14:00 | mr baley | Assigned To | msv => gka |
| 2022-05-12 14:00 | mr baley | Status | new => resolved |
| 2022-05-12 14:00 | mr baley | Note Added: 0108411 | |
| 2022-05-12 15:59 | kgv | Assigned To | gka => bugmaster |
| 2022-05-12 15:59 | kgv | Status | resolved => feedback |
| 2022-05-14 21:47 |
|
Status | feedback => closed |
| 2022-05-14 21:47 |
|
Resolution | open => no change required |
