View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0030466 | Community | OCCT:Modeling Algorithms | public | 2019-01-31 17:34 | 2019-02-01 10:15 |
| Reporter | emei | Assigned To | |||
| Priority | normal | Severity | minor | ||
| Status | new | Resolution | open | ||
| Platform | Windows | OS | VC++ 2015 | ||
| Product Version | 7.3.0 | ||||
| Summary | 0030466: Problems removing non-isolated holes | ||||
| Description | Noticed when working on CADProcessor: concerns BRepAlgoAPI_Defeaturing Problem when trying to remove a hole which is lying on more than 1 support face (the hole is at the intersection of multiple faces). The algorithm fails to remove the hole. | ||||
| Steps To Reproduce | restore 2019-01-15_Intrados-HolesRemoved.brep a explode a F removefeatures result a a_19 a_20 a_25 a_26 | ||||
| Additional information and documentation updates | From a preliminary study, the input looks OK (the feature faces and adjacent faces numbers are correct). But the solid is not recreated properly, from BOPAlgo_MakerVolume::PerformInternal1, after BuildSolids call, only the bounding box is recreated, which leaves us with no result shape at the end. | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
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2019-01-15_Intrados-HolesRemoved.brep (910,293 bytes) |
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The input shapes has a huge tolerance relatively the model size. Try the command 'tolsphere' in draw to see the tolerances of vertices:tolsphere a It is not safe to pass such arguments into the modeling operations. But even after reducing the tolerances of the shape with the following commands: settolerance a 1.e-7 fixshape a a the algorithms fails to remove the hole. It seems the reason is the huge tolerance obtained by the Face/Face intersection algorithm when intersecting the extended faces filling the hole. These tolerances do not allow producing the correct volume. Here is the script to see these intersection tolerances: restore bug30466_extfaces.brep c explode c f bopcurves c_2 c_3 -2d # Tolerance Reached=0.53837672555709137 |
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2019-02-01 10:15 developer |
bug30466_extfaces.brep (166,251 bytes) |
