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IDProjectCategoryView StatusDate SubmittedLast Update
0031259CommunityOCCT:Modeling Algorithmspublic2019-12-22 17:342021-03-30 11:44
Reporterblobfish Assigned Tomsv 
PrioritynormalSeverityminor 
Status newResolutionopen 
Platformamd64OSlinux debian 
Product Version5.2.2 
Summary0031259: Modeling Algorithms - basic shape offset smashes tolerances
Descriptionusing offset shape in draw on a simple box, smashes tolerances on both the offset result and the input shape.
Steps To Reproduce
pload MODELING
box aBox 20 10 6
explode aBox f
maxtolerance aBox
offsetshape result aBox 1.0 aBox_1
maxtolerance aBox
maxtolerance result
Additional information
and documentation updates		#results from above script:
Draw[1]> Draw[2]> pload MODELING
Draw[3]> box aBox 20 10 6
Draw[4]> explode aBox f
aBox_1 aBox_2 aBox_3 aBox_4 aBox_5 aBox_6
Draw[5]> maxtolerance aBox

## Tolerances on the shape aBox  (nbFaces:6  nbEdges:12 nbVtx:8)

    Face   : Min 1.00000e-07    Max  1.00000e-07 
 
    Edge   : Min 1.00000e-07    Max  1.00000e-07 
 
    Vertex : Min 1.00000e-07    Max  1.00000e-07 
 
Draw[6]> offsetshape result aBox 1.0 aBox_1
OK. Offset performed succesfully.
Draw[7]> maxtolerance aBox

## Tolerances on the shape aBox  (nbFaces:6  nbEdges:12 nbVtx:8)

    Face   : Min 1.00000e-07    Max  1.00000e-07 
 
    Edge   : Min 1.00000e-07    Max  1.00000e-03 
 
    Vertex : Min 1.00000e-07    Max  1.00000e-03 
 
Draw[8]> maxtolerance result

## Tolerances on the shape result  (nbFaces:23  nbEdges:48 nbVtx:28)

    Face   : Min 1.00000e-07    Max  1.00000e-07 
 
    Edge   : Min 1.00000e-07    Max  1.00000e-03 
 
    Vertex : Min 1.00000e-07    Max  1.00000e-03 
 
Draw[9]>

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Test case number

Attached Files

Activities

blobfish

2021-03-30 03:28

reporter  

offsetBacktrace.txt (824 bytes)   

blobfish

2021-03-30 03:32

reporter   ~0099836

traced to BRepAlgo_Loop.cxx:677-692, where tolerances are blindly set to 0.001

Standard_Real Tol = 0.001; //5.e-05; //5.e-07;
    TopExp_Explorer explo( NW, TopAbs_VERTEX );
    for (; explo.More(); explo.Next())
      {
      const TopoDS_Vertex& aV = TopoDS::Vertex( explo.Current() );
      Handle(BRep_TVertex)& TV = *((Handle(BRep_TVertex)*) &(aV).TShape());
      TV->Tolerance( Tol );
      TV->Modified( Standard_True );
      }
    for (explo.Init( NW, TopAbs_EDGE ); explo.More(); explo.Next())
      {
      const TopoDS_Edge& aE = TopoDS::Edge( explo.Current() );
      Handle(BRep_TEdge)& TE = *((Handle(BRep_TEdge)*) &(aE).TShape());
      TE->Tolerance( Tol );
      TE->Modified( Standard_True );
      }

Issue History

Date Modified Username Field Change
2019-12-22 17:34 blobfish New Issue
2019-12-22 17:34 blobfish Assigned To => msv
2020-01-27 10:13 kgv Summary basic shape offset smashes tolerances => Modeling Algorithms - basic shape offset smashes tolerances
2020-01-27 10:13 kgv Steps to Reproduce Updated
2020-01-27 10:13 kgv Additional Information Updated
2021-03-30 03:28 blobfish File Added: offsetBacktrace.txt
2021-03-30 03:32 blobfish Note Added: 0099836
2021-03-30 11:44 kgv Product Version => 5.2.2