0030394: Modeling Algorithms - Empty result of offset operation (mode "Complete", join type - "Intersection")

The following changes have been made for improving the offset algorithm:
1. Multi-connexity support - intersection of the faces connected to the edge belonging to more than two faces is now performed.
2. Avoid intersection of the faces connected through internal edge.
3. Filling gaps (holes) in the splits of the created offset faces to increase possibility of creation of the closed volume from these splits.

Test cases for the issue.

src/BRepOffset/BRepOffset_Inter2d.cxx

@@ -1474,6 +1474,9 @@ void BRepOffset_Inter2d::ConnexIntByInt
     if (YaBuild) {
       for (itL.Initialize(L); itL.More(); itL.Next()) {
         const TopoDS_Edge& EI = TopoDS::Edge(itL.Value());
+        if (EI.Orientation() != TopAbs_FORWARD &&
+            EI.Orientation() != TopAbs_REVERSED)
+          continue;
         TopoDS_Shape aLocalShape = OFI.Generated(EI);
         const TopoDS_Edge& OE = TopoDS::Edge(aLocalShape);
         if (!MES.IsBound(OE) && !Build.IsBound(EI)) {

src/BRepOffset/BRepOffset_Inter3d.cxx

@@ -447,6 +447,11 @@ void BRepOffset_Inter3d::ConnexIntByInt
         TopExp_Explorer aExp(aFV1, TopAbs_EDGE);
         for (; aExp.More(); aExp.Next()) {
           const TopoDS_Shape& aE = aExp.Current();
+          if (aE.Orientation() != TopAbs_FORWARD &&
+              aE.Orientation() != TopAbs_REVERSED)
+            // Face is connected to the vertex through internal edge
+            break;
+
           TopoDS_Iterator aItV(aE);
           for (; aItV.More(); aItV.Next()) {
             if (aS.IsSame(aItV.Value())) {
@@ -455,7 +460,9 @@ void BRepOffset_Inter3d::ConnexIntByInt
             }
           }
         }
-        //
+        if (aExp.More())
+          continue;
+
         // get to the next face in the list
         it1 = it;
         for (it1.Next(); it1.More(); it1.Next()) {
@@ -464,7 +471,10 @@ void BRepOffset_Inter3d::ConnexIntByInt
           aExp.Init(aFV2, TopAbs_EDGE);
           for (; aExp.More(); aExp.Next()) {
             const TopoDS_Shape& aEV2 = aExp.Current();
-            if (aME.Contains(aEV2)) {
+            if (aME.Contains(aEV2) && 
+               (Analyse.Ancestors(aEV2).Extent() == 2 || // Multi-connexity is not supported in Analyzer
+               (aEV2.Orientation() != TopAbs_FORWARD &&  // Avoid intersection of faces connected by internal edge
+                aEV2.Orientation() != TopAbs_REVERSED))) { 
               break;
             }
           }

src/BRepOffset/BRepOffset_MakeOffset_1.cxx

@@ -55,6 +55,7 @@
 #include <TopTools_ListOfShape.hxx>
 #include <TopTools_DataMapOfShapeShape.hxx>
 #include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
+#include <TopTools_MapOfOrientedShape.hxx>
 
 #include <BOPTools_AlgoTools3D.hxx>
 #include <BOPTools_AlgoTools.hxx>
@@ -186,6 +187,7 @@ static
                                 const TopTools_ListOfShape& theLFImages,
                                 const TopTools_MapOfShape& theInvertedEdges,
                                 const TopTools_DataMapOfShapeListOfShape& theDMEOrLEIm,
+                                const TopTools_IndexedDataMapOfShapeListOfShape& theEFMap,
                                 TopTools_MapOfShape& theMFHoles,
                                 TopTools_DataMapOfShapeListOfShape& theDMFNewHoles,
                                 Handle(IntTools_Context)& theContext);
@@ -548,6 +550,9 @@ static
                                   TopTools_MapOfShape& theModifiedEdges,
                                   Handle(BRepAlgo_AsDes)& theAsDes);
 
+static
+  void FillGaps(TopTools_IndexedDataMapOfShapeListOfShape& theFImages);
+
 static
   void FillHistory(const TopTools_IndexedDataMapOfShapeListOfShape& theFImages,
                    const TopTools_DataMapOfShapeListOfShape& theEImages,
@@ -700,6 +705,11 @@ void BRepOffset_MakeOffset::BuildSplitsOfExtendedFaces(const TopTools_ListOfShap
                    anInvFaces, anArtInvFaces, aVAEmpty, theETrimEInf, theAsDes);
     }
   }
+
+  // Fill possible gaps in the splits of offset faces to increase possibility of
+  // creating closed volume from these splits
+  FillGaps(aFImages);
+
   // Fill history for faces and edges
   FillHistory(aFImages, anOEImages, theImage);
 }
@@ -977,7 +987,19 @@ void BuildSplitsOfFaces(const TopTools_ListOfShape& theLF,
     BRep_Builder().Add(aCEInverted, aItM.Value());
   }
 #endif
-  //
+
+  // Build Edge-Face connectivity map to find faces which removal
+  // may potentially lead to creation of the holes in the faces
+  // preventing from obtaining closed volume in the result
+  TopTools_IndexedDataMapOfShapeListOfShape anEFMap;
+  const Standard_Integer aNbF = theFImages.Extent();
+  for (i = 1; i <= aNbF; ++i)
+  {
+    TopTools_ListIteratorOfListOfShape itLFIm(theFImages(i));
+    for (; itLFIm.More(); itLFIm.Next())
+      TopExp::MapShapesAndAncestors(itLFIm.Value(), TopAbs_EDGE, TopAbs_FACE, anEFMap);
+  }
+
   TopTools_ListOfShape anEmptyList;
   // invalid faces inside the holes
   TopTools_IndexedMapOfShape aMFInvInHole;
@@ -1012,7 +1034,7 @@ void BuildSplitsOfFaces(const TopTools_ListOfShape& theLF,
       TopTools_MapOfShape aMFHoles;
       const TopoDS_Face& aFOr = TopoDS::Face(theFacesOrigins.Find(aF));
       FindFacesInsideHoleWires(aFOr, aF, aLFImages, theInvertedEdges,
-                               aDMEOrLEIm, aMFHoles, theDMFNewHoles, aCtx);
+                               aDMEOrLEIm, anEFMap, aMFHoles, theDMFNewHoles, aCtx);
       //
       TopTools_MapIteratorOfMapOfShape aItMH(aMFHoles);
       for (; aItMH.More(); aItMH.Next()) {
@@ -2008,6 +2030,7 @@ void FindFacesInsideHoleWires(const TopoDS_Face& theFOrigin,
                               const TopTools_ListOfShape& theLFImages,
                               const TopTools_MapOfShape& theInvertedEdges,
                               const TopTools_DataMapOfShapeListOfShape& theDMEOrLEIm,
+                              const TopTools_IndexedDataMapOfShapeListOfShape& theEFMap,
                               TopTools_MapOfShape& theMFHoles,
                               TopTools_DataMapOfShapeListOfShape& theDMFNewHoles,
                               Handle(IntTools_Context)& theContext)
@@ -2122,14 +2145,18 @@ void FindFacesInsideHoleWires(const TopoDS_Face& theFOrigin,
       }
     }
   }
-  //
+
+  // Build Edge-Face map for splits of current offset face
+  TopTools_IndexedDataMapOfShapeListOfShape anEFSplitsMap;
+  // Build Edge-Face map for holes
+  TopTools_IndexedDataMapOfShapeListOfShape anEFHolesMap;
+
   // among the splits of the offset face find those that are
   // located inside the hole faces
-  //
   TopTools_ListIteratorOfListOfShape aItLF(theLFImages);
   for (; aItLF.More(); aItLF.Next()) {
     const TopoDS_Face& aFIm = TopoDS::Face(aItLF.Value());
-    //
+    TopExp::MapShapesAndAncestors(aFIm, TopAbs_EDGE, TopAbs_FACE, anEFSplitsMap);
     // get the point inside the face and classify it relatively hole faces
     gp_Pnt aP3D;
     gp_Pnt2d aP2D;
@@ -2146,10 +2173,40 @@ void FindFacesInsideHoleWires(const TopoDS_Face& theFOrigin,
       if (theContext->IsValidPointForFace(aP3D, aFNew, aTol)) {
         // the face is classified as IN
         theMFHoles.Add(aFIm);
+        TopExp::MapShapesAndAncestors(aFIm, TopAbs_EDGE, TopAbs_FACE, anEFHolesMap);
         break;
       }
     }
   }
+
+  // Out of all found holes find those which cannot be removed
+  // by checking their connectivity to splits of other offset faces.
+  // These are the faces, which will create uncovered holes if removed.
+  const Standard_Integer aNbE = anEFHolesMap.Extent();
+  for (Standard_Integer i = 1; i <= aNbE; ++i)
+  {
+    const TopoDS_Shape& anEdge = anEFHolesMap.FindKey(i);
+    const TopTools_ListOfShape& aLFHoles = anEFHolesMap(i);
+    // Check if the edge is outer for holes
+    if (aLFHoles.Extent() != 1)
+      continue;
+
+    const TopoDS_Shape& aFHole = aLFHoles.First();
+    if (!theMFHoles.Contains(aFHole))
+      // Already removed
+      continue;
+
+    // Check if the edge is not outer for splits
+    const TopTools_ListOfShape& aLSplits = anEFSplitsMap.FindFromKey(anEdge);
+    if (aLSplits.Extent() == 1)
+      continue;
+
+    // Check if edge is only connected to splits of the current offset face
+    const TopTools_ListOfShape& aLFAll = theEFMap.FindFromKey(anEdge);
+    if (aLFAll.Extent() == 2)
+      // Avoid removal of the hole from the splits
+      theMFHoles.Remove(aFHole);
+  }
 }
 
 //=======================================================================
@@ -6620,6 +6677,98 @@ void UpdateNewIntersectionEdges(const TopTools_ListOfShape& theLE,
   }
 }
 
+//=======================================================================
+//function : FillGaps
+//purpose  : Fill possible gaps (holes) in the splits of the offset faces
+//=======================================================================
+void FillGaps(TopTools_IndexedDataMapOfShapeListOfShape& theFImages)
+{
+  Standard_Integer aNbF = theFImages.Extent();
+  if (!aNbF)
+    return;
+
+  // Check the splits of offset faces on the free edges and fill the gaps (holes)
+  // in created splits, otherwise the closed volume will not be possible to create.
+
+  // Map the splits of faces to find free edges
+  TopTools_IndexedDataMapOfShapeListOfShape anEFMap;
+  for (Standard_Integer i = 1; i <= aNbF; ++i)
+  {
+    TopTools_ListIteratorOfListOfShape itLF(theFImages(i));
+    for (; itLF.More(); itLF.Next())
+      TopExp::MapShapesAndAncestors(itLF.Value(), TopAbs_EDGE, TopAbs_FACE, anEFMap);
+  }
+
+  // Analyze images of each offset face on the presence of free edges
+  // and try to fill the holes
+  for (Standard_Integer i = 1; i <= aNbF; ++i)
+  {
+    TopTools_ListOfShape& aLFImages = theFImages(i);
+    if (aLFImages.IsEmpty())
+      continue;
+
+    // Collect all edges from the splits
+    TopoDS_Compound anEdges;
+    BRep_Builder().MakeCompound(anEdges);
+
+    // Collect all free edges into a map with reverted orientation
+    TopTools_MapOfOrientedShape aFreeEdgesMap;
+    TopTools_ListIteratorOfListOfShape itLF(aLFImages);
+    for (; itLF.More(); itLF.Next())
+    {
+      const TopoDS_Shape& aFIm = itLF.Value();
+      TopExp_Explorer anExpE(aFIm, TopAbs_EDGE);
+      for (; anExpE.More(); anExpE.Next())
+      {
+        const TopoDS_Shape& aE = anExpE.Current();
+        if (aE.Orientation() != TopAbs_FORWARD &&
+            aE.Orientation() != TopAbs_REVERSED)
+          // Skip internals
+          continue;
+
+        const TopTools_ListOfShape& aLF = anEFMap.FindFromKey(aE);
+        if (aLF.Extent() == 1)
+          aFreeEdgesMap.Add(aE.Reversed());
+
+        BRep_Builder().Add(anEdges, aE);
+      }
+    }
+
+    if (aFreeEdgesMap.IsEmpty())
+      // No free edges
+      continue;
+
+    // Free edges are found - fill the gaps by creating new splits
+    // of the face using these free edges
+    const TopoDS_Shape& aF = theFImages.FindKey(i);
+
+    // Build new splits using all kept edges and among new splits
+    // find those containing free edges
+    TopTools_ListOfShape aLFNew;
+    TopTools_DataMapOfShapeShape aDummy;
+
+    BuildSplitsOfFace(TopoDS::Face(aF), anEdges, aDummy, aLFNew);
+
+    // Find faces filling holes
+    itLF.Initialize(aLFNew);
+    for (; itLF.More(); itLF.Next())
+    {
+      const TopoDS_Shape& aFNew = itLF.Value();
+      TopExp_Explorer anExpE(aFNew, TopAbs_EDGE);
+      for (; anExpE.More(); anExpE.Next())
+      {
+        const TopoDS_Shape& aE = anExpE.Current();
+        if (aFreeEdgesMap.Contains(aE))
+        {
+          // Add face to splits
+          aLFImages.Append(aFNew);
+          break;
+        }
+      }
+    }
+  }
+}
+
 //=======================================================================
 //function : FillHistory
 //purpose  : Saving obtained results in history tools
@@ -6628,54 +6777,67 @@ void FillHistory(const TopTools_IndexedDataMapOfShapeListOfShape& theFImages,
                  const TopTools_DataMapOfShapeListOfShape& theEImages,
                  BRepAlgo_Image& theImage)
 {
-  Standard_Integer i, aNb = theFImages.Extent();
-  if (!aNb) {
+  Standard_Integer aNbF = theFImages.Extent();
+  if (!aNbF)
     return;
-  }
-  //
-  BRep_Builder aBB;
-  TopoDS_Compound aFaces;
-  aBB.MakeCompound(aFaces);
-  //
+
+#ifdef OFFSET_DEBUG
+  // Build compound of faces to see preliminary result
+  TopoDS_Compound aDFaces;
+  BRep_Builder().MakeCompound(aDFaces);
+#endif
+
+  // Map of kept edges
+  TopTools_IndexedMapOfShape anEdgesMap;
+
   // Fill history for faces
-  for (i = 1; i <= aNb; ++i) {
-    const TopoDS_Shape& aF = theFImages.FindKey(i);
+  for (Standard_Integer i = 1; i <= aNbF; ++i)
+  {
     const TopTools_ListOfShape& aLFImages = theFImages(i);
-    //
-    if (aLFImages.Extent()) {
-      if (theImage.HasImage(aF)) {
-        theImage.Add(aF, aLFImages);
-      }
-      else {
-        theImage.Bind(aF, aLFImages);
-      }
-    }
-    //
-    TopTools_ListIteratorOfListOfShape aItLF(aLFImages);
-    for (; aItLF.More(); aItLF.Next()) {
-      const TopoDS_Shape& aFIm = aItLF.Value();
-      aBB.Add(aFaces, aFIm);
+    if (aLFImages.IsEmpty())
+      continue;
+
+    // Add the splits to history map
+    const TopoDS_Shape& aF = theFImages.FindKey(i);
+    if (theImage.HasImage(aF))
+      theImage.Add(aF, aLFImages);
+    else
+      theImage.Bind(aF, aLFImages);
+
+    // Collect edges from splits
+    TopTools_ListIteratorOfListOfShape itLF(aLFImages);
+    for (; itLF.More(); itLF.Next())
+    {
+      const TopoDS_Shape& aFIm = itLF.Value();
+      TopExp::MapShapes(aFIm, TopAbs_EDGE, anEdgesMap);
+
+#ifdef OFFSET_DEBUG
+      BRep_Builder().Add(aDFaces, aFIm);
+#endif
     }
   }
-  //
-  // fill history for edges
-  TopTools_IndexedMapOfShape aMFE;
-  TopExp::MapShapes(aFaces, TopAbs_EDGE, aMFE);
-  //
+
+  // Fill history for edges (iteration by the map is safe because the
+  // order is not important here)
   TopTools_DataMapIteratorOfDataMapOfShapeListOfShape aItEIm(theEImages);
-  for (; aItEIm.More(); aItEIm.Next()) {
+  for (; aItEIm.More(); aItEIm.Next())
+  {
     const TopoDS_Shape& aE = aItEIm.Key();
     const TopTools_ListOfShape& aLEIm = aItEIm.Value();
-    //
+
     Standard_Boolean bHasImage = theImage.HasImage(aE);
     TopTools_ListIteratorOfListOfShape aItLE(aLEIm);
-    for (; aItLE.More(); aItLE.Next()) {
+    for (; aItLE.More(); aItLE.Next())
+    {
       const TopoDS_Shape& aEIm = aItLE.Value();
-      if (aMFE.Contains(aEIm)) {
-        if (bHasImage) {
+      if (anEdgesMap.Contains(aEIm))
+      {
+        if (bHasImage)
+        {
           theImage.Add(aE, aEIm);
         }
-        else {
+        else
+        {
           theImage.Bind(aE, aEIm);
           bHasImage = Standard_True;
         }

tests/offset/shape_type_i_c/XQ5

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s 10
+offsetperform result
+
+checkprops result -s 50223.9 -v 483447
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 14 -face 13 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XQ6

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s 15
+offsetperform result
+
+checkprops result -s 64158.9 -v 769275
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 22 -edge 33 -wire 13 -face 13 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XQ7

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s -1
+offsetperform result
+
+checkprops result -s 24539 -v 76024.4
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 16 -face 14 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XQ8

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s -4
+offsetperform result
+
+checkprops result -s 17189.5 -v 13539.5
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 16 -face 14 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XQ9

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s 10
+offsetperform result
+
+checkprops result -s 50012 -v 483317
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 18 -edge 27 -wire 13 -face 12 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR1

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s 15
+offsetperform result
+
+checkprops result -s 63275.6 -v 766036
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 18 -edge 27 -wire 13 -face 12 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR2

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s 30
+offsetperform result
+
+checkprops result -s 108719 -v 2.04716e+06
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 12 -face 12 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR3

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s -1
+offsetperform result
+
+checkprops result -s 24539 -v 76024.4
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 16 -face 14 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR4

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged_trim.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s -4
+offsetperform result
+
+checkprops result -s 17189.5 -v 13539.5
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 20 -edge 30 -wire 16 -face 14 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR5

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s 12
+offsetperform result
+
+checkprops result -s 1.73666e+06 -v 4.87923e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 164 -edge 246 -wire 114 -face 99 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR6

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s 25
+offsetperform result
+
+checkprops result -s 2.03999e+06 -v 7.33418e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 162 -edge 243 -wire 111 -face 97 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR7

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s -1
+offsetperform result
+
+checkprops result -s 1.43927e+06 -v 2.81518e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 166 -edge 249 -wire 119 -face 102 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR8

@@ -0,0 +1,12 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+offsetparameter 1.e-7 c i r
+offsetload s -4
+offsetperform result
+
+checkprops result -s 1.36916e+06 -v 2.39392e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 166 -edge 249 -wire 119 -face 102 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XR9

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s 12
+offsetperform result
+
+checkprops result -s 1.73611e+06 -v 4.87914e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 162 -edge 243 -wire 113 -face 98 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XS1

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s 25
+offsetperform result
+
+checkprops result -s 2.03958e+06 -v 7.33246e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 162 -edge 243 -wire 113 -face 98 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XS2

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s -1
+offsetperform result
+
+checkprops result -s 1.43927e+06 -v 2.81518e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 166 -edge 249 -wire 119 -face 102 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png

tests/offset/shape_type_i_c/XS3

@@ -0,0 +1,13 @@
+restore [locate_data_file bug30394_input_no_merged.brep] s
+
+unifysamedom s s +i
+offsetparameter 1.e-7 c i r
+offsetload s -4
+offsetperform result
+
+checkprops result -s 1.36916e+06 -v 2.39392e+07
+
+unifysamedom result_unif result
+checknbshapes result_unif -vertex 166 -edge 249 -wire 119 -face 102 -shell 1 -solid 1
+
+checkview -display result_unif -2d -path ${imagedir}/${test_image}.png