0029845: UnifySameDomain does not account the accumulated angle when unifying edges

Check that the accumulated angle does not exceed the given angular tolerance while merging the linear edges.
Test case for the issue.

diff --git a/src/ShapeUpgrade/ShapeUpgrade_UnifySameDomain.cxx b/src/ShapeUpgrade/ShapeUpgrade_UnifySameDomain.cxx
index 4a30612..48d75e2 100644 (file)
--- a/src/ShapeUpgrade/ShapeUpgrade_UnifySameDomain.cxx
+++ b/src/ShapeUpgrade/ShapeUpgrade_UnifySameDomain.cxx
@@ -849,12 +849,20 @@ static Standard_Boolean IsMergingPossible(const TopoDS_Edge& edge1, const TopoDS
 
   if (theLineDirectionOk && t2 == GeomAbs_Line)
   {
+    // Check that the accumulated deflection does not exceed the linear tolerance
     Standard_Real aLast = (edge2.Orientation() == TopAbs_FORWARD) ?
       ade2.LastParameter() : ade2.FirstParameter();
     gp_Vec aCurV(theFirstPoint, ade2.Value(aLast));
     Standard_Real aDD = theDirectionVec.CrossSquareMagnitude(aCurV);
     if (aDD > theLinTol*theLinTol)
       return Standard_False;
+
+    // Check that the accumulated angle does not exceed the angular tolerance.
+    // For symmetry, check the angle between vectors of:
+    // - first edge and resulting curve, and
+    // - the last edge and resulting curve.
+    if (theDirectionVec.Angle(aCurV) > theAngTol || Diff2.Angle(aCurV) > theAngTol)
+      return Standard_False;
   }
 
   return Standard_True;

diff --git a/tests/bugs/modalg_7/bug29845 b/tests/bugs/modalg_7/bug29845
new file mode 100644 (file)
index 0000000..e598d20
--- /dev/null
+++ b/tests/bugs/modalg_7/bug29845
@@ -0,0 +1,21 @@
+puts "========"
+puts "OCC29845:UnifySameDomain does not account the accumulated angle when unifying edges"
+puts "========"
+puts ""
+
+brestore [locate_data_file bug29845_wire.brep] w
+
+# set the linear deflection very high, so the unification
+# will be controlled by the angular deflection only.
+# with the angular deflection of 5 degrees the resulting
+# wire should preserve all the features of the original wire
+
+unifysamedom result w -t 10000 -a 5
+checkshape result
+checknbshapes result -vertex 77 -edge 77
+checkprops result -l 2805.11
+
+smallview +X+Z
+don result
+fit
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png