From 5e18f9171902f8470e740b6d6d26fbb23d5819bd Mon Sep 17 00:00:00 2001
From: emv <emv@opencascade.com>
Date: Thu, 30 Apr 2015 13:31:47 +0300
Subject: [PATCH] 0026112: Exception is raised during perform of General Fuse
 operation

class BOPAlgo_WireSplitter
method
Standard_Boolean RefineAngle2D(const TopoDS_Vertex& aV,
                               const TopoDS_Edge& aE,
                               const TopoDS_Face& myFace,
                               const Standard_Real aA1,
                               const Standard_Real aA2,
                               Standard_Real& aA)

Protection from null vector.

Test case for issue CR26112
---
 src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx |  3 ++
 tests/bugs/modalg_6/bug26112           | 38 ++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100755 tests/bugs/modalg_6/bug26112

diff --git a/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx b/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
index 0afa8ad9a4..34408661d9 100644
--- a/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
+++ b/src/BOPAlgo/BOPAlgo_WireSplitter_1.cxx
@@ -1061,6 +1061,9 @@ Standard_Boolean RefineAngle2D(const TopoDS_Vertex& aV,
     }
     //
     dT = aTOp - aT1max;
+    if (Abs(dT) < aTolInt) {
+      continue;
+    }
     //
     aT=aT1max + aCf*dT;
     aC2D->D0(aT, aP);
diff --git a/tests/bugs/modalg_6/bug26112 b/tests/bugs/modalg_6/bug26112
new file mode 100755
index 0000000000..827db18d2d
--- /dev/null
+++ b/tests/bugs/modalg_6/bug26112
@@ -0,0 +1,38 @@
+puts "============"
+puts "OCC26112"
+puts "============"
+puts ""
+###############################
+## Exception is raised during perform of General Fuse operation
+###############################
+
+restore [locate_data_file bug26112_c.brep ] c
+
+explode c
+
+bclearobjects
+bcleartools
+baddobjects c_1
+baddtools c_2
+
+bfillds
+bbuild result
+
+set square 122.7
+
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX    : 7
+ EDGE      : 10
+ WIRE      : 5
+ FACE      : 4
+ SHELL     : 0
+ SOLID     : 0
+ COMPSOLID : 0
+ COMPOUND  : 1
+ SHAPE     : 27
+"
+
+checknbshapes result -ref ${nbshapes_expected} -t -m "Result obtained by General Fuse operator"
+
+set 3dviewer 1