From acce2c1448254a2e57cc940dc479a795dcc3f5f0 Mon Sep 17 00:00:00 2001
From: vro <vro@opencascade.com>
Date: Tue, 22 Feb 2022 17:00:09 +0300
Subject: [PATCH] 0032796: Modeling Data - Calculation of distance between two
 circles crashes

Modified:
- Extrema_ExtCC.cxx, the method PrepareParallelResult() - angular tolerance is increased.

Added:
- A test: lowalgos extcc bug32796
---
 src/Extrema/Extrema_ExtCC.cxx |  3 +--
 tests/lowalgos/extcc/bug32796 | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 tests/lowalgos/extcc/bug32796

diff --git a/src/Extrema/Extrema_ExtCC.cxx b/src/Extrema/Extrema_ExtCC.cxx
index d19c246472..389e2a0dde 100644
--- a/src/Extrema/Extrema_ExtCC.cxx
+++ b/src/Extrema/Extrema_ExtCC.cxx
@@ -663,7 +663,7 @@ void Extrema_ExtCC::PrepareParallelResult(const Standard_Real theUt11,
       //    myIsParallel = TRUE and only the least distance will be returned.
       //4. Arcs are not parallel. Then several (or single) extremas will be returned.
 
-      if (aRng.Delta() > Precision::Angular())
+      if (aRng.Delta() > Precision::Confusion())
       {
         Standard_Real aPar = 0.0;
         aRng.GetIntermediatePoint(0.5, aPar);
@@ -703,7 +703,6 @@ void Extrema_ExtCC::PrepareParallelResult(const Standard_Real theUt11,
             break;
           }
         }
-
         //Nearer solution can be found
       }
       else if (!aRng.IsVoid())
diff --git a/tests/lowalgos/extcc/bug32796 b/tests/lowalgos/extcc/bug32796
new file mode 100644
index 0000000000..bc862c10d7
--- /dev/null
+++ b/tests/lowalgos/extcc/bug32796
@@ -0,0 +1,15 @@
+puts "============"
+puts "OCC32796: Modeling Data - Calculation of distance between two circles crashes"
+puts "============"
+puts ""
+
+restore [locate_data_file bug32796e1.brep] e1
+restore [locate_data_file bug32796e2.brep] e2
+mkcurve c1 e1
+mkcurve c2 e2
+
+if [catch { extrema c1 c2 }] {
+  puts "Calculation of distance between two circles crashes"
+} else {
+  puts "Calculation of distance between two circles is OK"
+}