From 06f68996cf1584e9ad538cba796a9bfc36844aae Mon Sep 17 00:00:00 2001
From: jgv <jgv@opencascade.com>
Date: Mon, 14 Sep 2020 18:51:50 +0300
Subject: [PATCH] 0031766: Modeling Algorithms - Instability on pipe bugs
 bug26088 test case

Correction in GeomFill_Sweep: set the flags "myExchUV", "isUReversed", "isVReversed" to FALSE (initial state) after failure of BuildKPart method.
---
 src/GeomFill/GeomFill_Sweep.cxx |  7 +++++++
 tests/pipe/bugs/bug26088        | 10 ++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/GeomFill/GeomFill_Sweep.cxx b/src/GeomFill/GeomFill_Sweep.cxx
index af96a3d6ea..95804f3d26 100644
--- a/src/GeomFill/GeomFill_Sweep.cxx
+++ b/src/GeomFill/GeomFill_Sweep.cxx
@@ -219,6 +219,12 @@ GeomFill_Sweep::GeomFill_Sweep(const Handle(GeomFill_LocationLaw)& Location,
  
  // Traitement des KPart
  if (myKPart)  isKPart = BuildKPart();
+
+ if (!isKPart)
+ {
+   myExchUV = Standard_False;
+   isUReversed = isVReversed = Standard_False;
+ }
  
  // Traitement des produits Formelles
  if ((!isKPart) && (Methode == GeomFill_Location)) {
@@ -876,6 +882,7 @@ static Standard_Boolean IsSweepParallelSpine (const Handle(GeomFill_LocationLaw)
               // l == f - "degenerated" surface
               // UlastOnSec - UfirstOnSec > M_PI_2 - "twisted" surface,
               // it is impossible to represent with help of trimmed sphere
+	      isUReversed = Standard_False;
               return Ok;
             }
 
diff --git a/tests/pipe/bugs/bug26088 b/tests/pipe/bugs/bug26088
index 3550592973..f965759185 100755
--- a/tests/pipe/bugs/bug26088
+++ b/tests/pipe/bugs/bug26088
@@ -10,6 +10,16 @@ restore [locate_data_file bug26088_profile0.brep] pr
 # path and profile
 pipe result p pr
 
+checkshape result
+
+checknbshapes result -vertex 8 -edge 14 -wire 6 -face 6 -shell 1
+
+set tolres [checkmaxtol result]
+
+if { ${tolres} > 1.e-4} {
+   puts "Error: bad tolerance of result"
+}
+
 smallview
 fit
 checkview -screenshot -2d -path ${imagedir}/${test_image}.png