From: mbs <martin.bernhard@opencascade.com>
Date: Thu, 19 Jan 2023 10:19:41 +0000 (+0000)
Subject: added checkbox in UI for optional fuzzy parameter
X-Git-Tag: V9_12_0a1~16^2~32^2~21
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=ac6689aff8d62d06f13c278d146978a303a0e7db;p=modules%2Fshaper.git

added checkbox in UI for optional fuzzy parameter
---

diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanCommon.cpp b/src/FeaturesAPI/FeaturesAPI_BooleanCommon.cpp
index 7b8fe4217..c54ffa2cc 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanCommon.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanCommon.cpp
@@ -23,6 +23,10 @@
 #include <ModelHighAPI_Selection.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_BooleanCommon::FeaturesAPI_BooleanCommon(
   const std::shared_ptr<ModelAPI_Feature>& theFeature)
@@ -39,9 +43,12 @@ FeaturesAPI_BooleanCommon::FeaturesAPI_BooleanCommon(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(FeaturesPlugin_BooleanCommon::CREATION_METHOD_SIMPLE(), mycreationMethod);
     fillAttribute(theMainObjects, mymainObjects);
-    fillAttribute(theFuzzy, myfuzzyValue);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyValue);
 
     execute(false);
   }
@@ -56,10 +63,13 @@ FeaturesAPI_BooleanCommon::FeaturesAPI_BooleanCommon(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(FeaturesPlugin_BooleanCommon::CREATION_METHOD_ADVANCED(), mycreationMethod);
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theToolObjects, mytoolObjects);
-    fillAttribute(theFuzzy, myfuzzyValue);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyValue);
 
     execute(false);
   }
@@ -90,6 +100,14 @@ void FeaturesAPI_BooleanCommon::setToolObjects(
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_BooleanCommon::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_BooleanCommon::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -123,6 +141,7 @@ void FeaturesAPI_BooleanCommon::dump(ModelHighAPI_Dumper& theDumper) const
     aBase->selectionList(FeaturesPlugin_BooleanCommon::OBJECT_LIST_ID());
   AttributeSelectionListPtr aTools =
     aBase->selectionList(FeaturesPlugin_BooleanCommon::TOOL_LIST_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_BooleanCommon::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_BooleanCommon::FUZZY_PARAM_ID())->value();
 
   theDumper << "(" << aDocName << ", " << anObjects;
@@ -131,7 +150,8 @@ void FeaturesAPI_BooleanCommon::dump(ModelHighAPI_Dumper& theDumper) const
     theDumper << ", " << aTools;
   }
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanCommon.h b/src/FeaturesAPI/FeaturesAPI_BooleanCommon.h
index b5daab109..ae8821c76 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanCommon.h
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanCommon.h
@@ -45,26 +45,28 @@ public:
   FEATURESAPI_EXPORT
   FeaturesAPI_BooleanCommon(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                             const std::list<ModelHighAPI_Selection>& theMainObjects,
-                            const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                            const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Constructor with values.
   FEATURESAPI_EXPORT
   FeaturesAPI_BooleanCommon(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                             const std::list<ModelHighAPI_Selection>& theMainObjects,
                             const std::list<ModelHighAPI_Selection>& theToolObjects,
-                            const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                            const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_BooleanCommon();
 
-  INTERFACE_4(FeaturesPlugin_BooleanCommon::ID(),
+  INTERFACE_5(FeaturesPlugin_BooleanCommon::ID(),
               creationMethod, FeaturesPlugin_BooleanCommon::CREATION_METHOD(),
               ModelAPI_AttributeString, /** Creation method */,
               mainObjects, FeaturesPlugin_BooleanCommon::OBJECT_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Main objects */,
               toolObjects, FeaturesPlugin_BooleanCommon::TOOL_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Tool objects*/,
+              useFuzzy, FeaturesPlugin_BooleanCommon::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyValue, FeaturesPlugin_BooleanCommon::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter*/)
 
@@ -76,6 +78,10 @@ public:
   FEATURESAPI_EXPORT
   void setToolObjects(const std::list<ModelHighAPI_Selection>& theToolObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -98,7 +104,7 @@ FEATURESAPI_EXPORT BooleanCommonPtr addCommon(
     const std::shared_ptr<ModelAPI_Document>& part,
     const std::list<ModelHighAPI_Selection>& objects,
     const std::list<ModelHighAPI_Selection>& tools = std::list<ModelHighAPI_Selection>(),
-    const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+    const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
     const bool keepSubResults = false);
 
 #endif // FeaturesAPI_BooleanCommon_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanCut.cpp b/src/FeaturesAPI/FeaturesAPI_BooleanCut.cpp
index 8bb3e9e40..1b3f10dcc 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanCut.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanCut.cpp
@@ -23,6 +23,10 @@
 #include <ModelHighAPI_Selection.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_BooleanCut::FeaturesAPI_BooleanCut(const std::shared_ptr<ModelAPI_Feature>& theFeature)
 : ModelHighAPI_Interface(theFeature)
@@ -39,9 +43,12 @@ FeaturesAPI_BooleanCut::FeaturesAPI_BooleanCut(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theToolObjects, mytoolObjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute(false);
   }
@@ -69,6 +76,14 @@ void FeaturesAPI_BooleanCut::setToolObjects(const std::list<ModelHighAPI_Selecti
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_BooleanCut::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_BooleanCut::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -89,11 +104,13 @@ void FeaturesAPI_BooleanCut::dump(ModelHighAPI_Dumper& theDumper) const
     aBase->selectionList(FeaturesPlugin_BooleanCut::OBJECT_LIST_ID());
   AttributeSelectionListPtr aTools =
     aBase->selectionList(FeaturesPlugin_BooleanCut::TOOL_LIST_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_BooleanCut::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_BooleanCut::FUZZY_PARAM_ID())->value();
 
   theDumper << "(" << aDocName << ", " << anObjects << ", " << aTools;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanCut.h b/src/FeaturesAPI/FeaturesAPI_BooleanCut.h
index 09f673743..cc44d0957 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanCut.h
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanCut.h
@@ -46,17 +46,19 @@ public:
   FeaturesAPI_BooleanCut(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                          const std::list<ModelHighAPI_Selection>& theMainObjects,
                          const std::list<ModelHighAPI_Selection>& theToolObjects,
-                         const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                         const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_BooleanCut();
 
-  INTERFACE_3(FeaturesPlugin_BooleanCut::ID(),
+  INTERFACE_4(FeaturesPlugin_BooleanCut::ID(),
               mainObjects, FeaturesPlugin_BooleanCut::OBJECT_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Main objects */,
               toolObjects, FeaturesPlugin_BooleanCut::TOOL_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Tool objects*/,
+              useFuzzy, FeaturesPlugin_BooleanCut::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_BooleanCut::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -68,6 +70,10 @@ public:
   FEATURESAPI_EXPORT
   void setToolObjects(const std::list<ModelHighAPI_Selection>& theToolObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -86,7 +92,7 @@ FEATURESAPI_EXPORT
 BooleanCutPtr addCut(const std::shared_ptr<ModelAPI_Document>& thePart,
                      const std::list<ModelHighAPI_Selection>& theMainObjects,
                      const std::list<ModelHighAPI_Selection>& theToolObjects,
-                     const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                     const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                      const bool keepSubResults = false);
 
 #endif // FeaturesAPI_BooleanCut_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanFill.cpp b/src/FeaturesAPI/FeaturesAPI_BooleanFill.cpp
index 09d4a4774..ed635775d 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanFill.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanFill.cpp
@@ -23,6 +23,10 @@
 #include <ModelHighAPI_Selection.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_BooleanFill::FeaturesAPI_BooleanFill(
   const std::shared_ptr<ModelAPI_Feature>& theFeature)
@@ -40,9 +44,12 @@ FeaturesAPI_BooleanFill::FeaturesAPI_BooleanFill(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theToolObjects, mytoolObjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute(false);
   }
@@ -72,6 +79,14 @@ void FeaturesAPI_BooleanFill::setToolObjects(
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_BooleanFill::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_BooleanFill::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -92,11 +107,13 @@ void FeaturesAPI_BooleanFill::dump(ModelHighAPI_Dumper& theDumper) const
     aBase->selectionList(FeaturesPlugin_BooleanFill::OBJECT_LIST_ID());
   AttributeSelectionListPtr aTools =
     aBase->selectionList(FeaturesPlugin_BooleanFill::TOOL_LIST_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_BooleanFill::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_BooleanFill::FUZZY_PARAM_ID())->value();
 
   theDumper << "(" << aDocName << ", " << anObjects << ", " << aTools;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanFill.h b/src/FeaturesAPI/FeaturesAPI_BooleanFill.h
index 35743ffc9..fd31f84d7 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanFill.h
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanFill.h
@@ -46,17 +46,19 @@ public:
   FeaturesAPI_BooleanFill(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                           const std::list<ModelHighAPI_Selection>& theMainObjects,
                           const std::list<ModelHighAPI_Selection>& theToolObjects,
-                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_BooleanFill();
 
-  INTERFACE_3(FeaturesPlugin_BooleanFill::ID(),
+  INTERFACE_4(FeaturesPlugin_BooleanFill::ID(),
               mainObjects, FeaturesPlugin_BooleanFill::OBJECT_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Main objects */,
               toolObjects, FeaturesPlugin_BooleanFill::TOOL_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Tool objects*/,
+              useFuzzy, FeaturesPlugin_BooleanFill::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_BooleanFill::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -68,6 +70,10 @@ public:
   FEATURESAPI_EXPORT
   void setToolObjects(const std::list<ModelHighAPI_Selection>& theToolObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -86,7 +92,7 @@ FEATURESAPI_EXPORT
 BooleanFillPtr addSplit(const std::shared_ptr<ModelAPI_Document>& thePart,
                         const std::list<ModelHighAPI_Selection>& theMainObjects,
                         const std::list<ModelHighAPI_Selection>& theToolObjects,
-                        const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                        const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                         const bool keepSubResults = false);
 
 #endif // FeaturesAPI_BooleanFill_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanFuse.cpp b/src/FeaturesAPI/FeaturesAPI_BooleanFuse.cpp
index 2fd8df093..accab6d10 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanFuse.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanFuse.cpp
@@ -23,6 +23,10 @@
 #include <ModelHighAPI_Selection.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_BooleanFuse::FeaturesAPI_BooleanFuse(
   const std::shared_ptr<ModelAPI_Feature>& theFeature)
@@ -40,10 +44,13 @@ FeaturesAPI_BooleanFuse::FeaturesAPI_BooleanFuse(
   : ModelHighAPI_Interface(theFeature)
 {
   if (initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(FeaturesPlugin_BooleanFuse::CREATION_METHOD_SIMPLE(), mycreationMethod);
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theRemoveEdges, myremoveEdges);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute(false);
   }
@@ -59,11 +66,14 @@ FeaturesAPI_BooleanFuse::FeaturesAPI_BooleanFuse(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(FeaturesPlugin_BooleanFuse::CREATION_METHOD_ADVANCED(), mycreationMethod);
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theToolObjects, mytoolObjects);
     fillAttribute(theRemoveEdges, myremoveEdges);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute(false);
   }
@@ -102,6 +112,14 @@ void FeaturesAPI_BooleanFuse::setRemoveEdges(const bool theRemoveEdges)
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_BooleanFuse::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_BooleanFuse::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -137,6 +155,7 @@ void FeaturesAPI_BooleanFuse::dump(ModelHighAPI_Dumper& theDumper) const
     aBase->selectionList(FeaturesPlugin_BooleanFuse::TOOL_LIST_ID());
   AttributeBooleanPtr aRemoveEdges =
     aBase->boolean(FeaturesPlugin_BooleanFuse::REMOVE_INTERSECTION_EDGES_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_BooleanFuse::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_BooleanFuse::FUZZY_PARAM_ID())->value();
 
   theDumper << "(" << aDocName << ", " << anObjects;
@@ -149,9 +168,8 @@ void FeaturesAPI_BooleanFuse::dump(ModelHighAPI_Dumper& theDumper) const
     theDumper << ", removeEdges = True";
   }
 
-  if (aFuzzy != 1.e-8) {
+  if (aUseFuzzy)
     theDumper << ", fuzzyParam = " << aFuzzy;
-  }
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanFuse.h b/src/FeaturesAPI/FeaturesAPI_BooleanFuse.h
index 04da890e6..ffe594d67 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanFuse.h
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanFuse.h
@@ -46,7 +46,7 @@ public:
   FeaturesAPI_BooleanFuse(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                           const std::list<ModelHighAPI_Selection>& theMainObjects,
                           const bool theRemoveEdges = false,
-                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Constructor with values.
   FEATURESAPI_EXPORT
@@ -54,13 +54,13 @@ public:
                           const std::list<ModelHighAPI_Selection>& theMainObjects,
                           const std::list<ModelHighAPI_Selection>& theToolObjects,
                           const bool theRemoveEdges = false,
-                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                          const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_BooleanFuse();
 
-  INTERFACE_5(FeaturesPlugin_BooleanFuse::ID(),
+  INTERFACE_6(FeaturesPlugin_BooleanFuse::ID(),
               creationMethod, FeaturesPlugin_BooleanFuse::CREATION_METHOD(),
               ModelAPI_AttributeString, /** Creation method */,
               mainObjects, FeaturesPlugin_BooleanFuse::OBJECT_LIST_ID(),
@@ -69,6 +69,8 @@ public:
               ModelAPI_AttributeSelectionList, /** Tool objects*/,
               removeEdges, FeaturesPlugin_BooleanFuse::REMOVE_INTERSECTION_EDGES_ID(),
               ModelAPI_AttributeBoolean, /** Remove edges */,
+              useFuzzy, FeaturesPlugin_BooleanFuse::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_BooleanFuse::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -84,6 +86,10 @@ public:
   FEATURESAPI_EXPORT
   void setRemoveEdges(const bool theRemoveEdges);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -110,7 +116,7 @@ FEATURESAPI_EXPORT BooleanFusePtr addFuse(
     const std::list<ModelHighAPI_Selection>& objects,
     const std::pair<std::list<ModelHighAPI_Selection>, bool>& tools = DUMMY_TOOLS,
     const bool removeEdges = false,
-    const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+    const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
     const bool keepSubResults = false);
 
 #endif // FeaturesAPI_BooleanFuse_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanSmash.cpp b/src/FeaturesAPI/FeaturesAPI_BooleanSmash.cpp
index 7c5ce1722..94eb7d6d4 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanSmash.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanSmash.cpp
@@ -23,6 +23,10 @@
 #include <ModelHighAPI_Selection.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_BooleanSmash::FeaturesAPI_BooleanSmash(
   const std::shared_ptr<ModelAPI_Feature>& theFeature)
@@ -40,9 +44,12 @@ FeaturesAPI_BooleanSmash::FeaturesAPI_BooleanSmash(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theMainObjects, mymainObjects);
     fillAttribute(theToolObjects, mytoolObjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute(false);
   }
@@ -72,6 +79,14 @@ void FeaturesAPI_BooleanSmash::setToolObjects(
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_BooleanSmash::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_BooleanSmash::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -92,11 +107,13 @@ void FeaturesAPI_BooleanSmash::dump(ModelHighAPI_Dumper& theDumper) const
     aBase->selectionList(FeaturesPlugin_BooleanSmash::OBJECT_LIST_ID());
   AttributeSelectionListPtr aTools =
     aBase->selectionList(FeaturesPlugin_BooleanSmash::TOOL_LIST_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_BooleanSmash::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_BooleanSmash::FUZZY_PARAM_ID())->value();
 
   theDumper << "(" << aDocName << ", " << anObjects << ", " << aTools;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_BooleanSmash.h b/src/FeaturesAPI/FeaturesAPI_BooleanSmash.h
index 188079af7..11d224057 100644
--- a/src/FeaturesAPI/FeaturesAPI_BooleanSmash.h
+++ b/src/FeaturesAPI/FeaturesAPI_BooleanSmash.h
@@ -46,17 +46,19 @@ public:
   FeaturesAPI_BooleanSmash(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                            const std::list<ModelHighAPI_Selection>& theMainObjects,
                            const std::list<ModelHighAPI_Selection>& theToolObjects,
-                           const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                           const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_BooleanSmash();
 
-  INTERFACE_3(FeaturesPlugin_BooleanSmash::ID(),
+  INTERFACE_4(FeaturesPlugin_BooleanSmash::ID(),
               mainObjects, FeaturesPlugin_BooleanSmash::OBJECT_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Main objects */,
               toolObjects, FeaturesPlugin_BooleanSmash::TOOL_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Tool objects*/,
+              useFuzzy, FeaturesPlugin_BooleanSmash::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_BooleanSmash::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -68,6 +70,10 @@ public:
   FEATURESAPI_EXPORT
   void setToolObjects(const std::list<ModelHighAPI_Selection>& theToolObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -86,7 +92,7 @@ FEATURESAPI_EXPORT
 BooleanSmashPtr addSmash(const std::shared_ptr<ModelAPI_Document>& thePart,
                          const std::list<ModelHighAPI_Selection>& theMainObjects,
                          const std::list<ModelHighAPI_Selection>& theToolObjects,
-                         const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                         const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                          const bool keepSubResults = false);
 
 #endif // FeaturesAPI_BooleanSmash_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_Intersection.cpp b/src/FeaturesAPI/FeaturesAPI_Intersection.cpp
index 6ceafb170..76806c3c4 100644
--- a/src/FeaturesAPI/FeaturesAPI_Intersection.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_Intersection.cpp
@@ -22,6 +22,10 @@
 #include <ModelHighAPI_Dumper.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_Intersection::FeaturesAPI_Intersection(
   const std::shared_ptr<ModelAPI_Feature>& theFeature)
@@ -38,8 +42,11 @@ FeaturesAPI_Intersection::FeaturesAPI_Intersection(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theObjects, myobjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute();
   }
@@ -59,6 +66,14 @@ void FeaturesAPI_Intersection::setObjects(const std::list<ModelHighAPI_Selection
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_Intersection::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_Intersection::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -75,11 +90,13 @@ void FeaturesAPI_Intersection::dump(ModelHighAPI_Dumper& theDumper) const
 
   AttributeSelectionListPtr anAttrObjects =
     aBase->selectionList(FeaturesPlugin_Intersection::OBJECT_LIST_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_Intersection::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_Intersection::FUZZY_PARAM_ID())->value();
 
   theDumper << aBase << " = model.addIntersection(" << aDocName << ", " << anAttrObjects;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_Intersection.h b/src/FeaturesAPI/FeaturesAPI_Intersection.h
index f69daaff6..653962c2a 100644
--- a/src/FeaturesAPI/FeaturesAPI_Intersection.h
+++ b/src/FeaturesAPI/FeaturesAPI_Intersection.h
@@ -45,15 +45,17 @@ public:
   FEATURESAPI_EXPORT
   explicit FeaturesAPI_Intersection(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                                     const std::list<ModelHighAPI_Selection>& theObjects,
-                                    const ModelHighAPI_Double& aFuzzy = ModelHighAPI_Double(1.e-8));
+                                    const ModelHighAPI_Double& aFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_Intersection();
 
-  INTERFACE_2(FeaturesPlugin_Intersection::ID(),
+  INTERFACE_3(FeaturesPlugin_Intersection::ID(),
               objects, FeaturesPlugin_Intersection::OBJECT_LIST_ID(),
               ModelAPI_AttributeSelectionList, /** Objects */,
+              useFuzzy, FeaturesPlugin_Intersection::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_Intersection::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -61,6 +63,10 @@ public:
   FEATURESAPI_EXPORT
   void setObjects(const std::list<ModelHighAPI_Selection>& theObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -78,7 +84,7 @@ typedef std::shared_ptr<FeaturesAPI_Intersection> IntersectionPtr;
 FEATURESAPI_EXPORT
 IntersectionPtr addIntersection(const std::shared_ptr<ModelAPI_Document>& part,
                                 const std::list<ModelHighAPI_Selection>& objects,
-                                const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                                const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                                 const bool keepSubResults = false);
 
 #endif // FeaturesAPI_Intersection_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_Partition.cpp b/src/FeaturesAPI/FeaturesAPI_Partition.cpp
index c7ca9aa40..d4e84c69d 100644
--- a/src/FeaturesAPI/FeaturesAPI_Partition.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_Partition.cpp
@@ -22,6 +22,10 @@
 #include <ModelHighAPI_Dumper.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesAPI_Partition::FeaturesAPI_Partition(const std::shared_ptr<ModelAPI_Feature>& theFeature)
 : ModelHighAPI_Interface(theFeature)
@@ -37,8 +41,11 @@ FeaturesAPI_Partition::FeaturesAPI_Partition(
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theBaseObjects, mybaseObjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
     execute();
   }
 }
@@ -57,6 +64,14 @@ void FeaturesAPI_Partition::setBase(const std::list<ModelHighAPI_Selection>& the
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_Partition::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_Partition::setFuzzy(const ModelHighAPI_Double& theFuzzy)
 {
@@ -73,11 +88,13 @@ void FeaturesAPI_Partition::dump(ModelHighAPI_Dumper& theDumper) const
 
   AttributeSelectionListPtr anAttrObjects =
     aBase->selectionList(FeaturesPlugin_Partition::BASE_OBJECTS_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_Partition::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_Partition::FUZZY_PARAM_ID())->value();
 
   theDumper << aBase << " = model.addPartition(" << aDocName << ", " << anAttrObjects;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_Partition.h b/src/FeaturesAPI/FeaturesAPI_Partition.h
index 3e533ff93..224470897 100644
--- a/src/FeaturesAPI/FeaturesAPI_Partition.h
+++ b/src/FeaturesAPI/FeaturesAPI_Partition.h
@@ -45,15 +45,17 @@ public:
   FEATURESAPI_EXPORT
   explicit FeaturesAPI_Partition(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                                  const std::list<ModelHighAPI_Selection>& theBaseObjects,
-                                 const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                                 const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_Partition();
 
-  INTERFACE_2(FeaturesPlugin_Partition::ID(),
+  INTERFACE_3(FeaturesPlugin_Partition::ID(),
               baseObjects, FeaturesPlugin_Partition::BASE_OBJECTS_ID(),
               ModelAPI_AttributeSelectionList, /** Base objects */,
+              useFuzzy, FeaturesPlugin_Partition::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_Partition::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -61,6 +63,10 @@ public:
   FEATURESAPI_EXPORT
   void setBase(const std::list<ModelHighAPI_Selection>& theBaseObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Modify fuzzy parameter attribute of the feature.
   FEATURESAPI_EXPORT
   void setFuzzy(const ModelHighAPI_Double& theFuzzy);
@@ -78,7 +84,7 @@ typedef std::shared_ptr<FeaturesAPI_Partition> PartitionPtr;
 FEATURESAPI_EXPORT
 PartitionPtr addPartition(const std::shared_ptr<ModelAPI_Document>& thePart,
                           const std::list<ModelHighAPI_Selection>& theBaseObjects,
-                          const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                          const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                           const bool keepSubResults = false);
 
 #endif // FeaturesAPI_Partition_H_
diff --git a/src/FeaturesAPI/FeaturesAPI_Union.cpp b/src/FeaturesAPI/FeaturesAPI_Union.cpp
index 30e4234b2..81ca4d231 100644
--- a/src/FeaturesAPI/FeaturesAPI_Union.cpp
+++ b/src/FeaturesAPI/FeaturesAPI_Union.cpp
@@ -22,6 +22,10 @@
 #include <ModelHighAPI_Dumper.h>
 #include <ModelHighAPI_Tools.h>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //================================================================================================
 FeaturesAPI_Union::FeaturesAPI_Union(const std::shared_ptr<ModelAPI_Feature>& theFeature)
 : ModelHighAPI_Interface(theFeature)
@@ -36,8 +40,11 @@ FeaturesAPI_Union::FeaturesAPI_Union(const std::shared_ptr<ModelAPI_Feature>& th
 : ModelHighAPI_Interface(theFeature)
 {
   if(initialize()) {
+    bool aUseFuzzy = (theFuzzy.value() > 0);
+    ModelHighAPI_Double aFuzzy = (aUseFuzzy ? theFuzzy : ModelHighAPI_Double(DEFAULT_FUZZY));
     fillAttribute(theBaseObjects, mybaseObjects);
-    fillAttribute(theFuzzy, myfuzzyParam);
+    fillAttribute(aUseFuzzy, myuseFuzzy);
+    fillAttribute(aFuzzy, myfuzzyParam);
 
     execute();
   }
@@ -57,6 +64,14 @@ void FeaturesAPI_Union::setBase(const std::list<ModelHighAPI_Selection>& theBase
   execute();
 }
 
+//==================================================================================================
+void FeaturesAPI_Union::setUseFuzzy(bool theUseFuzzy)
+{
+  fillAttribute(theUseFuzzy, myuseFuzzy);
+
+  execute();
+}
+
 //==================================================================================================
 void FeaturesAPI_Union::setFuzzyValue(const ModelHighAPI_Double& theFuzzy)
 {
@@ -73,11 +88,13 @@ void FeaturesAPI_Union::dump(ModelHighAPI_Dumper& theDumper) const
 
   AttributeSelectionListPtr anAttrObjects =
     aBase->selectionList(FeaturesPlugin_Union::BASE_OBJECTS_ID());
+  bool aUseFuzzy = aBase->boolean(FeaturesPlugin_Union::USE_FUZZY_ID())->value();
   double aFuzzy = aBase->real(FeaturesPlugin_Union::FUZZY_PARAM_ID())->value();
 
   theDumper << aBase << " = model.addUnion(" << aDocName << ", " << anAttrObjects;
 
-  theDumper << ", fuzzyParam = " << aFuzzy;
+  if (aUseFuzzy)
+    theDumper << ", fuzzyParam = " << aFuzzy;
 
   if (!aBase->data()->version().empty())
     theDumper << ", keepSubResults = True";
diff --git a/src/FeaturesAPI/FeaturesAPI_Union.h b/src/FeaturesAPI/FeaturesAPI_Union.h
index 022d14130..de5696385 100644
--- a/src/FeaturesAPI/FeaturesAPI_Union.h
+++ b/src/FeaturesAPI/FeaturesAPI_Union.h
@@ -45,15 +45,17 @@ public:
   FEATURESAPI_EXPORT
   explicit FeaturesAPI_Union(const std::shared_ptr<ModelAPI_Feature>& theFeature,
                              const std::list<ModelHighAPI_Selection>& theBaseObjects,
-                             const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(1.e-8));
+                             const ModelHighAPI_Double& theFuzzy = ModelHighAPI_Double(-1));
 
   /// Destructor.
   FEATURESAPI_EXPORT
   virtual ~FeaturesAPI_Union();
 
-  INTERFACE_2(FeaturesPlugin_Union::ID(),
+  INTERFACE_3(FeaturesPlugin_Union::ID(),
               baseObjects, FeaturesPlugin_Union::BASE_OBJECTS_ID(),
               ModelAPI_AttributeSelectionList, /** Base objects */,
+              useFuzzy, FeaturesPlugin_Union::USE_FUZZY_ID(),
+              ModelAPI_AttributeBoolean, /** Use Fuzzy parameter*/,
               fuzzyParam, FeaturesPlugin_Union::FUZZY_PARAM_ID(),
               ModelAPI_AttributeDouble, /** Fuzzy parameter */)
 
@@ -61,6 +63,10 @@ public:
   FEATURESAPI_EXPORT
   void setBase(const std::list<ModelHighAPI_Selection>& theBaseObjects);
 
+  /// Set use fuzzy parameter.
+  FEATURESAPI_EXPORT
+  void setUseFuzzy(bool theUseFuzzy);
+
   /// Set fuzzy parameter.
   FEATURESAPI_EXPORT
   void setFuzzyValue(const ModelHighAPI_Double& theFuzzy);
@@ -78,7 +84,7 @@ typedef std::shared_ptr<FeaturesAPI_Union> UnionPtr;
 FEATURESAPI_EXPORT
 UnionPtr addUnion(const std::shared_ptr<ModelAPI_Document>& thePart,
                   const std::list<ModelHighAPI_Selection>& theBaseObjects,
-                  const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(1.e-8),
+                  const ModelHighAPI_Double& fuzzyParam = ModelHighAPI_Double(-1),
                   const bool keepSubResults = false);
 
 #endif // FeaturesAPI_Union_H_
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Boolean.cpp b/src/FeaturesPlugin/FeaturesPlugin_Boolean.cpp
index 82f08f182..55e8e3527 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Boolean.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_Boolean.cpp
@@ -21,6 +21,7 @@
 
 #include <ModelAPI_Data.h>
 #include <ModelAPI_Document.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeReference.h>
 #include <ModelAPI_AttributeInteger.h>
@@ -46,6 +47,10 @@
 #include <algorithm>
 #include <map>
 
+
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //=================================================================================================
 FeaturesPlugin_Boolean::FeaturesPlugin_Boolean(const OperationType theOperationType)
 : myOperationType(theOperationType)
@@ -58,11 +63,10 @@ void FeaturesPlugin_Boolean::initAttributes()
   data()->addAttribute(FeaturesPlugin_Boolean::OBJECT_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
   data()->addAttribute(FeaturesPlugin_Boolean::TOOL_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(FeaturesPlugin_Boolean::USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FeaturesPlugin_Boolean::FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), OBJECT_LIST_ID());
   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), TOOL_LIST_ID());
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Boolean.h b/src/FeaturesPlugin/FeaturesPlugin_Boolean.h
index fc88bcbab..24f26b20e 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Boolean.h
+++ b/src/FeaturesPlugin/FeaturesPlugin_Boolean.h
@@ -51,6 +51,13 @@ public:
     return MY_TOOL_LIST_ID;
   }
 
+  /// Attribute name of use fuzzy parameter.
+  inline static const std::string& USE_FUZZY_ID()
+  {
+    static const std::string MY_USE_FUZZY_ID("use_fuzzy");
+    return MY_USE_FUZZY_ID;
+  }
+
   /// Attribute name of fuzzy parameter.
   inline static const std::string& FUZZY_PARAM_ID()
   {
diff --git a/src/FeaturesPlugin/FeaturesPlugin_BooleanCommon.cpp b/src/FeaturesPlugin/FeaturesPlugin_BooleanCommon.cpp
index b3d4e4c53..6d32408d7 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_BooleanCommon.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_BooleanCommon.cpp
@@ -20,6 +20,7 @@
 #include "FeaturesPlugin_BooleanCommon.h"
 
 #include <ModelAPI_ResultBody.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeInteger.h>
 #include <ModelAPI_AttributeSelectionList.h>
@@ -40,6 +41,9 @@
 #include <GeomAlgoAPI_Tools.h>
 
 
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesPlugin_BooleanCommon::FeaturesPlugin_BooleanCommon()
 : FeaturesPlugin_Boolean(FeaturesPlugin_Boolean::BOOL_COMMON)
@@ -54,12 +58,10 @@ void FeaturesPlugin_BooleanCommon::initAttributes()
   data()->addAttribute(OBJECT_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
   data()->addAttribute(TOOL_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   initVersion(BOP_VERSION_9_4(), selectionList(OBJECT_LIST_ID()), selectionList(TOOL_LIST_ID()));
 }
@@ -97,7 +99,9 @@ void FeaturesPlugin_BooleanCommon::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   // version of COMMON feature
   const std::string aCommonVersion = data()->version();
diff --git a/src/FeaturesPlugin/FeaturesPlugin_BooleanCut.cpp b/src/FeaturesPlugin/FeaturesPlugin_BooleanCut.cpp
index 50de25d0c..1aaa84a0f 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_BooleanCut.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_BooleanCut.cpp
@@ -20,6 +20,7 @@
 #include "FeaturesPlugin_BooleanCut.h"
 
 #include <ModelAPI_ResultBody.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeSelectionList.h>
 #include <ModelAPI_Tools.h>
@@ -82,7 +83,9 @@ void FeaturesPlugin_BooleanCut::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   // For solids cut each object with all tools.
   bool isOk = true;
diff --git a/src/FeaturesPlugin/FeaturesPlugin_BooleanFill.cpp b/src/FeaturesPlugin/FeaturesPlugin_BooleanFill.cpp
index 247fd3561..3c1c67d60 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_BooleanFill.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_BooleanFill.cpp
@@ -20,6 +20,7 @@
 #include "FeaturesPlugin_BooleanFill.h"
 
 #include <ModelAPI_ResultBody.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeSelectionList.h>
 #include <ModelAPI_Tools.h>
@@ -93,7 +94,9 @@ void FeaturesPlugin_BooleanFill::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   // For solids cut each object with all tools.
   bool isOk = true;
diff --git a/src/FeaturesPlugin/FeaturesPlugin_BooleanFuse.cpp b/src/FeaturesPlugin/FeaturesPlugin_BooleanFuse.cpp
index a10fead97..5b080a180 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_BooleanFuse.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_BooleanFuse.cpp
@@ -41,6 +41,9 @@
 #include <GeomAPI_ShapeIterator.h>
 
 
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 static void explodeCompound(const GeomShapePtr& theShape, ListOfShape& theResult)
 {
@@ -72,11 +75,10 @@ void FeaturesPlugin_BooleanFuse::initAttributes()
   data()->addAttribute(OBJECT_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
   data()->addAttribute(TOOL_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(FeaturesPlugin_Boolean::USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   data()->addAttribute(REMOVE_INTERSECTION_EDGES_ID(), ModelAPI_AttributeBoolean::typeId());
 
@@ -126,7 +128,9 @@ void FeaturesPlugin_BooleanFuse::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   // version of FUSE feature
   const std::string aFuseVersion = data()->version();
diff --git a/src/FeaturesPlugin/FeaturesPlugin_BooleanSmash.cpp b/src/FeaturesPlugin/FeaturesPlugin_BooleanSmash.cpp
index 9f1aca998..92aff415c 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_BooleanSmash.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_BooleanSmash.cpp
@@ -20,6 +20,7 @@
 #include "FeaturesPlugin_BooleanSmash.h"
 
 #include <ModelAPI_ResultBody.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeSelectionList.h>
 #include <ModelAPI_Tools.h>
@@ -35,6 +36,9 @@
 #include <GeomAPI_ShapeIterator.h>
 
 
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //==================================================================================================
 FeaturesPlugin_BooleanSmash::FeaturesPlugin_BooleanSmash()
 : FeaturesPlugin_Boolean(FeaturesPlugin_Boolean::BOOL_SMASH)
@@ -47,11 +51,10 @@ void FeaturesPlugin_BooleanSmash::initAttributes()
   data()->addAttribute(OBJECT_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
   data()->addAttribute(TOOL_LIST_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   initVersion(BOP_VERSION_9_4(), selectionList(OBJECT_LIST_ID()), selectionList(TOOL_LIST_ID()));
 }
@@ -110,7 +113,9 @@ void FeaturesPlugin_BooleanSmash::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   std::shared_ptr<GeomAlgoAPI_MakeShapeList> aMakeShapeList(new GeomAlgoAPI_MakeShapeList());
   if (!aShapesToAdd.empty()) {
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Intersection.cpp b/src/FeaturesPlugin/FeaturesPlugin_Intersection.cpp
index 42dff80df..e76619bfe 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Intersection.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_Intersection.cpp
@@ -23,6 +23,7 @@
 #include <ModelAPI_Document.h>
 #include <ModelAPI_BodyBuilder.h>
 #include <ModelAPI_ResultBody.h>
+#include <ModelAPI_AttributeBoolean.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeSelectionList.h>
 #include <ModelAPI_Tools.h>
@@ -36,6 +37,8 @@
 
 
 static const std::string INTERSECTION_VERSION_1("v9.5");
+static const double DEFAULT_FUZZY = 1.e-5;
+
 
 //=================================================================================================
 FeaturesPlugin_Intersection::FeaturesPlugin_Intersection()
@@ -48,11 +51,10 @@ void FeaturesPlugin_Intersection::initAttributes()
   AttributePtr anObjectsAttr = data()->addAttribute(OBJECT_LIST_ID(),
                        ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   initVersion(INTERSECTION_VERSION_1, anObjectsAttr, AttributePtr());
 }
@@ -70,7 +72,9 @@ void FeaturesPlugin_Intersection::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   int aResultIndex = 0;
 
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Intersection.h b/src/FeaturesPlugin/FeaturesPlugin_Intersection.h
index 08e3e7a72..67ed1b0a7 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Intersection.h
+++ b/src/FeaturesPlugin/FeaturesPlugin_Intersection.h
@@ -48,6 +48,13 @@ public:
     return MY_OBJECT_LIST_ID;
   }
 
+  /// Attribute name of use fuzzy parameter.
+  inline static const std::string& USE_FUZZY_ID()
+  {
+    static const std::string MY_USE_FUZZY_ID("use_fuzzy");
+    return MY_USE_FUZZY_ID;
+  }
+
   /// Attribute name of fuzzy parameter.
   inline static const std::string& FUZZY_PARAM_ID()
   {
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Partition.cpp b/src/FeaturesPlugin/FeaturesPlugin_Partition.cpp
index 7e1a77c7a..e8788e76a 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Partition.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_Partition.cpp
@@ -50,6 +50,9 @@
 #include <sstream>
 
 
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //=================================================================================================
 FeaturesPlugin_Partition::FeaturesPlugin_Partition()
 {
@@ -60,11 +63,10 @@ void FeaturesPlugin_Partition::initAttributes()
 {
   data()->addAttribute(BASE_OBJECTS_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
   
   initVersion(BOP_VERSION_9_4(), selectionList(BASE_OBJECTS_ID()));
 }
@@ -85,7 +87,9 @@ void FeaturesPlugin_Partition::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   ListOfShape aBaseObjects = anObjects.objects();
   aBaseObjects.insert(aBaseObjects.end(), aPlanes.begin(), aPlanes.end());
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Partition.h b/src/FeaturesPlugin/FeaturesPlugin_Partition.h
index 1448ff724..40f5dc4f3 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Partition.h
+++ b/src/FeaturesPlugin/FeaturesPlugin_Partition.h
@@ -46,6 +46,13 @@ public:
     return MY_BASE_OBJECTS_ID;
   }
 
+  /// Attribute name of use fuzzy parameter.
+  inline static const std::string& USE_FUZZY_ID()
+  {
+    static const std::string MY_USE_FUZZY_ID("use_fuzzy");
+    return MY_USE_FUZZY_ID;
+  }
+
   /// Attribute name of fuzzy parameter.
   inline static const std::string& FUZZY_PARAM_ID()
   {
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Union.cpp b/src/FeaturesPlugin/FeaturesPlugin_Union.cpp
index 9627e7bf0..dcc3f7dde 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Union.cpp
+++ b/src/FeaturesPlugin/FeaturesPlugin_Union.cpp
@@ -29,12 +29,16 @@
 #include <GeomAPI_ShapeExplorer.h>
 #include <GeomAPI_ShapeIterator.h>
 
+#include <ModelAPI_AttributeBoolean.h>>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeSelectionList.h>
 #include <ModelAPI_ResultBody.h>
 #include <ModelAPI_Tools.h>
 
 
+static const double DEFAULT_FUZZY = 1.e-5;
+
+
 //=================================================================================================
 FeaturesPlugin_Union::FeaturesPlugin_Union()
 {
@@ -45,11 +49,10 @@ void FeaturesPlugin_Union::initAttributes()
 {
   data()->addAttribute(BASE_OBJECTS_ID(), ModelAPI_AttributeSelectionList::typeId());
 
+  data()->addAttribute(USE_FUZZY_ID(), ModelAPI_AttributeBoolean::typeId());
   data()->addAttribute(FUZZY_PARAM_ID(), ModelAPI_AttributeDouble::typeId());
-  // Initialize the fuzzy parameter with a value below Precision::Confusion() to indicate,
-  // that the internal algorithms should use their default fuzzy value, if none was specified
-  // by the user.
-  real(FUZZY_PARAM_ID())->setValue(1.e-8);
+  boolean(USE_FUZZY_ID())->setValue(false); // Do NOT use the fuzzy parameter by default.
+  real(FUZZY_PARAM_ID())->setValue(DEFAULT_FUZZY);
 
   initVersion(BOP_VERSION_9_4(), selectionList(BASE_OBJECTS_ID()));
 }
@@ -71,7 +74,9 @@ void FeaturesPlugin_Union::execute()
 
   // Getting fuzzy parameter.
   // Used as additional tolerance to eliminate tiny results.
-  double aFuzzy = real(FUZZY_PARAM_ID())->value();
+  // Using -1 as fuzzy value in the GeomAlgoAPI means to ignore it during the boolean operation!
+  bool aUseFuzzy = boolean(USE_FUZZY_ID())->value();
+  double aFuzzy = (aUseFuzzy ? real(FUZZY_PARAM_ID())->value() : -1);
 
   std::string anError;
   int aResultIndex = 0;
diff --git a/src/FeaturesPlugin/FeaturesPlugin_Union.h b/src/FeaturesPlugin/FeaturesPlugin_Union.h
index 52688310a..8490d0174 100644
--- a/src/FeaturesPlugin/FeaturesPlugin_Union.h
+++ b/src/FeaturesPlugin/FeaturesPlugin_Union.h
@@ -43,6 +43,13 @@ public:
     return MY_BASE_OBJECTS_ID;
   }
 
+  /// Attribute name of use fuzzy parameter.
+  inline static const std::string& USE_FUZZY_ID()
+  {
+    static const std::string MY_USE_FUZZY_ID("use_fuzzy");
+    return MY_USE_FUZZY_ID;
+  }
+
   /// Attribute name of fuzzy parameter.
   inline static const std::string& FUZZY_PARAM_ID()
   {
diff --git a/src/FeaturesPlugin/boolean_common_widget.xml b/src/FeaturesPlugin/boolean_common_widget.xml
index c34682a3d..52d6ca7ea 100644
--- a/src/FeaturesPlugin/boolean_common_widget.xml
+++ b/src/FeaturesPlugin/boolean_common_widget.xml
@@ -38,17 +38,17 @@
       </multi_selector>
     </box>
   </toolbox>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="FeaturesPlugin_ValidatorBooleanCommonArguments"
              parameters="main_objects,tool_objects"/>
 </source>
diff --git a/src/FeaturesPlugin/boolean_fuse_widget.xml b/src/FeaturesPlugin/boolean_fuse_widget.xml
index 1e9635a60..e312f2b49 100644
--- a/src/FeaturesPlugin/boolean_fuse_widget.xml
+++ b/src/FeaturesPlugin/boolean_fuse_widget.xml
@@ -38,17 +38,17 @@
       </multi_selector>
     </box>
   </toolbox>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <boolvalue id="remove_intersection_edges"
            label="Remove intersection edges"
            tooltip="Remove intersection edges if they laying on the same surface"
diff --git a/src/FeaturesPlugin/boolean_smash_widget.xml b/src/FeaturesPlugin/boolean_smash_widget.xml
index c7077ef41..51bf3acf9 100644
--- a/src/FeaturesPlugin/boolean_smash_widget.xml
+++ b/src/FeaturesPlugin/boolean_smash_widget.xml
@@ -19,16 +19,16 @@
     <validator id="PartSet_DifferentObjects"/>
     <validator id="FeaturesPlugin_ValidatorBooleanSmashSelection"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="FeaturesPlugin_ValidatorBooleanArguments" parameters="main_objects,tool_objects"/>
 </source>
diff --git a/src/FeaturesPlugin/boolean_split_widget.xml b/src/FeaturesPlugin/boolean_split_widget.xml
index 7db9399c1..50130dbb9 100644
--- a/src/FeaturesPlugin/boolean_split_widget.xml
+++ b/src/FeaturesPlugin/boolean_split_widget.xml
@@ -19,16 +19,16 @@
     <validator id="PartSet_DifferentObjects"/>
     <validator id="FeaturesPlugin_ValidatorBooleanSelection"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="FeaturesPlugin_ValidatorBooleanArguments" parameters="main_objects,tool_objects"/>
 </source>
diff --git a/src/FeaturesPlugin/boolean_widget.xml b/src/FeaturesPlugin/boolean_widget.xml
index 222e8007e..7967f1775 100644
--- a/src/FeaturesPlugin/boolean_widget.xml
+++ b/src/FeaturesPlugin/boolean_widget.xml
@@ -19,7 +19,7 @@
     <validator id="PartSet_DifferentObjects"/>
     <validator id="FeaturesPlugin_ValidatorBooleanSelection"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
@@ -29,7 +29,7 @@
                   default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="FeaturesPlugin_ValidatorBooleanArguments" parameters="main_objects,tool_objects"/>
   <validator id="GeomValidators_NotSelfIntersected" parameters="main_objects,tool_objects"/>
 </source>
diff --git a/src/FeaturesPlugin/doc/booleanArguments.rst b/src/FeaturesPlugin/doc/booleanArguments.rst
index 1de32398b..68579bdfc 100644
--- a/src/FeaturesPlugin/doc/booleanArguments.rst
+++ b/src/FeaturesPlugin/doc/booleanArguments.rst
@@ -69,7 +69,4 @@ Construction planes (mentioned PLANE) can be used in several operations, but not
 | :ref:`featureUnion`     |                           |                         |
 +-------------------------+---------------------------+-------------------------+
 
-The fuzzy parameter of each boolean operation is used as an additional tolerance to eliminate tiny results.
-
-*Note*: If a value is given, which is smaller than the lowest meaningful tolerance of 1.e-7, the boolean operation
-will use the default internal fuzzy parameter.
+The optional fuzzy parameter of each boolean operation is used as an additional tolerance to eliminate tiny results.
diff --git a/src/FeaturesPlugin/doc/images/Common.png b/src/FeaturesPlugin/doc/images/Common.png
index 0aaf5351e..bacf8c642 100644
Binary files a/src/FeaturesPlugin/doc/images/Common.png and b/src/FeaturesPlugin/doc/images/Common.png differ
diff --git a/src/FeaturesPlugin/doc/images/Cut.png b/src/FeaturesPlugin/doc/images/Cut.png
index d971a74b2..8bb664a18 100644
Binary files a/src/FeaturesPlugin/doc/images/Cut.png and b/src/FeaturesPlugin/doc/images/Cut.png differ
diff --git a/src/FeaturesPlugin/doc/images/Fuse.png b/src/FeaturesPlugin/doc/images/Fuse.png
index bf281ea0b..1572c81d4 100644
Binary files a/src/FeaturesPlugin/doc/images/Fuse.png and b/src/FeaturesPlugin/doc/images/Fuse.png differ
diff --git a/src/FeaturesPlugin/doc/images/Partition.png b/src/FeaturesPlugin/doc/images/Partition.png
index 02499b2b9..8de6a3531 100644
Binary files a/src/FeaturesPlugin/doc/images/Partition.png and b/src/FeaturesPlugin/doc/images/Partition.png differ
diff --git a/src/FeaturesPlugin/doc/images/Smash.png b/src/FeaturesPlugin/doc/images/Smash.png
index 1bcebe216..8b7e8d516 100644
Binary files a/src/FeaturesPlugin/doc/images/Smash.png and b/src/FeaturesPlugin/doc/images/Smash.png differ
diff --git a/src/FeaturesPlugin/doc/images/Split_panel.png b/src/FeaturesPlugin/doc/images/Split_panel.png
index 7d80c5f84..43dd5c81a 100644
Binary files a/src/FeaturesPlugin/doc/images/Split_panel.png and b/src/FeaturesPlugin/doc/images/Split_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/boolean_common_advanced_property_panel.png b/src/FeaturesPlugin/doc/images/boolean_common_advanced_property_panel.png
index 879ea0075..58ae7c34c 100644
Binary files a/src/FeaturesPlugin/doc/images/boolean_common_advanced_property_panel.png and b/src/FeaturesPlugin/doc/images/boolean_common_advanced_property_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/boolean_common_simple_property_panel.png b/src/FeaturesPlugin/doc/images/boolean_common_simple_property_panel.png
index 0a592579c..93efa401a 100644
Binary files a/src/FeaturesPlugin/doc/images/boolean_common_simple_property_panel.png and b/src/FeaturesPlugin/doc/images/boolean_common_simple_property_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/boolean_cut_property_panel.png b/src/FeaturesPlugin/doc/images/boolean_cut_property_panel.png
index 696067fd4..441e1a395 100644
Binary files a/src/FeaturesPlugin/doc/images/boolean_cut_property_panel.png and b/src/FeaturesPlugin/doc/images/boolean_cut_property_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/boolean_fuse_advanced_property_panel.png b/src/FeaturesPlugin/doc/images/boolean_fuse_advanced_property_panel.png
index 4dd19cba0..b1961e5d3 100644
Binary files a/src/FeaturesPlugin/doc/images/boolean_fuse_advanced_property_panel.png and b/src/FeaturesPlugin/doc/images/boolean_fuse_advanced_property_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/boolean_fuse_simple_property_panel.png b/src/FeaturesPlugin/doc/images/boolean_fuse_simple_property_panel.png
index 069eb59da..72f6939d0 100644
Binary files a/src/FeaturesPlugin/doc/images/boolean_fuse_simple_property_panel.png and b/src/FeaturesPlugin/doc/images/boolean_fuse_simple_property_panel.png differ
diff --git a/src/FeaturesPlugin/doc/images/intersection_property_panel.png b/src/FeaturesPlugin/doc/images/intersection_property_panel.png
index b439ac3e4..f497cdd2b 100644
Binary files a/src/FeaturesPlugin/doc/images/intersection_property_panel.png and b/src/FeaturesPlugin/doc/images/intersection_property_panel.png differ
diff --git a/src/FeaturesPlugin/intersection_widget.xml b/src/FeaturesPlugin/intersection_widget.xml
index bafcf1328..6a9c834cb 100644
--- a/src/FeaturesPlugin/intersection_widget.xml
+++ b/src/FeaturesPlugin/intersection_widget.xml
@@ -9,15 +9,15 @@
     <validator id="PartSet_DifferentObjects"/>
     <validator id="FeaturesPlugin_IntersectionSelection"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
 </source>
diff --git a/src/FeaturesPlugin/partition_widget.xml b/src/FeaturesPlugin/partition_widget.xml
index 6a2eda743..a6baaa549 100644
--- a/src/FeaturesPlugin/partition_widget.xml
+++ b/src/FeaturesPlugin/partition_widget.xml
@@ -7,16 +7,16 @@
     clear_in_neutral_point="false">
     <validator id="FeaturesPlugin_ValidatorPartitionSelection" parameters="Plane"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="GeomValidators_MinObjectsSelected" parameters="base_objects,1"/>
 </source>
diff --git a/src/FeaturesPlugin/union_widget.xml b/src/FeaturesPlugin/union_widget.xml
index f8676877b..c5ae191cf 100644
--- a/src/FeaturesPlugin/union_widget.xml
+++ b/src/FeaturesPlugin/union_widget.xml
@@ -7,17 +7,17 @@
     concealment="true">
     <validator id="FeaturesPlugin_ValidatorUnionSelection"/>
   </multi_selector>
-  <groupbox>
+  <optionalbox id="use_fuzzy">
     <doublevalue id="fuzzy_param"
                   label="Fuzzy parameter"
                   tooltip="Additional tolerance to eliminate tiny result."
                   min="1.e-7"
                   max="10"
-                  step="1.e-7"
-                  default="1.e-7">
+                  step="1.e-5"
+                  default="1.e-5">
       <validator id="GeomValidators_Positive"/>
     </doublevalue>
-  </groupbox>
+  </optionalbox>
   <validator id="GeomValidators_MinObjectsSelected" parameters="base_objects,2"/>
   <validator id="FeaturesPlugin_ValidatorUnionArguments"/>
 </source>
diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.cpp b/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.cpp
index 6e3c60df1..8bbbe4dfa 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.cpp
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.cpp
@@ -32,7 +32,7 @@
 GeomAlgoAPI_Boolean::GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
                                          const GeomShapePtr theTool,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy/*= 1.e-8*/)
+                                         const double theFuzzy/*= -1*/)
 {
   ListOfShape aListWithObject, aListWithTool;
   aListWithObject.push_back(theObject);
@@ -44,7 +44,7 @@ GeomAlgoAPI_Boolean::GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
 GeomAlgoAPI_Boolean::GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
                                          const ListOfShape& theTools,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy/*= 1.e-8*/)
+                                         const double theFuzzy/*= -1*/)
 {
   ListOfShape aListWithObject;
   aListWithObject.push_back(theObject);
@@ -55,7 +55,7 @@ GeomAlgoAPI_Boolean::GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
 GeomAlgoAPI_Boolean::GeomAlgoAPI_Boolean(const ListOfShape& theObjects,
                                          const ListOfShape& theTools,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy/*= 1.e-8*/)
+                                         const double theFuzzy/*= -1*/)
 {
   build(theObjects, theTools, theOperationType, theFuzzy);
 }
@@ -116,9 +116,9 @@ void GeomAlgoAPI_Boolean::build(const ListOfShape& theObjects,
   aBuilder->SetRunParallel(bRunParallel);
 
   // Set fuzzy value to eliminate thin results
-  // => Either use the value set by the user (greater or equal than minimum valid value 1.e-7)
+  // => Either use the value set by the user (if positive)
   // => or use the old default value of 1.e-5
-  Standard_Real aFuzzy = (theFuzzy >= 1.e-7 ? theFuzzy : 1.e-5);
+  Standard_Real aFuzzy = (theFuzzy > 0 ? theFuzzy : 1.e-5);
   aBuilder->SetFuzzyValue(aFuzzy);
 
   // Building and getting result.
diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.h b/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.h
index 0182ff054..c5e46c11a 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.h
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_Boolean.h
@@ -38,24 +38,24 @@ public:
   /// \param[in] theTool the tool object.
   /// \param[in] theOperationType type of boolean operation.
   /// \param[in] theFuzzy additional tolerance value.
-  ///            If the fuzzy value is below the minimum tolerance value (1.e-7), the
-  ///            boolean operation will use a default additional tolerance value of 1.e-5.
+  ///            If the fuzzy value is non-positive, the boolean operation will use a default
+  //             additional tolerance value of 1.e-5.
   GEOMALGOAPI_EXPORT GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
                                          const GeomShapePtr theTool,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy = 1.e-8);
+                                         const double theFuzzy = -1);
 
   /// Constructor.
   /// \param[in] theObject the main object.
   /// \param[in] theTools list of tools.
   /// \param[in] theOperationType type of boolean operation.
   /// \param[in] theFuzzy additional tolerance value.
-  ///            If the fuzzy value is below the minimum tolerance value (1.e-7), the
-  ///            boolean operation will use a default additional tolerance value of 1.e-5.
+  ///            If the fuzzy value is non-positive, the boolean operation will use a default
+  //             additional tolerance value of 1.e-5.
   GEOMALGOAPI_EXPORT GeomAlgoAPI_Boolean(const GeomShapePtr theObject,
                                          const ListOfShape& theTools,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy = 1.e-8);
+                                         const double theFuzzy = -1);
 
 
   /// Constructor.
@@ -63,12 +63,12 @@ public:
   /// \param[in] theTools list of tools.
   /// \param[in] theOperationType type of boolean operation.
   /// \param[in] theFuzzy additional tolerance value.
-  ///            If the fuzzy value is below the minimum tolerance value (1.e-7), the
-  ///            boolean operation will use a default additional tolerance value of 1.e-5.
+  ///            If the fuzzy value is non-positive, the boolean operation will use a default
+  //             additional tolerance value of 1.e-5.
   GEOMALGOAPI_EXPORT GeomAlgoAPI_Boolean(const ListOfShape& theObjects,
                                          const ListOfShape& theTools,
                                          const GeomAlgoAPI_Tools::BOPType theOperationType,
-                                         const double theFuzzy = 1.e-8);
+                                         const double theFuzzy = -1);
 
   /// Redefinition of the generic method for the Fuse problem: OCCT 30481
   GEOMALGOAPI_EXPORT virtual void modified(const GeomShapePtr theOldShape,
diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_Intersection.cpp b/src/GeomAlgoAPI/GeomAlgoAPI_Intersection.cpp
index 8ab6a1b07..35942f9bd 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_Intersection.cpp
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_Intersection.cpp
@@ -67,7 +67,7 @@ void GeomAlgoAPI_Intersection::build(const ListOfShape& theObjects, const double
   aDSFiller->SetRunParallel(false);
   aDSFiller->SetNonDestructive(false);
   aDSFiller->SetGlue(BOPAlgo_GlueOff);
-  if (theFuzzy >= 1.e-7) aDSFiller->SetFuzzyValue(theFuzzy);
+  if (theFuzzy > 0) aDSFiller->SetFuzzyValue(theFuzzy);
 
   // optimization for the issue #2399
   BOPAlgo_SectionAttribute theSecAttr(Standard_True,
@@ -83,7 +83,7 @@ void GeomAlgoAPI_Intersection::build(const ListOfShape& theObjects, const double
   anOperation->SetArguments(anObjects);
   anOperation->SetRunParallel(false);
   anOperation->SetCheckInverted(true);
-  if (theFuzzy >= 1.e-7) anOperation->SetFuzzyValue(theFuzzy);
+  if (theFuzzy > 0) anOperation->SetFuzzyValue(theFuzzy);
 
   anOperation->PerformWithFiller(*aDSFiller); // it references a filler fields, so keep the filler
   myFiller = 0;
diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_Partition.cpp b/src/GeomAlgoAPI/GeomAlgoAPI_Partition.cpp
index fe49e167a..dae505c08 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_Partition.cpp
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_Partition.cpp
@@ -202,7 +202,7 @@ void GeomAlgoAPI_Partition::build(const ListOfShape& theObjects,
   Standard_Boolean bRunParallel = Standard_True;
   anOperation->SetRunParallel(bRunParallel);
 
-  if (theFuzzy >= 1.e-7) anOperation->SetFuzzyValue(theFuzzy);
+  if (theFuzzy > 0) anOperation->SetFuzzyValue(theFuzzy);
 
   // Building and getting result.
   anOperation->Perform();
diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_PaveFiller.cpp b/src/GeomAlgoAPI/GeomAlgoAPI_PaveFiller.cpp
index 3801c8064..27af42e71 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_PaveFiller.cpp
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_PaveFiller.cpp
@@ -56,7 +56,7 @@ void GeomAlgoAPI_PaveFiller::build(const ListOfShape& theListOfShape,
     }
   }
   aPaveFiller->SetArguments(aListOfShape);
-  if (theFuzzy >= 1.e-7) aPaveFiller->SetFuzzyValue(theFuzzy);
+  if (theFuzzy > 0) aPaveFiller->SetFuzzyValue(theFuzzy);
   aPaveFiller->Perform();
   if (aPaveFiller->HasErrors())
     return;
@@ -65,7 +65,7 @@ void GeomAlgoAPI_PaveFiller::build(const ListOfShape& theListOfShape,
   this->setImpl(aBuilder);
   this->setBuilderType(OCCT_BOPAlgo_Builder);
   aBuilder->SetArguments(aListOfShape);
-  if (theFuzzy >= 1.e-7) aBuilder->SetFuzzyValue(theFuzzy);
+  if (theFuzzy > 0) aBuilder->SetFuzzyValue(theFuzzy);
   aBuilder->PerformWithFiller(*aPaveFiller);
   if (aBuilder->HasErrors())
     return;