diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index b345b63..7610b3c 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/EgtGeomKernel.vcxproj b/EgtGeomKernel.vcxproj
index 365f077..467e55d 100644
--- a/EgtGeomKernel.vcxproj
+++ b/EgtGeomKernel.vcxproj
@@ -107,7 +107,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_WINDOWS;I_AM_EGK;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <OpenMPSupport>true</OpenMPSupport>
+      <OpenMPSupport>false</OpenMPSupport>
       <CompileAs>CompileAsCpp</CompileAs>
       <MinimalRebuild>false</MinimalRebuild>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -142,7 +142,7 @@ copy $(TargetPath) \EgtProg\DllD32</Command>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_WINDOWS;I_AM_EGK;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <OpenMPSupport>true</OpenMPSupport>
+      <OpenMPSupport>false</OpenMPSupport>
       <CompileAs>CompileAsCpp</CompileAs>
       <MinimalRebuild>false</MinimalRebuild>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -177,7 +177,7 @@ copy $(TargetPath) \EgtProg\DllD64</Command>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;_WINDOWS;I_AM_EGK;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <OpenMPSupport>true</OpenMPSupport>
+      <OpenMPSupport>false</OpenMPSupport>
       <CompileAs>CompileAsCpp</CompileAs>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
@@ -224,7 +224,7 @@ copy $(TargetPath) \EgtProg\Dll32</Command>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;_WINDOWS;I_AM_EGK;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <OpenMPSupport>true</OpenMPSupport>
+      <OpenMPSupport>false</OpenMPSupport>
       <CompileAs>CompileAsCpp</CompileAs>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
diff --git a/VolZmap.h b/VolZmap.h
index 8ff8690..3686bc3 100644
--- a/VolZmap.h
+++ b/VolZmap.h
@@ -19,6 +19,7 @@
 #include "/EgtDev/Include/EGkVolZmap.h"
 #include <unordered_map>
 #include <stack>
+#include <mutex>
 
 // ------------------------- STRUTTURE -----------------------------------------------------------
 struct AppliedVector {
@@ -402,6 +403,7 @@ class VolZmap : public IVolZmap, public IGeoObjRW
       mutable std::vector<InterVoxMatter> m_SliceXY ;
       mutable std::vector<InterVoxMatter> m_SliceXZ ;
       mutable std::vector<InterVoxMatter> m_SliceYZ ;
+      mutable std::mutex SliceMutex ;
 
       Tool m_Tool ;
 } ;
diff --git a/VolZmapGraphics.cpp b/VolZmapGraphics.cpp
index 0f49276..26a7b21 100644
--- a/VolZmapGraphics.cpp
+++ b/VolZmapGraphics.cpp
@@ -24,6 +24,8 @@
 #include "/EgtDev/Include/EgtNumUtils.h"
 #include "/EgtDev/Extern/Eigen/Core"
 #include "/EgtDev/Extern/Eigen/SVD"
+#include <thread>
+#include <future>
 
 using namespace std ;
 
@@ -916,11 +918,25 @@ VolZmap::UpdateTripleMapGraphics( void) const
    }
 
   // Calcolo i triangoli sui blocchi
-   for ( int t = 0 ; t < m_nNumBlock ; ++ t) {
+   int nBlockUpdated = 0 ;
+   vector< future<bool>> vRes ;
+   vRes.resize( m_nNumBlock) ;
+   for ( int i = 0 ; i < m_nNumBlock ; ++ i) {
      // Se il blocco deve essere processato
-      if ( m_BlockToUpdate[t]) {
+      if ( m_BlockToUpdate[i]) {
         // processo ...
-         ExtMarchingCubes( int( t), vVoxContainerVec[t]) ;
+         ++ nBlockUpdated ;
+         vRes[i] = async( launch::async, &VolZmap::ExtMarchingCubes, this, i, ref( vVoxContainerVec[i])) ;
+      }
+   }
+   bool bOk = true ;
+   int nTerminated = 0 ;
+   while ( nTerminated < nBlockUpdated) {
+      for ( int i = 0 ; i < m_nNumBlock ; ++ i) {
+         if ( m_BlockToUpdate[i]  &&  vRes[i].valid()  &&  vRes[i].wait_for( chrono::microseconds{ 1 }) == future_status::ready) {
+            bOk = vRes[i].get()  &&  bOk ;
+            ++ nTerminated ;
+         }
       }
    }
 
@@ -1205,11 +1221,13 @@ VolZmap::ExtMarchingCubes( int nBlock, VoxelContainer& vVox) const
                         bDefTopology = true ;
                      }
                      if ( GetBlockNFromIJK( nSlBlockIJK, nSlBlockN)) {
+                        SliceMutex.lock() ;
                         auto it = m_SliceYZ[nSlBlockN].find( nSliceN) ;
                         if ( it != m_SliceYZ[nSlBlockN].end()) {
                            bMatOnSlice = it->second ;
                            bDefTopology = true ;
                         }
+                        SliceMutex.unlock() ;
                      }
                   }
                   else if ( abs( nAdjVox3[nCount]) == 2) {
@@ -1219,11 +1237,13 @@ VolZmap::ExtMarchingCubes( int nBlock, VoxelContainer& vVox) const
                         bDefTopology = true ;
                      }
                      if ( GetBlockNFromIJK( nSlBlockIJK, nSlBlockN)) {
+                        SliceMutex.lock() ;
                         auto it = m_SliceXZ[nSlBlockN].find( nSliceN) ;
                         if ( it != m_SliceXZ[nSlBlockN].end()) {
                            bMatOnSlice = it->second ;
                            bDefTopology = true ;
                         }
+                        SliceMutex.unlock() ;
                      }
                   }
                   else if ( abs( nAdjVox3[nCount]) == 3) {
@@ -1233,11 +1253,13 @@ VolZmap::ExtMarchingCubes( int nBlock, VoxelContainer& vVox) const
                         bDefTopology = true ;
                      }
                      if ( GetBlockNFromIJK( nSlBlockIJK, nSlBlockN)) {
+                        SliceMutex.lock() ;
                         auto it = m_SliceXY[nSlBlockN].find( nSliceN) ;
                         if ( it != m_SliceXY[nSlBlockN].end()) {
                            bMatOnSlice = it->second ;
                            bDefTopology = true ;
                         }
+                        SliceMutex.unlock() ;
                      }
                   }
                }
@@ -1301,20 +1323,29 @@ VolZmap::ExtMarchingCubes( int nBlock, VoxelContainer& vVox) const
                   if ( abs(nAdjVox3[nCount]) == 1) {
                      if ( nSlBlockN == nBlock)
                         SliceYZ.emplace( nSliceN, bMatOnSlice) ;
-                     else
+                     else {
+                        SliceMutex.lock() ;
                         m_SliceYZ[nSlBlockN].emplace( nSliceN, bMatOnSlice) ;
+                        SliceMutex.unlock() ;
+                     }
                   }
                   else if ( abs(nAdjVox3[nCount]) == 2) {
                      if ( nSlBlockN == nBlock)
                         SliceXZ.emplace( nSliceN, bMatOnSlice) ;
-                     else
+                     else {
+                        SliceMutex.lock() ;
                         m_SliceXZ[nSlBlockN].emplace( nSliceN, bMatOnSlice) ;
+                        SliceMutex.unlock() ;
+                     }
                   }
                   else if ( abs(nAdjVox3[nCount]) == 3) {
                      if ( nSlBlockN == nBlock)
                         SliceXY.emplace(nSliceN, bMatOnSlice) ;
-                     else
+                     else {
+                        SliceMutex.lock();
                         m_SliceXY[nSlBlockN].emplace( nSliceN, bMatOnSlice) ;
+                        SliceMutex.unlock() ;
+                     }
                   }
                }