diff --git a/VolZmapCreation.cpp b/VolZmapCreation.cpp
index f1a7a80..07f6f16 100644
--- a/VolZmapCreation.cpp
+++ b/VolZmapCreation.cpp
@@ -788,6 +788,11 @@ VolZmap::SubtractMapPart( int nMap, int nInfI, int nSupI, int nInfJ, int nSupJ,
 bool
 VolZmap::CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex, double dExtraBox)
 {
+
+#if false
+   #define MULTITHREAD
+#endif
+
   // Se la superficie non è chiusa oppure orientata al contrario non ha senso continuare
    double dVol ;
    if ( ! Surf.IsClosed()  ||  ! Surf.GetVolume( dVol)  ||  dVol < 0)
@@ -804,7 +809,7 @@ VolZmap::CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex
   // quindi espandiamo il bounding box per ovviare al problema.
    if ( dExtraBox > EPS_ZERO)
       SurfBBox.Expand( dExtraBox) ;
-
+    
   // Determino i punti estremi del bounding box
    Point3d ptMapOrig, ptMapEnd ; 
    SurfBBox.GetMinMax( ptMapOrig, ptMapEnd) ;
@@ -870,6 +875,8 @@ VolZmap::CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex
      // Oggetto per calcolo massivo intersezioni
       IntersParLinesSurfTm intPLSTM( frMapFrame, Surf) ;
 
+#ifdef MULTITHREAD
+
       // Numero massimo di thread
       int nThreadMax = max( 1, int( thread::hardware_concurrency()) - 1) ;
       vector< future<bool>> vRes ;
@@ -910,15 +917,22 @@ VolZmap::CreateFromTriMesh( const ISurfTriMesh& Surf, double dStep, bool bTriDex
             }
          }
       }
+#endif
+
+#ifndef MULTITHREAD
+      // debug ///// NON multiTHREAD
+      CreateMapPart( nG, 0, m_nNx[nG], 0, m_nNy[nG], vtLen, ptMapOrig, Surf, intPLSTM) ;
+      // debug
+#endif
    }
 
   // Assegno il minimo e massimo valore di Z della mappa
-   m_dMinZ[0] = 0 ;
-   m_dMaxZ[0] = vtLen.z ;
-   m_dMinZ[1] = 0 ;
-   m_dMaxZ[1] = ( bTriDex ? vtLen.x : 0) ;
-   m_dMinZ[2] = 0 ;  
-   m_dMaxZ[2] = ( bTriDex ? vtLen.y : 0) ;
+   m_dMinZ[0] = dExtraBox ;
+   m_dMaxZ[0] = vtLen.z - dExtraBox ;
+   m_dMinZ[1] = dExtraBox ;
+   m_dMaxZ[1] = ( bTriDex ? vtLen.x - dExtraBox : 0) ;
+   m_dMinZ[2] = dExtraBox ;  
+   m_dMaxZ[2] = ( bTriDex ? vtLen.y - dExtraBox : 0) ;
 
   // Tipologia
    m_nShape = ( dExtraBox > EPS_ZERO && IsBox() ? BOX : GENERIC) ;