diff --git a/VolZmapCreation.cpp b/VolZmapCreation.cpp
index 1913825..1421676 100644
--- a/VolZmapCreation.cpp
+++ b/VolZmapCreation.cpp
@@ -505,7 +505,7 @@ VolZmap::CreateMapPart( int nMap, int nInfI, int nSupI, int nInfJ, int nSupJ, co
         nSupJ < 0  ||  nSupJ > m_nNy[nMap])
       return false ;
 
-   double dCosSmall = cos( EPS_ANG_SMALL * DEGTORAD) ;
+   double dCosSmall = sin( EPS_ANG_SMALL * DEGTORAD) ;
 
    // Determinazione e ridimensionamento dei dexel interni alla trimesh
    for ( int i = nInfI ; i < nSupI ; ++ i) {
@@ -567,7 +567,7 @@ VolZmap::CreateMapPart( int nMap, int nInfI, int nSupI, int nInfJ, int nSupJ, co
                }
 
                // esco dalla superficie trimesh
-               else if ( dCos > dCosSmall &&  bInside) {
+               else if ( dCos > dCosSmall  &&  bInside) {
 
                   Point3d ptOut = IntersectionResults[k].ptI ;