diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index ae2e7d0..d508d22 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/SceneGeom.cpp b/SceneGeom.cpp
index ea0bc15..11cd19b 100644
--- a/SceneGeom.cpp
+++ b/SceneGeom.cpp
@@ -360,24 +360,30 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
          }
         // visualizzazione spilloni
          if ( m_nShowZmap == ZSM_LINES  ||  m_nShowZmap == ZSM_BOTH) {
-            pGraphics->AddColor( BLUE) ;
             POLYLINELIST lstPL ;
-            for ( int i = 0 ; ; ++ i) {
-               bool bOutBreak = false ;
-               for ( int j = 0 ; ; ++ j) {
-                  lstPL.clear() ;
-                  if ( pZmap->GetDexelLines( 1, j, i, lstPL)) {
-                     for ( const auto& PL : lstPL)
-                        pGraphics->AddPolyLine( PL) ; 
-                  }
-                  else {
-                     if ( j == 0)
-                        bOutBreak = true ;
-                     break ;
-                  }
-               } 
-               if ( bOutBreak)
-                  break ;    
+            for ( int k = 0 ; k < 3 ; ++ k) {
+               switch ( k) {
+               default : pGraphics->AddColor( BLUE) ; break ;
+               case 1 : pGraphics->AddColor( RED) ; break ;
+               case 2 : pGraphics->AddColor( GREEN) ; break ;
+               }
+               for ( int i = 0 ; ; ++ i) {
+                  bool bOutBreak = false ;
+                  for ( int j = 0 ; ; ++ j) {
+                     lstPL.clear() ;
+                     if ( pZmap->GetDexelLines( k, j, i, lstPL)) {
+                        for ( const auto& PL : lstPL)
+                           pGraphics->AddPolyLine( PL) ; 
+                     }
+                     else {
+                        if ( j == 0)
+                           bOutBreak = true ;
+                        break ;
+                     }
+                  } 
+                  if ( bOutBreak)
+                     break ;    
+               }
             }
          }
       }