diff --git a/SurfBezier.cpp b/SurfBezier.cpp
index 79687d2..6ddb279 100644
--- a/SurfBezier.cpp
+++ b/SurfBezier.cpp
@@ -1509,7 +1509,8 @@ SurfBezier::GetAuxSurf( void) const
       Point3d ptMax = std::get<1>( vTrees[i]) ;
       Tree.SetSurf( this, true, ptMin, ptMax) ;
       //Tree.BuildTree_test() ;        // per debug
-      Tree.BuildTree( 5 * LIN_TOL_FINE, 1) ;
+      //Tree.BuildTree( 5 * LIN_TOL_FINE, 1) ;
+      Tree.BuildTree( LIN_TOL_FINE, 0.1) ;
       Tree.GetPolygons( vvPL) ;
       //Tree.GetPolygonsBasic( vPL) ;  // per usare i polygon basic
    }
@@ -1572,7 +1573,8 @@ SurfBezier::GetLeaves( std::vector<std::tuple<int, Point3d, Point3d>>& vLeaves)
       Point3d ptMax = std::get<1>( vTrees[i]) ;
       Tree.SetSurf( this, true, ptMin, ptMax) ;
       //Tree.BuildTree_test() ;
-      Tree.BuildTree( 5 * LIN_TOL_FINE, 1) ;
+      //Tree.BuildTree( 5 * LIN_TOL_FINE, 1) ;
+      Tree.BuildTree( LIN_TOL_FINE, 0.1) ;
       Tree.GetLeaves( vCells) ;
       for (int k = 0 ; k < (int)vCells.size(); ++ k ) {
          std::tuple<int, Point3d, Point3d> tCell ;