diff --git a/SceneBasic.cpp b/SceneBasic.cpp
index cd42f07..39c060d 100644
--- a/SceneBasic.cpp
+++ b/SceneBasic.cpp
@@ -26,6 +26,7 @@ using namespace std ;
 
 //--------------------------- Constants --------------------------------------
 static const double MIN_EXTENSION = 50 ;
+static const double MIN_W_H = 0.01 ;
 static const double MIN_ZCLIP_EXT = 5000 ;
 
 
@@ -413,6 +414,10 @@ Scene::AdjustDimView( double dHalfWidth, double dHalfHeight)
       }
    }
 
+  // verifico minimo delle dimensioni
+   dHalfWidth = max( dHalfWidth, MIN_W_H) ;
+   dHalfHeight = max( dHalfHeight, MIN_W_H) ;
+
   // adatto il rapporto tra le dimensioni calcolate a quello delle dimensioni della vista
    double dAspect = m_nViewportH / ( double) m_nViewportW ;
    if ( dAspect * dHalfWidth > dHalfHeight) {