diff --git a/EGkPoint3d.h b/EGkPoint3d.h
index 2e3dcce..3d23f4c 100644
--- a/EGkPoint3d.h
+++ b/EGkPoint3d.h
@@ -42,6 +42,9 @@ class EGK_EXPORT Point3d
       void Set( double dX, double dY, double dZ) { x = dX ; y = dY ; z = dZ ;}
 
    public :
+      //! Verifica la validità delle coordinate del punto
+      bool IsValid( void) const
+             { return ( std::isfinite( x)  &&  std::isfinite( y)  &&  std::isfinite( z)) ; }
       //! Verifica se il punto è quasi l'origine
       bool IsSmall( void) const
              { return ( ( x * x + y * y + z * z) < SQ_EPS_SMALL) ; }
diff --git a/EGkVector3d.h b/EGkVector3d.h
index dc25701..a4f0f69 100644
--- a/EGkVector3d.h
+++ b/EGkVector3d.h
@@ -44,6 +44,9 @@ class EGK_EXPORT Vector3d
       void Set( double dX, double dY, double dZ) { x = dX ; y = dY ; z = dZ ; }
 
    public :
+      //! Verifica la validità delle coordinate del vettore
+      bool IsValid( void) const
+             { return ( std::isfinite( x)  &&  std::isfinite( y)  &&  std::isfinite( z)) ; }
       //! Quadrato della lunghezza del vettore
       double SqLen( void) const
              { return ( x * x + y * y + z * z) ; }