diff --git a/EXE_GdbGetCurve.cpp b/EXE_GdbGetCurve.cpp
index df7f2c3..ffc188d 100644
--- a/EXE_GdbGetCurve.cpp
+++ b/EXE_GdbGetCurve.cpp
@@ -60,6 +60,21 @@ ExeCurveLength( int nId, double* pdLen)
    return ( pCurve != nullptr  &&  pCurve->GetLength( *pdLen)) ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeCurveLengthAtParam( int nId, double dPar, double* pdLen)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // verifico il parametro
+   if ( pdLen == nullptr)
+      return false ;
+  // recupero la curva
+   ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
+  // recupero la lunghezza
+   return ( pCurve != nullptr  &&  pCurve->GetLengthAtParam( dPar, *pdLen)) ;
+}
+
 //----------------------------------------------------------------------------
 bool
 ExeCurveParamAtLength( int nId, double dLen, double* pdPar)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index c44c7be..7c53ece 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbGetCurve.cpp b/LUA_GdbGetCurve.cpp
index f46bed8..d779ee5 100644
--- a/LUA_GdbGetCurve.cpp
+++ b/LUA_GdbGetCurve.cpp
@@ -57,6 +57,25 @@ LuaCurveLength( lua_State* L)
    return 1 ;
 }
 
+//----------------------------------------------------------------------------
+static int
+LuaCurveLengthAtParam( lua_State* L)
+{
+  // 2 parametri : Id, dPar
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   double dPar ;
+   LuaCheckParam( L, 2, dPar) ;
+   LuaClearStack( L) ;
+  // recupero la lunghezza della curva
+   double dLen ;
+   if ( ExeCurveLengthAtParam( nId, dPar, &dLen))
+      LuaSetParam( L, dLen) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaCurveParamAtLength( lua_State* L)
@@ -594,6 +613,7 @@ LuaInstallGdbGetCurve( LuaMgr& luaMgr)
    bool bOk = ( &luaMgr != nullptr) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveDomain", LuaCurveDomain) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveLength", LuaCurveLength) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtCurveLengthAtParam", LuaCurveLengthAtParam) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveParamAtLength", LuaCurveParamAtLength) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveParamAtPoint", LuaCurveParamAtPoint) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCurveIsClosed", LuaCurveIsClosed) ;