diff --git a/API_GdbGetSurf.cpp b/API_GdbGetSurf.cpp
index 4bcc3f2..7fb70c4 100644
--- a/API_GdbGetSurf.cpp
+++ b/API_GdbGetSurf.cpp
@@ -19,6 +19,34 @@
 
 using namespace std ;
 
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfArea( int nId, double* pdArea)
+{
+   if ( pdArea == nullptr)
+      return FALSE ;
+  // recupero l'area
+   return ( ExeSurfArea( nId, *pdArea) ? TRUE : FALSE) ;
+}
+
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfIsClosed( int nId)
+{
+  // verifico se superficie è chiusa (definisce un volume interno)
+   return ( ExeSurfIsClosed( nId) ? TRUE : FALSE) ;
+}
+
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfVolume( int nId, double* pdVol)
+{
+   if ( pdVol == nullptr)
+      return FALSE ;
+  // recupero il volume (se superficie chiusa)
+   return ( ExeSurfVolume( nId, *pdVol) ? TRUE : FALSE) ;
+}
+
 //----------------------------------------------------------------------------
 BOOL
 __stdcall EgtSurfFrNormVersor( int nId, int nRefId, double vtNorm[3])
@@ -63,6 +91,13 @@ __stdcall EgtExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int*
    return ExeExtractSurfFrChunkLoops( nId, nChunk, nDestGrpId, pnCount) ;
 }
 
+//----------------------------------------------------------------------------
+int
+__stdcall EgtSurfTmPartCount( int nId)
+{
+   return ExeSurfTmPartCount( nId) ;
+}
+
 //----------------------------------------------------------------------------
 int
 __stdcall EgtSurfTmFacetCount( int nId)
diff --git a/EgtInterface.rc b/EgtInterface.rc
index 02952d7..bf0a6a3 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ