diff --git a/EGkCAvSimpleSurfFrMove.h b/EGkCAvSimpleSurfFrMove.h
index 8a0978e..5b1be44 100644
--- a/EGkCAvSimpleSurfFrMove.h
+++ b/EGkCAvSimpleSurfFrMove.h
@@ -35,20 +35,27 @@ const int SCI_LINE_LINE = 4 ;             // tra linea di mobile e linea di fiss
 struct SCollInfo
 {
    int nType ;                    // tipo di collisione
+
    int nChunkM ;                  // indice del chunk della regione mobile
-   int nCrvM ;                    // indice della curva nel loop esterno del chunk
+   int nLoopM ;                   // indice del loop del chunk della regione mobile
+   int nCrvM ;                    // indice della curva nel loop del chunk
+
    int nChunkF ;                  // indice del chunk della regione fissa
-   int nCrvF ;                    // indice della curva nel loop esterno del chunk
+   int nLoopF ;                   // indice del loop del chunk della regione fissa
+   int nCrvF ;                    // indice della curva nel loop del chunk
+
    Point3d ptP1 ;                 // punto di contatto
    Point3d ptP2 ;                 // se contatto linea-linea, secondo punto di contatto
    Vector3d vtDirM ;              // se contatto del mobile con linea, sua direzione
    Vector3d vtDirF ;              // se contatto del fisso con linea, sua direzione
+
    // costruttori
-   SCollInfo() : nType( SCI_NONE), nChunkM( -1), nCrvM( -1), nChunkF( -1), nCrvF( -1),
+   SCollInfo() : nType( SCI_NONE), nChunkM( -1), nLoopM( -1), nCrvM( -1), nChunkF( -1), nLoopF( -1), nCrvF( -1),
                  ptP1(), ptP2(), vtDirM(), vtDirF() {}
-   SCollInfo( const SCollInfo& Sou) : nType( Sou.nType), nChunkM( Sou.nChunkM), nCrvM( Sou.nCrvM),
-                                      nChunkF( Sou.nChunkF), nCrvF( Sou.nCrvF), ptP1( Sou.ptP1),
-                                      ptP2( Sou.ptP2), vtDirM( Sou.vtDirM), vtDirF( Sou.vtDirF) {} 
+   SCollInfo( const SCollInfo& Sou) : nType( Sou.nType),
+                                      nChunkM( Sou.nChunkM), nLoopM( Sou.nLoopM), nCrvM( Sou.nCrvM),
+                                      nChunkF( Sou.nChunkF), nLoopF( Sou.nLoopF), nCrvF( Sou.nCrvF),
+                                      ptP1( Sou.ptP1), ptP2( Sou.ptP2), vtDirM( Sou.vtDirM), vtDirF( Sou.vtDirF) {}
 } ;
 
 //----------------------------------------------------------------------------
@@ -67,4 +74,4 @@ class CAvSimpleSurfFrMove
       const ISurfFlatRegion* m_pRegM ;
       const ISurfFlatRegion* m_pRegF ;
       SCollInfo m_SCollInfo ;
-} ;
\ No newline at end of file
+} ;
diff --git a/EGkCAvSurfFrMove.h b/EGkCAvSurfFrMove.h
new file mode 100644
index 0000000..586c901
--- /dev/null
+++ b/EGkCAvSurfFrMove.h
@@ -0,0 +1,41 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2015-2018
+//----------------------------------------------------------------------------
+// File : EGkCAvSurfFrMove.h      Data : 26.03.2026    Versione : 3.1c7
+// Contenuto : Dichiarazione classe per movimento di superfici flat region
+//             nel loro piano evitando collisioni
+//
+// Modifiche : 26.03.26 RE Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkCAvSimpleSurfFrMove.h"
+
+//----------------------- Macro per import/export ----------------------------
+#undef EGK_EXPORT
+#if defined( I_AM_EGK)            // da definirsi solo nella DLL
+   #define EGK_EXPORT __declspec( dllexport)
+#else
+   #define EGK_EXPORT __declspec( dllimport)
+#endif
+
+//----------------------------------------------------------------------------
+class CAvSurfFrMove
+{
+   public :
+      EGK_EXPORT CAvSurfFrMove( const ISurfFlatRegion& SfrM, const ISurfFlatRegion& SfrF) ;
+
+   public :
+      EGK_EXPORT bool Translate( const Vector3d& vtDir, double& dLen) ;
+      EGK_EXPORT bool Rotate( const Point3d& ptCen, double& dAng) ;
+      EGK_EXPORT const SCollInfo& GetCollInfo()
+                           { return m_CollInfo ; }
+
+   private :
+      const ISurfFlatRegion* m_pRegM ;
+      const ISurfFlatRegion* m_pRegF ;
+      SCollInfo m_CollInfo ;
+} ;
diff --git a/EGkSurfFlatRegion.h b/EGkSurfFlatRegion.h
index 6842148..bb11f61 100644
--- a/EGkSurfFlatRegion.h
+++ b/EGkSurfFlatRegion.h
@@ -52,7 +52,8 @@ class __declspec( novtable) ISurfFlatRegion : public ISurf
       virtual bool GetChunkCentroid( int nChunk, Point3d& ptCen) const = 0 ;
       virtual bool GetChunkArea( int nChunk, double& dArea) const = 0 ;
       virtual bool GetChunkPerimeter( int nChunk, double& dLen) const = 0 ;
-      virtual int  GetChunkSimpleClassification( int nChunk, const ISurfFlatRegion& Other, int nOthChunk) const ;   // compare only outsides
+      virtual int  GetChunkSimpleClassification( int nChunk, const ISurfFlatRegion& Other, int nOthChunk) const = 0 ;   // compare only outsides
+      virtual bool CheckChunkInterference( int nChunk, const ISurfFlatRegion& Other, int nOthChunk, bool& bInterference) const = 0 ;
       virtual bool GetChunkMaxOffset( int nChunk, double& dOffs) const = 0 ;
       virtual int  GetLoopCount( int nChunk) const = 0 ;
       virtual int  GetLoopCurveCount( int nChunk, int nLoop) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 58edd70..086b938 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -808,6 +808,7 @@ EXE_EXPORT bool ExeSurfFrChunkMaxOffset( int nId, int nChunk, double& dMaxOffset
 EXE_EXPORT bool ExeSurfFrTestExternal( int nId1, int nId2, double dMinDist) ;
 EXE_EXPORT int  ExeSurfFrChunkCount( int nId) ;
 EXE_EXPORT int  ExeSurfFrChunkSimpleClassify( int nId1, int nChunk1, int nId2, int nChunk2, double dToler = 0) ;
+EXE_EXPORT int  ExeSurfFlatRegionInterference( int nId1, int nChunk1, int nId2, int nChunk2, double dToler = 0) ;
 EXE_EXPORT bool ExeSurfFrChunkCenter( int nId, int nChunk, int nRefId, Point3d& ptCen, Vector3d& vtN) ;
 EXE_EXPORT int  ExeExtractSurfFrChunkLoops( int nId, int nChunk, int nDestGrpId, int* pnCount) ;
 EXE_EXPORT int  ExeSurfFrGetZigZagInfill( int nId, int nDestGrpId, double dStep, double dAng, bool bSmooth, int* pnCount) ;