add detector simulation

src/HEP/Geant/Solid.h

@@ -106,6 +106,8 @@ class BoxSolid : public Solid {
 public:
   BoxSolid(const char *name, ContainerBox *box);
   virtual G4VSolid* GetG4Solid() const override { return (G4VSolid*)m_Solid; }
+  
+  ContainerBox* GetObject() const { return m_Object; }
 
 public slots:
   void Update();