geant events for multiple scattering

src/HEP/Geant/Scene.h

@@ -31,12 +31,15 @@
 #include "Core/Object.h"
 #include "Core/Vector.h"
 #include "Solid.h"
+#include "GeantEvent.h"
 
 class G4VPhysicalVolume;
 
 namespace uLib {
 namespace Geant {
 
+class EmitterPrimary;
+
 class Scene : public Object {
 public:
   Scene();
@@ -46,8 +49,17 @@ public:
   
   void ConstructWorldBox(const ContainerBox *box, const char *material);
 
+  /// Set the primary generator (emitter) for the simulation.
+  /// The Scene does NOT take ownership of the emitter.
+  void SetEmitter(EmitterPrimary *emitter);
+
+  /// Initialize the Geant4 run manager with detector, physics, and action.
   void Initialize();
 
+  /// Run the simulation for nEvents muons.
+  /// Results are appended to the provided vector.
+  void RunSimulation(int nEvents, Vector<GeantEvent> &results);
+
 private:
   class SceneImpl *d;
 };