Allow to place and rotate a detctor using CbmSetup

Add a member function to pass a TGeoHMatrix to the geometry module.
In case the matrix is present in the module the information is used to
place the geometry when creating the detector.

sim/transport/steer/CbmSetup.cxx

@@ -180,6 +180,23 @@ void CbmSetup::SetActive(ECbmModuleId moduleId, Bool_t active)
 }
 // -------------------------------------------------------------------------
 
+// -----   Set the placement matrix of a detector   -----------------------------
+void CbmSetup::SetMatrix(ECbmModuleId moduleId, TGeoHMatrix matrix)
+{
+
+  auto& moduleMap = fProvider->GetSetup().GetModuleMap();
+
+  // Check presence of module in current setup
+  if (moduleMap.find(moduleId) == moduleMap.end()) {
+    LOG(warn) << "Module " << moduleId << " does not exist in setup!";
+    return;
+  }
+
+  // Set activity flag
+  moduleMap.at(moduleId).SetMatrix(matrix);
+}
+// -------------------------------------------------------------------------
+
 
 // -----   Set the field map   ---------------------------------------------
 void CbmSetup::SetField(const char* tag, Double_t scale, Double_t xPos, Double_t yPos, Double_t zPos)

sim/transport/steer/CbmSetup.h

@@ -19,6 +19,7 @@
 
 #include <Logger.h>
 
+#include "TGeoMatrix.h"
 #include "TNamed.h"
 #include "TString.h"
 #include "TVector3.h"
@@ -140,6 +141,12 @@ public:
      **/
   void SetActive(ECbmModuleId moduleId, Bool_t active = kTRUE);
 
+  /** Set a placemnet matrix for a module (detector)
+     ** @param moduleId  Module identifier. SystemId for detectors, or kMagnet, kPipe, kTarget
+     ** @param matrix    TGeoHMatrix to place the detector at construction
+     **
+     **/
+  void SetMatrix(ECbmModuleId moduleId, TGeoHMatrix matrix);
 
   /** Set the magnetic field map
      ** @param tag   Field map tag