[ALICE3] Update FT3 geometry

- wrap layers into air volumes
- solve visualization issues

Author: njacazio

Detectors/Upgrades/ALICE3/FT3/base/include/FT3Base/GeometryTGeo.h

@@ -101,9 +101,6 @@ class GeometryTGeo : public o2::itsmft::GeometryTGeo
   static const char* composeSymNameSensor(Int_t d, Int_t lr);
 
  protected:
-  static constexpr int MAXLAYERS = 15; ///< max number of active layers
-
-  Int_t mNumberOfLayers;               ///< number of layers
   static std::string sInnerVolumeName; ///< Mother inner volume name
   static std::string sVolumeName;      ///< Mother volume name
   static std::string sLayerName;       ///< Layer name

Detectors/Upgrades/ALICE3/FT3/simulation/include/FT3Simulation/Detector.h

@@ -25,7 +25,6 @@
 #include "TGeoManager.h"                      // for gGeoManager, TGeoManager (ptr only)
 #include "TLorentzVector.h"                   // for TLorentzVector
 #include "TVector3.h"                         // for TVector3
-#include "FT3Base/FT3BaseParam.h"
 
 class FairVolume;
 class TGeoVolume;
@@ -34,25 +33,10 @@ class TParticle;
 
 class TString;
 
-namespace o2
-{
-namespace ft3
+namespace o2::ft3
 {
 class GeometryTGeo;
-}
-} // namespace o2
-namespace o2
-{
-namespace ft3
-{
-class FT3Layer;
-}
-} // namespace o2
-
-namespace o2
-{
-namespace ft3
-{
+class FT3BaseParam;
 class FT3Layer;
 
 class Detector : public o2::base::DetImpl<Detector>
@@ -108,8 +92,16 @@ class Detector : public o2::base::DetImpl<Detector>
   void PostTrack() override { ; }
   void PreTrack() override { ; }
 
+  static constexpr int IdxForwardDisks = 0;
+  static constexpr int IdxBackwardDisks = 1;
   /// Returns the number of layers
-  Int_t getNumberOfLayers() const { return mNumberOfLayers; }
+  size_t getNumberOfLayers() const
+  {
+    if (mLayerName[IdxBackwardDisks].size() != mLayerName[IdxForwardDisks].size()) {
+      LOG(fatal) << "Number of layers in the two directions are different! Returning 0.";
+    }
+    return mLayerName[IdxBackwardDisks].size();
+  }
 
   void buildBasicFT3(const FT3BaseParam& param);
   void buildFT3V1();
@@ -119,14 +111,11 @@ class Detector : public o2::base::DetImpl<Detector>
   void buildFT3ScopingV3();
   void buildFT3FromFile(std::string);
 
-  GeometryTGeo* mGeometryTGeo; //! access to geometry details
-
   void exportLayout();
 
  protected:
   std::vector<Int_t> mLayerID;
-  std::vector<std::vector<TString>> mLayerName;
-  Int_t mNumberOfLayers;
+  std::array<std::vector<TString>, 2> mLayerName; // Two sets of layer names, one per direction (forward/backward)
 
  private:
   /// this is transient data about track passing the sensor
@@ -154,16 +143,15 @@ class Detector : public o2::base::DetImpl<Detector>
 
   Detector& operator=(const Detector&);
 
-  std::vector<std::vector<FT3Layer>> mLayers;
-  bool mIsPipeActivated = true; //! If Alice 3 pipe is present append inner disks to vacuum volume to avoid overlaps
+  std::array<std::vector<FT3Layer>, 2> mLayers; // Two sets of layers, one per direction (forward/backward)
+  bool mIsPipeActivated = true;                 //! If Alice 3 pipe is present append inner disks to vacuum volume to avoid overlaps
 
   template <typename Det>
   friend class o2::base::DetImpl;
   ClassDefOverride(Detector, 1);
 };
 
-} // namespace ft3
-} // namespace o2
+} // namespace o2::ft3
 
 #ifdef USESHM
 namespace o2

Detectors/Upgrades/ALICE3/FT3/simulation/include/FT3Simulation/FT3Layer.h

@@ -36,7 +36,7 @@ class FT3Layer : public TObject
   FT3Layer() = default;
 
   // Sample layer constructor
-  FT3Layer(Int_t layerDirection, Int_t layerNumber, std::string layerName, Float_t z, Float_t rIn, Float_t rOut, Float_t Layerx2X0);
+  FT3Layer(Int_t layerDirection, Int_t layerNumber, std::string layerName, Float_t z, Float_t rIn, Float_t rOut, Float_t Layerx2X0, bool partOfMiddleLayers);
 
   /// Copy constructor
   FT3Layer(const FT3Layer&) = default;
@@ -51,6 +51,7 @@ class FT3Layer : public TObject
   auto getInnerRadius() const { return mInnerRadius; }
   auto getOuterRadius() const { return mOuterRadius; }
   auto getDirection() const { return mDirection; }
+  bool getIsInMiddleLayer() const { return mIsMiddleLayer; }
   auto getZ() const { return mZ; }
   auto getx2X0() const { return mx2X0; }
 
@@ -77,14 +78,15 @@ class FT3Layer : public TObject
   static TGeoMedium* medFoam;
 
  private:
-  Int_t mLayerNumber = -1; ///< Current layer number
-  Int_t mDirection;        ///< Layer direction 0=Forward 1 = Backward
-  std::string mLayerName;  ///< Current layer name
-  Double_t mInnerRadius;   ///< Inner radius of this layer
-  Double_t mOuterRadius;   ///< Outer radius of this layer
-  Double_t mZ;             ///< Z position of the layer
-  Double_t mChipThickness; ///< Chip thickness
-  Double_t mx2X0;          ///< Layer material budget x/X0
+  Int_t mLayerNumber = -1;    ///< Current layer number
+  Int_t mDirection;           ///< Layer direction 0=Forward 1 = Backward
+  bool mIsMiddleLayer = true; ///< Wether this layer is part of the middle layers
+  std::string mLayerName;     ///< Current layer name
+  Double_t mInnerRadius;      ///< Inner radius of this layer
+  Double_t mOuterRadius;      ///< Outer radius of this layer
+  Double_t mZ;                ///< Z position of the layer
+  Double_t mChipThickness;    ///< Chip thickness
+  Double_t mx2X0;             ///< Layer material budget x/X0
 
   ClassDefOverride(FT3Layer, 0); // ALICE 3 EndCaps geometry
 };