Update StEvent structs for StFttPoint StFttCluster and update StFttFa…

…stSimMaker (#698)

1. Updates StEvent containers for Ftt data (clusters and points) to
include idTruth (mirror FST and FCS)
2. Update StFttFastSimMaker to copy Ftt GEANT hits to StFttCollection as
StFttPoints

The Fast sim just copies GEANT hits from front modules and writes them
into the StFttCollection as StFttPoints (skips the entire reco chain).
The "slow" sim (still WIP) will write clusters and therefore idTruth is
needed there.
Removed old code based on square modules (RnD geometry) and different
strip layout. This also simplifies the Fwd tracking because it no longer
needs to read directly from GEANT

StRoot/StEvent/StFttCluster.h

@@ -27,6 +27,7 @@ class StFttCluster : public StObject {
     float sumAdc() const;
     float x() const;  // Mean x ("center of gravity") in local grid coordinate (1st moment).
     float sigma() const; // Maximum 2nd moment (along major axis).
+    UShort_t idTruth() const { return mIdTruth; } // Get the truth ID
 
     void setId(int cluid);
     void setPlane(UChar_t plane);
@@ -37,6 +38,7 @@ class StFttCluster : public StObject {
     void setSumAdc(int theSumAdc);
     void setX(float x0);
     void setSigma(float sigma);
+    void setIdTruth(UShort_t id) { mIdTruth = id; }
 
     StPtrVecFttRawHit& rawHits();
     const StPtrVecFttRawHit& rawHits() const;
@@ -62,8 +64,9 @@ class StFttCluster : public StObject {
     StPtrVecFttRawHit mRawHits;            // Tower hits of the current cluster
     StPtrVecFttCluster mNeighbors;    // Neighbor clusters
     StPtrVecFttPoint mPoints;        // Fitted points (photons) in the cluster
+    UShort_t mIdTruth=0; // Truth ID
 
-    ClassDef(StFttCluster, 2)
+    ClassDef(StFttCluster, 3)
 };
 
 std::ostream& operator << ( std::ostream&, const StFttCluster& clu ); // Printing operator

StRoot/StEvent/StFttPoint.h

@@ -31,14 +31,15 @@ class StFttPoint : public StObject {
     int nClusters() const; // Number of points in the parent cluster.
     StFttCluster* cluster( size_t i); //  Parent cluster of the photon.
     const StThreeVectorD& xyz() const; // XYZ position in global STAR coordinate
+    UShort_t idTruth() const { return mIdTruth; } // Get the truth ID
 
     void setPlane(UChar_t plane);
     void setQuadrant(UChar_t quad);
     void setX(float x);
     void setY(float y);
     void addCluster(StFttCluster* cluster, UChar_t dir);
     void setXYZ(const StThreeVectorD& p3);
-
+    void setIdTruth(UShort_t id) { mIdTruth = id; }
 
     void print(int option=0);
 
@@ -49,8 +50,9 @@ class StFttPoint : public StObject {
     Float_t  mY=0.0;         // y-position in local coordinate
     StFttCluster *mClusters[4];
     StThreeVectorD  mXYZ;    // Photon position in STAR coordinate
+    UShort_t mIdTruth=0; // Truth ID
 
-    ClassDef(StFttPoint, 1)
+    ClassDef(StFttPoint, 2)
 };
 
 inline UChar_t StFttPoint::plane() const { return mPlane; }