Bug in user decay routine leading to segmentation violation corrected.

[u/mrichter/AliRoot.git] / TGeant3 / AliGeant3.cxx

diff --git a/TGeant3/AliGeant3.cxx b/TGeant3/AliGeant3.cxx
index 5b1e3daa18c5ec63d4be5072d5c1597269804e75..ab4919ad3c4c17f2cf0db95cf0bd906938051786 100644 (file)
--- a/TGeant3/AliGeant3.cxx
+++ b/TGeant3/AliGeant3.cxx
@@ -15,6 +15,15 @@
 
 /*
 $Log$
+Revision 1.18  2001/07/19 09:10:23  morsch
+In decays with AliDecayer put long-lived particles undecayed on the stack.
+
+Revision 1.17  2001/06/15 09:31:23  morsch
+In gudcay: write only first generation decay products to stack to respect the possibility of secondary, tertiary, ... vertices during tracking.
+
+Revision 1.16  2001/05/16 14:57:23  alibrary
+New files for folders and Stack
+
 Revision 1.15  2001/03/20 06:28:49  alibrary
 New detector loop split in 2
 
@@ -431,8 +440,8 @@ void gudcay()
 //
     
     TGeant3* geant3=(TGeant3*) gMC;
-  // set decay table
-  gMC->Decayer()->ForceDecay();
+    // set decay table
+    gMC->Decayer()->ForceDecay();
 
 // Initialize 4-momentum vector    
     Int_t ipart = geant3->Gckine()->ipart;
@@ -454,15 +463,41 @@ void gudcay()
 // Fetch Particles
     Int_t np = geant3->Decayer()->ImportParticles(particles);
     if (np <=1) return;
-    
-    for (Int_t i=0; i< np; i++) 
+
+    TParticle *  iparticle = (TParticle *) particles->At(0);
+    Int_t ipF = 0, ipL = 0 ;
+    Int_t i,j;
+
+// Array to flag deselected particles
+    Int_t pFlag[200];
+    for (i=0; i<np; i++) pFlag[i]=0;
+// Particle loop
+    for (i=1; i < np; i++) 
     {
-       TParticle *  iparticle = (TParticle *) particles->At(i);
+       iparticle = (TParticle *) particles->At(i);
+       ipF = iparticle->GetFirstDaughter();
+       ipL = iparticle->GetLastDaughter();     
+       Int_t kf = iparticle->GetPdgCode();
        Int_t ks = iparticle->GetStatusCode();
-// Final state particles only
-       if (ks < 1 || ks >  10) continue;
+//
+// Deselect daughters of deselected particles
+// and jump skip the current particle
+       if (pFlag[i] == 1) {
+           if (ipF >= 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
+           continue;
+       } // deselected ??
+// Particles with long life-time are put on the stack for further tracking
+// Decay products are deselected
+//     
+       if (ks != 1) { 
+           Double_t lifeTime = gMC->Decayer()->GetLifetime(kf);
+           if (lifeTime > (Double_t) 1.e-15) {
+               if (ipF >= 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
+           } else{
+               continue;
+           }
+       } // ks==1 ?
 // Skip neutrinos
-       Int_t  kf=iparticle->GetPdgCode();
        if (kf==12 || kf ==-12) continue;
        if (kf==14 || kf ==-14) continue;
        if (kf==16 || kf ==-16) continue;
@@ -470,7 +505,7 @@ void gudcay()
        Int_t index=geant3->Gcking()->ngkine;
 // Put particle on geant stack
 // momentum vector
-
+       
        (geant3->Gcking()->gkin[index][0]) = iparticle->Px();
        (geant3->Gcking()->gkin[index][1]) = iparticle->Py();
        (geant3->Gcking()->gkin[index][2]) = iparticle->Pz();
@@ -485,7 +520,6 @@ void gudcay()
        (geant3->Gckin3()->gpos[index][2]) = geant3->Gctrak()->vect[2];
 // time of flight offset (mm)
        (geant3->Gcking()->tofd[index])    = 0.;
-//     (geant3->Gcking()->tofd[index])    = iparticle->T()/(10*kSpeedOfLight);
 // increase stack counter
        (geant3->Gcking()->ngkine)=index+1;
     }