Generating Primary Events

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Hello every one,

I have a problem to generate Primary events. I would like to generate a gamma ray toward the center of my detector (it is a box) and vary the initial position of the gamma ray. To do this, I use spherical coordinates:

x=r*sin(theta)*cos(phi); y=r*sin(theta)*sin(phi); z=r*cos(theta); and vary the theta and phi angles. Here is my program:

void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
     G4int theta, phi, l, n;
     theta=phi=l=n=0;
     G4float r = 10.0; // in cm.

     for( n=0; n<3; n++ )
     {
       for( l=0; l<3; l++ )
	 {

	   // n = anEvent->GetEventID()% 3;

		 //G4cout << " an Event " << n << G4endl;
		theta=60*n;
		phi=120*l;

		G4int i = anEvent->GetEventID();
		  G4cout << " an Event " << i << G4endl;

		G4cout << " Theta  " << theta << " Phi " << phi << G4endl;

		particleGun->SetParticlePosition(G4ThreeVector(r*(sin(theta*deg)*cos(phi*deg))*cm,
                        (r*sin(theta*deg)*sin(phi*deg))*cm,(r*cos(theta*deg))*cm));

		particleGun->SetParticleMomentumDirection(G4ThreeVector(-(sin(theta*deg)*cos(phi*deg)), 
                        -(sin(theta*deg)*sin(phi*deg)),-(cos(theta*deg))));

		particleGun->GeneratePrimaryVertex(anEvent);	
	 }
     }        
 }

Here is what I get:

an Event 1
 Theta  0 Phi 0
 an Event 1
 Theta  0 Phi 120
 an Event 1
 Theta  0 Phi 240
 an Event 1
 Theta  60 Phi 0
 an Event 1
 Theta  60 Phi 120
 an Event 1
 Theta  60 Phi 240
 an Event 1
 Theta  120 Phi 0
 an Event 1
 Theta  120 Phi 120
 an Event 1
 Theta  120 Phi 2 an Event 4
 Theta  0 Phi 0
 an Event 4
 Theta  0 Phi 120
 an Event 4
 Theta  0 Phi 240
 an Event 4
 Theta  60 Phi 0
 an Event 4
 Theta  60 Phi 120
 an Event 4
 Theta  60 Phi 240
 an Event 4
 Theta  120 Phi 0
 an Event 4
 Theta  120 Phi 120
 an Event 4
 Theta  120 Phi 240
 an Event 5
 Theta  0 Phi 0
 an Event 5
 Theta  0 Phi 120
 an Event 5
 Theta  0 Phi 240
 an Event 5
 Theta  60 Phi 0
 an Event 5
 Theta  60 Phi 120
 an Event 5
 Theta  60 Phi 240
 an Event 5
 Theta  120 Phi 0
 an Event 5
 Theta  120 Phi 120
 an Event 5
 Theta  120 Phi 240
 an Event 6
 Theta  0 Phi 0
 an Event 6
 Theta  0 Phi 120
 an Event 6
 Theta  0 Phi 240
 an Event 6
 Theta  60 Phi 0
 an Event 6
 Theta  60 Phi 120
 an Event 6
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 6
 Theta  120 Phi 120
 an Event 6
 Theta  120 Phi 240
 an Event 7
 Theta  0 Phi 0
 an Event 7
 Theta  0 Phi 120
 an Event 7
 Theta  0 Phi 240
 an Event 7
 Theta  60 Phi 0
 an Event 7
 Theta  60 Phi 120
 an Event 7
 Theta  60 Phi 240
 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 240

 Theta  120 Phi 120
 an Event 5
 Theta  120 Phi 240
 an Event 6
 Theta  0 Phi 0
 an Event 6
 Theta  0 Phi 120
 an Event 6
 Theta  0 Phi 240
 an Event 6
 Theta  60 Phi 0
 an Event 6
 Theta  60 Phi 120
 an Event 6
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 6
 Theta  120 Phi 120
 an Event 6
 Theta  120 Phi 240
 an Event 7
 Theta  0 Phi 0
 an Event 7
 Theta  0 Phi 120
 an Event 7
 Theta  0 Phi 240
 an Event 7
 Theta  60 Phi 0
 an Event 7
 Theta  60 Phi 120
 an Event 7
 Theta  60 Phi 240
 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 240

 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 24040
 an Event 2
 Theta  0 Phi 0
 an Event 2
 Theta  0 Phi 120
 an Event 2
 Theta  0 Phi 240
 an Event 2
 Theta  60 Phi 0
 an Event 2
 Theta  60 Phi 120
 an Event 2
 Theta  60 Phi 240
 an Event 2
 Theta  120 Phi 0
 an Event 2
 Theta  120 Phi 120
 an Event 2
 Theta  120 Phi 240
 an Event 3
 Theta  0 Phi 0
 an Event 3
 Theta  0 Phi 120
 an Event 3
 Theta  0 Phi 240
 an Event 3
 Theta  60 Phi 0
 an Event 3
 Theta  60 Phi 120
 an Event 3
 Theta  60 Phi 240
 an Event 3
 Theta  120 Phi 0
 an Event 3
 Theta  120 Phi 120
 an Event 3
 Theta  120 Phi 240
 an Event 4
 Theta  0 Phi 0
 an Event 4
 Theta  0 Phi 120
 an Event 4
 Theta  0 Phi 240
 an Event 4
 Theta  60 Phi 0
 an Event 4
 Theta  60 Phi 120
 an Event 4
 Theta  60 Phi 240
 an Event 4
 Theta  120 Phi 0
 an Event 4
 Theta  120 Phi 120
 an Event 4
 Theta  120 Phi 240
 an Event 5
 Theta  0 Phi 0
 an Event 5
 Theta  0 Phi 120
 an Event 5
 Theta  0 Phi 240
 an Event 5
 Theta  60 Phi 0
 an Event 5
 Theta  60 Phi 120
 an Event 5
 Theta  60 Phi 240
 an Event 5
 Theta  120 Phi 0
 an Event 5
 Theta  120 Phi 120
 an Event 5
 Theta  120 Phi 240
 an Event 6
 Theta  0 Phi 0
 an Event 6
 Theta  0 Phi 120
 an Event 6
 Theta  0 Phi 240
 an Event 6
 Theta  60 Phi 0
 an Event 6
 Theta  60 Phi 120
 an Event 6
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 6
 Theta  120 Phi 120
 an Event 6
 Theta  120 Phi 240
 an Event 7
 Theta  0 Phi 0
 an Event 7
 Theta  0 Phi 120
 an Event 7
 Theta  0 Phi 240
 an Event 7
 Theta  60 Phi 0
 an Event 7
 Theta  60 Phi 120
 an Event 7
 Theta  60 Phi 240an Event 1
 Theta  0 Phi 0
 an Event 1
 Theta  0 Phi 120
 an Event 1
 Theta  0 Phi 240
 an Event 1
 Theta  60 Phi 0
 an Event 1
 Theta  60 Phi 120
 an Event 1
 Theta  60 Phi 240
 an Event 1
 Theta  120 Phi 0
 an Event 1
 Theta  120 Phi 120
 an Event 1
 Theta  120 Phi 240
 an Event 2
 Theta  0 Phi 0
 an Event 2
 Theta  0 Phi 120
 an Event 2
 Theta  0 Phi 240
 an Event 2
 Theta  60 Phi 0
 an Event 2
 Theta  60 Phi 120
 an Event 2
 Theta  60 Phi 24 an Event 4
 Theta  0 Phi 0
 an Event 4
 Theta  0 Phi 120
 an Event 4
 Theta  0 Phi 240
 an Event 4
 Theta  60 Phi 0
 an Event 4
 Theta  60 Phi 120
 an Event 4
 Theta  60 Phi 240
 an Event 4
 Theta  120 Phi 0
 an Event 4
 Theta  120 Phi 120
 an Event 4
 Theta  120 Phi 240
 an Event 5
 Theta  0 Phi 0
 an Event 5
 Theta  0 Phi 120
 an Event 5
 Theta  0 Phi 240
 an Event 5
 Theta  60 Phi 0
 an Event 5
 Theta  60 Phi 120
 an Event 5
 Theta  60 Phi 240
 an Event 5
 Theta  120 Phi 0
 an Event 5
 Theta  120 Phi 120
 an Event 5
 Theta  120 Phi 240
 an Event 6
 Theta  0 Phi 0
 an Event 6
 Theta  0 Phi 120
 an Event 6
 Theta  0 Phi 240
 an Event 6
 Theta  60 Phi 0
 an Event 6
 Theta  60 Phi 120
 an Event 6
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 6
 Theta  120 Phi 120
 an Event 6
 Theta  120 Phi 240
 an Event 7
 Theta  0 Phi 0
 an Event 7
 Theta  0 Phi 120
 an Event 7
 Theta  0 Phi 240
 an Event 7
 Theta  60 Phi 0
 an Event 7
 Theta  60 Phi 120
 an Event 7
 Theta  60 Phi 240
 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 240

 Theta  120 Phi 120
 an Event 5
 Theta  120 Phi 240
 an Event 6
 Theta  0 Phi 0
 an Event 6
 Theta  0 Phi 120
 an Event 6
 Theta  0 Phi 240
 an Event 6
 Theta  60 Phi 0
 an Event 6
 Theta  60 Phi 120
 an Event 6
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 6
 Theta  120 Phi 120
 an Event 6
 Theta  120 Phi 240
 an Event 7
 Theta  0 Phi 0
 an Event 7
 Theta  0 Phi 120
 an Event 7
 Theta  0 Phi 240
 an Event 7
 Theta  60 Phi 0
 an Event 7
 Theta  60 Phi 120
 an Event 7
 Theta  60 Phi 240
 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 240

 an Event 7
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 7
 Theta  120 Phi 240
 an Event 8
 Theta  0 Phi 0
 an Event 8
 Theta  0 Phi 120
 an Event 8
 Theta  0 Phi 240
 an Event 8
 Theta  60 Phi 0
 an Event 8
 Theta  60 Phi 120
 an Event 8
 Theta  60 Phi 240
 an Event 8
 Theta  120 Phi 0
 an Event 8
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 2400
 an Event 2
 Theta  120 Phi 0
 an Event 2
 Theta  120 Phi 120
 an Event 2
 Theta  120 Phi 240
 an Event 3
 Theta  0 Phi 0
 an Event 3
 Theta  0 Phi 120
 an Event 3
 Theta  0 Phi 240
 an Event 3
 Theta  60 Phi 0
 an Event 3
 Theta  60 Phi 120
 an Event 3
 Theta  60 Phi 240
 an Event 3
 Theta  120 Phi 0
 an Event 3
 Theta  120 Phi 120
 an Event 3
 Theta  120 Phi 240
 an Event 4
 Theta  0 Phi 0
 an Event 4
 Theta  0 Phi 120
 an Event 4
 Theta  0 Phi 240
 an Event 4
 Theta  60 Phi 0
 an Event 4
 Theta  60 Phi 120
 an Event 4
 Theta  60 Phi 240
 an Event 4
 Theta  120 Phi 0
 an Event 4
 Theta  120 Phi 120
 an Event 4
 Theta  120 Phi 240
 an Event 5
 Theta  0 Phi 0
 an Event 5
 Theta  0 Phi 120
 an Event 5
 Theta  0 Phi 240
 an Event 5
 Theta  60 Phi 0
 an Event 5
 Theta  60 Phi 120
 an Event 5
 Theta  60 Phi 240
 an Event 5
 Theta  120 Phi 0
 an Event 5an Event 1
 Theta  0 Phi 0
 an Event 1
 Theta  0 Phi 120
 an Event 1
 Theta  0 Phi 240
 an Event 1
 Theta  60 Phi 0
 an Event 1
 Theta  60 Phi 120
 an Event 1
 Theta  60 Phi 240
 an Event 1
 Theta  120 Phi 0
 an Event 1
 Theta  120 Phi 120
 an Event 1
 Theta  120 Phi 240
 an Event 2
 Theta  0 Phi 0
 an Event 2
 Theta  0 Phi 120
 an Event 2
 Theta  0 Phi 240
 an Event 2
 Theta  60 Phi 0
 an Event 2
 Theta  60 Phi 120
 an Event 2
 Theta  60 Phi 240
 an Event 2
 Theta  120 Phi 0
 an Event 2
 Theta  120 Phi 120
 an Event 2
 Theta  120 Phi 240
 an Event 3
 Theta  0 Phi 0
 an Event 3
 Theta  0 Phi 120
 an Event 3
 Theta  0 Phi 240
 an Event 3
 Theta  60 Phi 0
 an Event 3
 Theta  60 Phi 120
 an Event 3
 Theta  60 Phi 240
 an Event 3
 Theta  120 Phi 0
 an Event 3
 Theta  120 Phi 120
 an Event 3
 Theta  120 Phi 240

Here is what I want:

an Event 0
 Theta  0 Phi 0
 an Event 1
 Theta  0 Phi 120
 an Event 2
 Theta  0 Phi 240
 an Event 3
 Theta  60 Phi 0
 an Event 4
 Theta  60 Phi 120
 an Event 5
 Theta  60 Phi 240
 an Event 6
 Theta  120 Phi 0
 an Event 7
 Theta  120 Phi 120
 an Event 8
 Theta  120 Phi 240

Can you please help to find the solution? Thank you

Suzanne