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Question Scored the wrong angle, really bad thing 

Forum: Biasing and Scoring
Date: 16 Nov, 2014
From: Geng <Geng>

Dear experts,
I am doing a simulation with Geant4.10.p03.
I tried to score the particle angles emitted from the upper side of a box.
I am using the following code to judge the surface from the upper side of a box.
   if (aStep->GetPostStepPoint()->GetStepStatus() == fGeomBoundary ){
    // Exiting Geometry
    G4ThreeVector stppos2= aStep->GetPostStepPoint()->GetPosition();
    G4ThreeVector localpos2 = 
    if(std::fabs( localpos2.z() + boxSolid->GetZHalfLength())<kCarTolerance ){
      return fCurrent_Out;
and, using the following to get the angle. 
Angle=(aStep->GetPostStepPoint()-> GetMomentumDirection().z())/degree;

In my personal sense, the angels should distribute in the range of 90-180 degree, however, the strange thing is, there is a lot of the angles are much less than 90 degree?

I cannot figure out where I am wrong, so, could anyone give me some suggestions?

Thanks and best regards. Geng

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1 Ok: Re: Scored the wrong angle, really bad thing   (Geng - 16 Nov, 2014)
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