|Message: Re: Angle distribution from direction cosines||Not Logged In (login)|
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Like Marc, I am surprised by '-'
To complete his answer, let me write the full code to compute spherical angles respective to the World volume frame.
G4ThreeVector direction = track->GetMomentumDirection(); //normalized vector G4double theta = std::acos(direction.z()); G4double phi = std::atan2(direction.y(), direction.x()); // phi in [-pi, +pi[ if (phi < 0.) phi = phi + twopi; // phi in [o, twopi[
(doc: on linux, do : man atan2)
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