|Message: Re: How to get translation vector of a physical volume w.r.t global origin||Not Logged In (login)|
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If one has a step point inside a physical volume, say
G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint();
in the end of the current step, it is possible to find a transformation relative to the global (world volume) frame using touchable. Below is one example showing how to calculate the distance to outside of a volume fEnvelope ('position' and 'directionTR' are global position and direction from tracking):
const G4RotationMatrix* rotM = pPostStepPoint->GetTouchable()-> GetRotation(); G4ThreeVector transl = pPostStepPoint->GetTouchable()->GetTranslation(); G4AffineTransform transform = G4AffineTransform(rotM,transl); transform.Invert(); G4ThreeVector localP = transform.TransformPoint(position); G4ThreeVector localV = transform.TransformAxis(directionTR); G4double distance = fEnvelope->GetSolid()->DistanceToOut(localP, localV);
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