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Forum: Processes Involving Optical Photons
Re: None 2 problems that may be related
Re: Note Updated, one problem resolved.
Date: 16 Jun, 2009
From: Gumplinger Peter <Gumplinger Peter>

My guess is that you have this line somewhere in your code:


The trap is that the pointer:


is NULL when the/any track exists the world-volume. You cannot use it to get the name of the volume "beyond the world" unless you protect the code as in:

if (aStep->GetPostStepPoint()->GetPhysicalVolume()) {
  fVolumeName = aStep->GetPostStepPoint()->GetPhysicalVolume()->GetName();

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