Re: Few questions

 Hi Kirill,

 Find below completed Andrei's answer together  with answers to your other questions.

> > Hello
> > I'm looking for the possibility to draw tracks just after or during
> > transport using VMC. I guess i need to take some actions in StepManager to
> > do that. I only know how to do that if TGeoManager is active. So the
> > question is which methods of TVirtualMC are useful to do the task?

On Thu, 30 Jun 2005, Andrei Gheata wrote:
> For the first part: as far as I know, the option is available only with TGeo:
> you have to gompile G3 with -DCOLLECT_TRACKS, then you will have all tracks
> collected by TGeoManager.

 Drawing tracks is not interfaced via VMC;  in case of Geant3, you can use directly TGeo as Andrei explained above;  in case of Geant4 you can use Geant4 visualization.  Recently, the demonstration of drawing tracks has been added to  the E02 VMC example.

> > Next, it would be nice to have somewhere preferably in TVirtualMC itself the
> > description of the meaning of all flags like IsTrackStop()

 I agree.
 Currently the detailed documentation is provided in the implementation  files (*.cxx) for each MC and so it is not so easy to find.  I had already the same idea but I haven't found time to do it ...  

> > And the last how to check which physics process killed the track?
> >

 TVirtualMC::StepProcess() function fills the integer array  with all physics process that happened during the particle  step; if particle was stopped the last process in the array should  be that responsible of stopping the particle.

 Best regards,

 Ivana

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