# RE: Level of a TGeoNode/TGeoVolume

From: Fine, Valeri <fine_at_bnl.gov>
Date: Wed, 30 Nov 2005 08:28:07 -0500

Hello Christian,
Do you want an equivalent of "TVolumeViewIter::GetDepth()" method ?

I think for TGeo one can use the same idea. One should not pollute the "geometry desciption" class with new and new methodd to satisfy many different needs rather provide the base "geometry iterator" and let the end-user to subclass it "as needed".

Valeri

-----Original Message-----

```	From: owner-roottalk_at_pcroot.cern.ch on behalf of Christian Holm Christensen
Sent: Wed 11/30/2005 7:36 AM
To: Andrei Gheata; ROOT Talk
Cc:
Subject: [ROOT] Level of a TGeoNode/TGeoVolume

Hi there,

Is there a way to get the level (depth) of a given TGeoNode/TGeoVolume
in a geometry?   What I'd like to do is to get the level of some
nodes/volumes and then calculate the relative depth of the
nodes/volumes.   For example

Int_t a_level = gGeoManager->GetLevel("A_1");
Int_t b_level = gGeoManager->GetLevel("B_1");
Int_t depth   = b_level - a_level;

This number `depth' will then be used in a stepping routine in a
simulation (using VMC) to get ID's of parent volumes.

Note, that depending on the actual the geometry, the relative depth may
vary.    For example, you may implement two kinds of geometries:  One
where you do an effective volume, and one where you make a complicated
volume using intersections and so on.   Hence, the depth may not be
known a priori, at least not until the geometry has been closed.

Perhaps something like the attached?

Yours,

--
___  |  Christian Holm Christensen
|_| |  -------------------------------------------------------------
| |  Address: Sankt Hansgade 23, 1. th.  Phone:  (+45) 35 35 96 91
_|           DK-2200 Copenhagen N       Cell:   (+45) 24 61 85 91
_|            Denmark                    Office: (+45) 353  25 404
____|   Email:   cholm_at_nbi.dk               Web:    www.nbi.dk/~cholm
| |

```
Received on Wed Nov 30 2005 - 14:28:43 MET

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