No. 104 (00228)

Family name : Tuura
Given name : Lassi
Affiliation : Northeastern University, Boston, USA
Abbreviation : CMS
E-mail address : lassi.tuura@cern.ch
Title : Picking your way through event visualisation: finding the data
Authors : Lassi Tuura, on behalf of CMS experiment
Abstract : 
One of the more difficult parts in visualisation for modern high-energy
experiments is making the data make visual sense to the user.  For one,
there is a lot that could be displayed, much more than can easily be
presented.  The IGUANA project develops visualisation tools for LHC
experiments and thus among many other projects seeks more effective ways
of representing data.  We also seek out means to navigate from object to
object and give visual feedback on object relationships.  This paper
describes our on-going work to help visualisation users nagivate in the
experiment data and organise it for visualisation in effective ways.  We
also cover new tools to apply one object as a visualisation filter on
another object, for instance for grouping purposes (turn off all digis,
not just by individual detector) or to show only the detectors that are
intersected by a selected track.  We describe tools users can use to dig
deeper into the data with various detailed print-outs and tables.  We
present our on-going work to perform custom operations on selected
objects such as "show the invariant mass of the selected tracks" or
"propagate this track to the next surface", and tools to highlight
related objects as the user picks through the data, such as flashing
hits related to the selected track.  We describe how one might navigate
from one object to another for instance in backwards through the
reconstruction chain.