This README file shows how to use both the old and new EVE event display for the MUON detector. The explained procedure is a complement to the visualisation of the full ALICE detector discussed on the ALICE Offline page, "Visualisation": http://aliceinfo.cern.ch/Offline/Activities/Visualisation/

The old EVE event display

Macros

Found in $ALICE_ROOT/EVE/macros and $ALICE_ROOT/EVE/macros.

MUON_displaySimu.C , to be used with simulations (shows also reference tracks, Monte-Carlo tracks and hits)
MUON_displayData.C , to be used with reconstructed raw data (with the option SAVEDIGITS in the reconstruction, "simulation" digits are also produced and can be visualized)
alieve_init.C , initialisation of the EVE environment
event_goto.C , navigation in the tree of events
geom_gentle_muon.C , draws a "light" geometry of the MUON detector obtained from the sensitive volumes of all MUON chambers; the default geometry of the event display is made of contours of the chambers extracted from the mapping

Usage

Launch the "alieve" executable
```
alieve
```

Load the following macros (.L macro.C)

alieve_init.C
event_goto.C
MUON_displayData.C
or
MUON_displaySimu.C
geom_gentle_muon.C

Initialize the EVE environment with your data

alieve_init("local://$ALICE_ROOT/OCDB","directory_to_data",event_number)

Display the current event

MUON_displaySimu(0,0)   - do not show tracks
MUON_displaySimu(0,1)   - show tracks
MUON_displaySimu(1,0)   - do not tracks, read digits from produced raw data
MUON_displaySimu(1,1)   - show tracks, read digits from produced raw data
MUON_displayData(1,0)   - do not show tracks
MUON_displayData(1,1)   - show tracks
MUON_displayData(0,0)   - do not show tracks, read the saved digits
MUON_displayData(0,1)   - show tracks, read the saved digits

Draw the "gentle" geometry (sensitive volumes)
```
geom_gentle_muon()
```
Navigate in the event list
```
event_goto(n)
```
Shift + right mouse button one a muon track opens the context menu (track and trigger information is available)
A new flag argument is added to the MUON_display macros for displaying the the clusters taken from the ESD (default), only those attached to the tracks, or from MUONRecPoints, all reconstructed clusters
```
MUON_displaySimu(x,x,1) - clusters from ESD
MUON_displaySimu(x,x,0) - clusters from rec points
MUON_displayData(x,x,1) - clusters from ESD
MUON_displayData(x,x,0) - clusters from rec points
```

The new EVE event display

Macros

Found in $ALICE_ROOT/EVE/macros and $ALICE_ROOT/EVE/macros.

muon_init.C , to launch the new display (based on visscan_init.C)
muon_raw.C , display digits from raw data
muon_digits.C , display digits from MUON.Digits.root file
muon_clusters.C , display clusters from MUON.RecPoints.root file
esd_muon_tracks.C , display tracks, clusters attached to tracks and digits attached to clusters (if any) from ESD
muon_trackRefs.C , display simulated tracks and hits in the MUON chambers
kine_tracks.C , display all the simulated tracks
geom_gentle_muon.C , draws a "light" geometry of the MUON detector obtained from the sensitive volumes of all MUON chambers; the default geometry of the event display is made of contours of the chambers extracted from the mapping

Usage

Launch the "alieve" executable
```
alieve
```
Initialize the EVE environment with the path to the OCDB and your data.
1. Reading data locally:
```
.x muon_init.C("local://$ALICE_ROOT/OCDB","directory_to_data")
```
2. Reading data on the grid (link to corresponding raw data is made automatically):
```
.x muon_init.C("raw://","alien:///alice/data/2009/LHC09c/000084039/ESDs/pass1/09000084039008.10")
```
Change what to draw:
Just enable/disable the corresponding macros in the tab "DataSelection" by clicking on the macro name and checking the box "Active"
Navigate in the event list:
Just use the buttons or choose the event number in the bottom panel. You can also scan the events by checking the box "Autoload" and change the time between 2 drawing.
Leave the cursor on a track to pop-up its characteristics

The simplified "gentle" geometry for the event display

Execute from aliroot the macro MUONGenerateGentleGeometry.C and place the resulting file in EVE/alice-data. This file is used by the macro geom_gentle_muon.C from EVE/macros.

This chapter is defined in the READMEeve.txt file.