Graphics group report for March 2003
   ------------------------------------

 Since there haven't been any report for the while, this report will cover the
progress in the event displays over several months.


I/ d0ve

 The main problem is still to support the use of multiple monitors in the 
control room. Code that should work in fact crash in the X libraries. A 
significant eefort has been put in trying to understand the problem but no
solution was found. Toby mentioned Qt as apossible alternative but it must be
investigated with care since it implies a complete rewrite of the core package 
of d0ve.

  TO DO:

    - support for multiple screen for the CR

    - investigate using threads to allow for refresh and GUI interaction while
      events are reconstructed.

    - optionally filter events by trigger to show more interesting events
 
    - define default viewpoints for the control display when the layout of 
      monitors is finalized


II/ d0scan 

  The d0scan developpers are still fighting with the gcc conversion. The TGS
OpenInventor libraries for gcc are only available on RedHat 7.3 or newer 
versions. A lot of progress on the port to gcc v3_1 (and qt v3) has been made 
when the build machine was under RedHat 7.3 although there were in the end  
problems with threads in the framework. Since the build machine was reverted 
to RH 7.1 at that time, the problem was not solved. 

  It seems that the only solution for us now is to try an alternative 
OpenInventor library, i.e. Coin which is open source. George and the iguana
people at CERN have been trying to convert iguana to the latest release of 
Coin and found problems that were passed back to the Coin developper. In 
parallel, the current d0scan was compiled and linked with Coin but it seems 
that the threading problem is still with us.

  Anya Maravina and Ana Soldner have joined the d0scan developpers and are 
working on the 2D XY and RZ views. 

  In parallel, the develoment went on with the KCC releases. Here is a brief 
summary of the new features:

   + core code
      - gcc compliance
      - remove references to HEPVis
      - provide a viewer linked with d0scan nodes to view iv file produced by d0scan

   + 3D view
      - add reconstructed electrons
      - change representation for jets/EM/mET to a less invasive one
      - the user can select which cone or kT jets to see
      - L3 tracks
      - L2 jets and EM objects

   + (eta, phi) view
      - rework of the calorimeter display, using new OIV nodes. Bug fixes (crash)
      - implement a "pixel view" were the energy is represented as intensity

   + physics lego
      - L2 jets and EM objects

   + calorimeter lego
      - allows to display negative energy towers, change scale and colors.


 TO DO: 

   - finish the implementation of the XY and RZ views

   - display trigger that passes

   - allow to view all L3 objects in the 3D view

   - update calorimeter display to view cells, in GeV and ADC counts

   - certify the code with oiv v3