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Requirements

• Should be at least as functional as existing systems (org.lcsim, GEAR, mocha, SLIC)
• Shoule enable smooth transition path from existing systems
• Should encourage interoperability between systems

Implementation Ideas

• Three levels of API?
  • Low level (equivalent to Geant4 geometry objects)
    • Initially dumb objects, sufficient to create Geant4 geometry
  • Medium level (similar to GEAR::Vertex::API)
  • High level (allows finding which detectors exist)

...

• have collection of driver classes
  • one subdetector level
  • gcj comliant Java ( to be called from C++/Marlin)
  • read in 'free format' from parameters from xml elements
    • should probably be similar to compact/gear
• create queue of geometry instructions
  • logical volumes
  • physical volumes
  • placements
  • material
  • etc

points to cover

• GEAR++ interface deifinition (mediun level)

• material database
• field maps
• properties (sampling fractions)
• dE/dX
• readout properties
  • cellId <-> position
  • cellid range (noise simulation)
  • cell sizes
  • neighbors