Tsld017

  • Volume description and Navigator are intertwined

  • Navigator’s performance is steady

    • retaining its edge over Geant-3 in tests

  • Touchables

    • pack full volume location information
    • are used in tracking

Tsld016

  • New Parameterised Volumes

    • allowing different solids

  • Boolean operations between solids

  • Magnetic field

    • using safety to speed it up
    • spin tracking

Tsld015

  • Permanent, unlike “live” volume tree.

  • Full geometrical information available

    • to sensitive detectors
    • to hits

  • Is there an alternative?

    • what is the minimum information that is needed ?

Tsld014

  • CERN School of Computing ‘94 honeycomb calorimeter

  • Does adding it to a track create a performance penalty?

    • At first a big one
    • Now improved

  • Geantinos are worst case

    • no physics!

  • Tracking optimisation will start now

Tsld013

  • It can reply to these queries:

    • where are you (rotation, position)
    • what is your shape (solid)

  • Some types of touchable also know

    • their physical volume
    • their replication number
    • how to “turn into” their mother volumes
      • they know their place in volume hierarchy

Tsld010

  • Time in seconds

    • for 10,000 iterations
    • each of 3 directions

  • Almost no changes in code executed between 0.5 & a02

    • yet can find 10% +/-
    • cause: different linking, due to code not run?

Tsld011

  • Integration of BREP solids

    • and reading of STEP files.

  • Propagation in Magnetic Field

  • Development of Transportation Process

    • as a new “generalised process”

  • Touchable used in track/step

    • replacing physical volume pointer
    • performance issues drove re-implementation of touchable used.

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