Geometry

• Introduction
• Solids
  • Constructed Solid Geometry (CSG) Solids
  • Solids made by Boolean operations
  • Multi-Union Structures
  • Tessellated Solids
  • Unified Solids
• Logical Volumes
  • Sub-detector Regions
• Physical Volumes
  • Placements: single positioned copy
  • Repeated volumes
• Touchables: Uniquely Identifying a Volume
  • Introduction to Touchables
  • What can a Touchable do?
  • Touchable history holds stack of geometry data
• Creating an Assembly of Volumes
  • Filling an assembly volume with its “daughters”
  • Assembly volume placement
  • Destruction of an assembly volume
  • Example
• Reflecting Hierarchies of Volumes
• The Geometry Modeller and Optimisation
  • Pre-processing to reduce the time taken by Navigation
  • Using parallelism to reduce the time for geometry initialisation
• The Geometry Navigator
  • Navigation and Tracking
  • Using the navigator to locate points
  • Navigation in parallel geometries
  • Fast navigation in regular patterned geometries and phantoms
  • Run-time commands
  • Setting Geometry Tolerance to be relative
• Converting Geometries from Geant3.21
  • Approach
  • Importing converted geometries into Geant4
  • Current Status
• Detecting Overlapping Volumes
  • The problem of overlapping volumes
• Dynamic Geometry Setups
• Importing XML Models Using GDML
• Importing ASCII Text Models
• Saving geometry tree objects in binary format