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GEOM – Status and developments. Andrei Gheata, Mihaela Gheata ROOT 2005. Outline. Package functionality New shapes Assemblies of volumes New developments for navigation I/O improvements Graphics To-do list. Package functionality. Geometry model description

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geom status and developments

GEOM – Status and developments

Andrei Gheata, Mihaela Gheata

ROOT 2005

GEOM – Status and developments

  • Package functionality
  • New shapes
  • Assemblies of volumes
  • New developments for navigation
  • I/O improvements
  • Graphics
  • To-do list

GEOM – Status and developments

package functionality
Package functionality
  • Geometry model description
    • Independent on simulation code
  • Navigation functionality
    • Interfaced with transport MC’s via VMC (simulation)
      • GEANT3 – in production, available in ROOT repository
      • GEANT4 – navigation interface under development
        • Preliminary version expected by end ’05
      • FLUKA – Geometry interface validated against FLUKA examples, available in AliRoot repository
        • Consolidation for latest FLUKA release ongoing
    • API usable by track propagation algorithms (reconstruction)
  • Geometry checking tools
    • Overlap checking
    • Raytracing + other built-in checking methods testing how tracking works in a given setup
  • Visualization
    • Event display
      • Support for objects like: tracks, hits, digits, clusters will be soon added at TViewer3D level

GEOM – Status and developments

  • Currently: 21 basic shapes implemented
    • “Basic” = implements all TGeoShape functionality for navigation and visualization
  • Additions: TGeoHype, TGeoHalfSpace
    • Hyperboloids defined by: inner/outer minimum radii and stereo angles, half-length in Z
    • Half-spaces defined by: a point (x, y, z) and the normal vector in this point (nx, ny, nz) pointing outside the half space
      • To be used ONLY in the definition of composites

GEOM – Status and developments

scaled shapes
Scaled shapes
  • Possibility to scale geometry requested by users
    • Not many use cases for hierarchical scaling
      • Except enlarging/shrinking uniformly a structure
      • Hard to implement navigation in general case (non-conservation of distances)
    • More useful and easy to implement at shape level
  • Scaled shapes available in October release

GEOM – Status and developments

volume assemblies







Volume assemblies
  • Union of several different volumes positioned with respect to a common local frame
    • An assembly is just a volume having no shape container
      • No medium/material needed: a point INSIDE the assembly is always in one of the components
    • The assembly provides a logical grouping used not only during geometry creation phase, but also to optimize navigation (TGeoShapeAssembly)
      • Provides a way to create an additional hierarchical level in a flat structure of objects WITHOUT defining a physical container

Overlap !

GEOM – Status and developments

usage of assemblies
Usage of assemblies
  • Easy creation using TGeoVolume interface
    • TGeoVolume *vol = new TGeoVolumeAssembly(name);
    • vol->AddNode(pVol1, id, pMatrix);
    • Same constrains as for volumes (no overlaps of components) except extrusion
  • Very useful for defining complex structures where is hard to define a container made of a basic shape
    • Nesting allowed
    • No navigation performance penalty
  • Example of usage in: $ROOTSYS/tutorials/assembly.C
    • Description in release notes

GEOM – Status and developments






  • Consistent behavior when track is crossing boundaries
    • Boundary tolerance implemented in DistFromInside/DistFromOuside shape algorithms
  • New navigation method
    • TGeoManager::FindNextBoundaryAndStep
    • Consistent “ON boundary” flagging
  • Several minor fixes and improvements

GEOM – Status and developments

  • TGeoManager::Export(“geom.root”)
    • .root I/O
    • Minor fixes since last workshop
  • TGeoManager::Export(“geom.C”)
    • Exports geometry as a C++ file
    • Algorithmic part of geometry building lost, but very useful for developing new geometry code from existing geometry
    • Saving just a part of the geometry possible
      • TGeoVolume::SaveAs(“volume.C”)
  • TGeoManager::Export(“geom.cad”)
    • On the wish list

GEOM – Status and developments






  • Great work and big development effort made by Richard Maunder and Timur Pocheptsov for geometry GL rendering in the context of TViewer3D reorganization
    • Solid GL rendering supporting: light models, picking, transparency, clipping, …
    • Full support for CSG rendering (composite shapes)
    • TPadView3D – OpenGL acting as a pad
    • Many other “goodies” coming soon (see Richard’s presentation)

GEOM – Status and developments

to do list
To-do list
  • Short & medium term
    • Work on TGeo-G4 interface
    • Support for scaling transformations (October release)
    • Support for parameterized shapes (December)
  • Medium to long term
    • CAD I/O
    • Geometry builder GUI

GEOM – Status and developments

  • Existing functionality and API of GEOM classes quite stable
    • Mostly small fixes
  • Navigation interfaces with transport engines validated
    • GEANT3 and FLUKA
  • GEANT4 – TGeo interface under development
    • Preliminary version this year, but a more complete one in the next
  • New features already in or scheduled
    • New shapes, assemblies of volumes, I/O, builder GUI
    • Most on user demands

GEOM – Status and developments