The Geometry related classes.

Several documents describing these classes are listed below:

The main geometry class is documented in class TGeoManager.
The Chapter about the TGeo classes in the Users Guide
Presentation at ROOT 2002
Presentation/article at CHEP'03
Presentation at ROOT 2004
Presentation at ROOT 2005
Presentation at ROOT 2007

Classes
class	TGeoArb8
	An arbitrary trapezoid with less than 8 vertices standing on two parallel planes perpendicular to Z axis. More...

class	TGeoAtt
	Visualization and tracking attributes for volumes and nodes. More...

class	TGeoBBox
	Box class. More...

class	TGeoBoolNode
	Base class for Boolean operations between two shapes. More...

class	TGeoBranchArray
	An array of daughter indices making a geometry path. More...

class	TGeoBuilder
	Utility class for creating geometry objects.These will be associated with the current selected geometry manager object: More...

class	TGeoCacheState
	Class storing the state of the cache at a given moment. More...

class	TGeoChecker
	Geometry checking package. More...

class	TGeoCombiTrans
	Class describing rotation + translation. More...

class	TGeoCompositeShape
	Class handling Boolean composition of shapes. More...

class	TGeoCone
	Conical tube class. More...

class	TGeoConeSeg
	A phi segment of a conical tube. More...

class	TGeoCtub
	A tube segment cut with 2 planes. More...

class	TGeoDecayChannel
	A decay channel for a radionuclide. More...

class	TGeoElement
	Base class for chemical elements. More...

class	TGeoElementRN
	Class representing a radionuclide. More...

class	TGeoElementTable
	Table of elements. More...

class	TGeoElemIter
	Iterator for decay branches. More...

class	TGeoEltu
	Elliptical tube class. More...

class	TGeoExtension
	ABC for user objects attached to TGeoVolume or TGeoNode. More...

class	TGeoGenTrans
	Most general transformation, holding a translation, a rotation and a scale. More...

class	TGeoGlobalMagField
	Global magnetic field manager. More...

class	TGeoGtra
	Gtra is a twisted trapezoid. More...

class	TGeoHalfSpace
	A half-space defined by: More...

class	TGeoHelix
	Class representing a helix curve. More...

class	TGeoHMatrix
	Matrix class used for computing global transformations Should NOT be used for node definition. More...

class	TGeoHype
	Hyperboloid class defined by 5 parameters. More...

class	TGeoIdentity
	An identity transformation. More...

class	TGeoIterator
	A geometry iterator. More...

class	TGeoIteratorPlugin

class	TGeoManager
	The manager class for any TGeo geometry. More...

class	TGeoMaterial
	Base class describing materials. More...

class	TGeoMatrix
	Geometrical transformation package. More...

class	TGeoMedium
	Media are used to store properties related to tracking and which are useful only when using geometry with a particle transport MC package (via VMC). More...

class	TGeoMixture
	Mixtures of elements. More...

class	TGeoNavigator
	Class providing navigation API for TGeo geometries. More...

class	TGeoNode
	A node represent a volume positioned inside another.They store links to both volumes and to the TGeoMatrix representing the relative positioning. More...

class	TGeoNodeCache
	Special pool of reusable nodes. More...

class	TGeoNodeMatrix
	A node containing local transformation. More...

class	TGeoNodeOffset
	Node containing an offset. More...

class	TGeoOverlap
	Base class describing geometry overlaps. More...

class	TGeoPainter
	Class implementing all draw interfaces for a generic 3D viewer using TBuffer3D mechanism. More...

class	TGeoPara
	Parallelepiped class. More...

class	TGeoParaboloid
	Paraboloid class. More...

class	TGeoParallelWorld
	Base class for a flat parallel geometry. More...

class	TGeoPatternFinder
	Base finder class for patterns. More...

class	TGeoPcon
	A polycone. More...

class	TGeoPgon
	A polygone. More...

class	TGeoPhysicalNode
	Physical nodes are the actual 'touchable' objects in the geometry, representing a path of positioned volumes starting with the top node: path=/TOP/A_1/B_4/C_3 , where A, B, C represent names of volumes. More...

class	TGeoPNEntry
	The knowledge of the path to the objects that need to be misaligned is essential since there is no other way of identifying them. More...

class	TGeoPolygon
	An arbitrary polygon defined by vertices. More...

class	TGeoRCExtension
	Reference counted extension which has a pointer to and owns a user defined TObject. More...

class	TGeoRCPtr< T >
	A reference counting-managed pointer for classes derived from TGeoExtension which can be used as C pointer. More...

class	TGeoRegion
	Regions are groups of volumes having a common set of user tracking cuts. More...

class	TGeoRotation
	Class describing rotations. More...

class	TGeoScale
	Class describing scale transformations. More...

class	TGeoScaledShape
	A shape scaled by a TGeoScale transformation. More...

class	TGeoShape
	Base abstract class for all shapes. More...

class	TGeoShapeAssembly
	The shape encapsulating an assembly (union) of volumes. More...

class	TGeoSphere
	Spherical shell class. More...

class	TGeoStateInfo
	Statefull info for the current geometry level. More...

class	TGeoTorus
	Torus segment class. More...

class	TGeoTrack
	Class for user-defined tracks attached to a geometry. More...

class	TGeoTranslation
	Class describing translations. More...

class	TGeoTrap
	TRAP is a general trapezoid, i.e. More...

class	TGeoTrd1
	A trapezoid with only x length varying with z. More...

class	TGeoTrd2
	A trapezoid with both x and y lengths varying with z. More...

class	TGeoTube
	Cylindrical tube class. More...

class	TGeoTubeSeg
	A phi segment of a tube. More...

class	TGeoUniformMagField
	Implementation for uniform magnetic field. More...

class	TGeoVGConverter
	Geometry converter to VecGeom. More...

class	TGeoVGShape
	Bridge class for using a VecGeom solid as TGeoShape. More...

class	TGeoVolume
	TGeoVolume, TGeoVolumeMulti, TGeoVolumeAssembly are the volume classes. More...

class	TGeoVolumeAssembly
	Volume assemblies. More...

class	TGeoVolumeMulti
	Volume families. More...

class	TGeoVoxelFinder
	Finder class handling voxels. More...

class	TGeoXtru
	An extrusion with fixed outline shape in x-y and a sequence of z extents (segments). More...

class	TVirtualGeoConverter
	Abstract class for geometry converters. More...

class	TVirtualGeoPainter
	Abstract class for geometry painters. More...

class	TVirtualGeoTrack
	Base class for user-defined tracks attached to a geometry. More...

class	TVirtualMagField
	Abstract class for magnetic field. More...

Classes