gear::MaterialMapFactory Class Reference

Factory to create material maps using GearDistanceProperties. More...

#include <MaterialMapFactory.h>

Public Member Functions
	MaterialMapFactory (const MaterialMapFactory &)=delete
MaterialMapFactory &	operator= (const MaterialMapFactory &)=delete
	MaterialMapFactory (GearMgr *gearMgr)
virtual	~MaterialMapFactory ()
	Destructor.
MaterialMap *	createMaterialMap (double xmin, double xmax, int nxsteps, double ymin, double ymax, int nysteps, double zmin, double zmax, int nzsteps, int coord)
	Creating a material map in memory. More...

Protected Attributes
GearMgr *	_gearMgr = nullptr
std::map< std::vector< double > , MaterialMap * >	_managerMap {}

Detailed Description

Factory to create material maps using GearDistanceProperties.

Author

A. Muennich, CERN The intention of this utility is to save computing time, if an application has to call GearDistanceProperties 1000s of times it is slow. If the application can live with some approximation of material budget thi utility provides a map of the material in memory that can then be querried by the application. The creation of the map happens once and will take some time, but its usage by the application is then fast. The idea is to use the factory to create a map in the interseting region which the precision required. If possible one should make use of detector symmetries to limit the size of the map and gaining in computing time or invest in more granularity. Run time examples: If GearDistanceProperties are implemented with TGeo myMapFactory->createMaterialMap(-200,200, 10,-200,200,10 ,-200, 200, 10, 0) takes 7.2 s for 1331 entries (10x10x10 steps), 5 s of that is needed to load in the geometry from gdml into ROOT. Creating a map with 100x10x10 takes 22s and 100x100x100 already 28 min.

Version

$Id$

Definition at line 30 of file MaterialMapFactory.h.

Member Function Documentation

MaterialMap * gear::MaterialMapFactory::createMaterialMap	(	double	xmin,
		double	xmax,
		int	nxsteps,
		double	ymin,
		double	ymax,
		int	nysteps,
		double	zmin,
		double	zmax,
		int	nzsteps,
		int	coord
	)

Creating a material map in memory.

Three coordinate systems are supported: coord=0 : CARTESIAN (x,y,z) coord=1 : CYLINDRICAL (r,phi,z) with r>0, 0<phi<2Pi coord=2 : SPERICAL (r,theta,phi) with r>0, 0<theta<Pi 0<phi<2Pi With min and max the beginning and the end are defined and step is the number of steps that defines the granularity of the map.

Definition at line 14 of file MaterialMapFactory.cc.

---

The documentation for this class was generated from the following files:

• MaterialMapFactory.h
• MaterialMapFactory.cc