mesh2gdml: from CAD to Geant4

As particle detectors and physics analyses become more complex, the need for more detailed simulations of the detector response becomes increasingly important. Traditionally, two-dimensional engineering drawings have been interpreted by physicists who then implement approximations to the individual parts in software simulation packages. This process requires a high level of experience in both the abstraction of the physical volumes as well as the implementation in code, and is prone to error. mesh2gdml is a program which allows three-dimensional tesselated geometrical volumes to be converted into a format which the Geant4 simulation toolkit can import directly. This provides a pathway for simulating the response of detector elements which have been designed in CAD programs without having to write any code.