CADMesh: a CAD file interface for GEANT4

Importing predefined CAD models into GEANT4
is not always possible or requires intermediate file format conversion
to Geometry Description Markup Language (GDML) using commercial or third
party software. CADMesh is a direct CAD model import interface for
GEANT4 optionally leveraging VCGLIB, and ASSIMP
by default. Currently it supports the import of triangular facet
surface meshes defined in formats such as STL and PLY. A
G4TessellatedSolid is returned and can be included in a standard user
detector constructor. Robustness of the interface was
tested using a set of CAD models of various complexity; for the models
used in testing, no import errors were reported and all geometry was
found to be navigable by GEANT4.Additional functionality is included for
the fast navigation of tessellated solids by automatically creating
equivalent tetrahedral meshes thereby making smart voxelisation
available for the solid. Funding source: Cancer Australia (Department of Health and Ageing) Research Grant 614217