Parallelepiped

A parallelepiped can be constructed using C++ or some simple text:

:volu parallelepiped PARA
 30 // half x in mm
 40 // half y in mm
 60 // half z in mm
 10 // alpha in degrees
 30 // theta in degrees
 20 // phi in degrees
 G4_WATER // material

The full source code is in detector.tg, which can be visualized using the macro file mingle.mac or gears.mac, assuming an universal Geant4 application, such as MinGLE or GEARS, is available:

git clone https://github.com/jintonic/geant4
cd geant4/detector/CSG/para
# generate animated picture, para.gif
G4VIS_DEFAULT_DRIVER=TSG_FILE gears gears.mac