Box Twisted around z-Axis

A box twisted around z-axis can be constructed using C++ or some simple text:

:volu twistedBox TWISTEDBOX
 30*degree // angle twisted around z
 30 // half x in mm
 40 // half y in mm
 60 // half z in mm
 G4_WATER // material

NOTE!

• The default unit of the twist angle here is rad, not degree. We need to explicitly multiply the number with degree if we want to use degree as the unit. This is different from untwisted shapes, where the default unit of an angle is already degree.
• The twist must be within ±(0, 90) degree (not including 0 and 90 degrees).

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

git clone https://github.com/jintonic/geant4
cd geant4/detector/CSG/twisted
# generate animated picture, box.gif
./twist.sh
# or launch a UI
gears
# in the UI, run
/control/execute box.mac