Smallish program to trace rays through the optical setup from this paper.
Currently models a point source from centre of bottle, and a ring of point sources on bottle's surface.
To run one a single core/thread
./install.sh -n 1
To run on all available threads
./install.sh
Gfortran 7.5+ or 9+ if you want to supress openMP warnings whilst using default(none) GNU Make 4.1+