freebsd-ports/science/glens/pkg-descr

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Glens simulates a gravitational lens composed of any number of punctual
deflectors. Light comes from a punctual light source at an infinite distance,
the direction of which can be specified. It is then deflected by a
distribution of punctual deflectors (such as a black hole) into a small
region of space. The rays can be seen, and directions and parameters
specified to see multiple images, or the famous "Einstein ring".