We describe several extensions to TIM, a raytracing program for ray-optics research. These include relativistic raytracing; simulation of the external appearance of Eaton lenses, Luneburg lenses and generalized focusing gradient-index (GGRIN) lenses, which are types of perfect imaging devices; raytracing through interfaces between spaces with different optical metrics; and refraction with generalised confocal lenslet arrays, which are particularly versatile METATOYs.
@article{arxiv.1306.1661,
title = {Dr TIM: Ray-tracer TIM, with additional specialist scientific capabilities},
author = {Stephen Oxburgh and Tomas Tyc and Johannes Courtial},
journal= {arXiv preprint arXiv:1306.1661},
year = {2015}
}