File:Computer rendering of a wine glass caustic.png

Summary
The rendering methodology is explained in further detail on https://photonicsdesign.jimdo.com/physics-at-home/ and in the following publication: "Wine glass caustic and halo analogies", Appl. Optics Vol. 57(19), pp. 5259-5267 (2018), https://www.osapublishing.org/AO/abstract.cfm?uri=AO-57-19-5259
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