A 3D optical simulator called Optic Sketch - https://opticsketch.github.io/opticsketch/ https://opticsketch.github.io/opticsketch/. I sometimes need to have a

A 3D optical simulator called Optic Sketch - https://opticsketch.github.io/opticsketch/ https://opticsketch.github.io/opticsketch/. I sometimes need to have a quick but realistic model of an optical system without paying a few thousand for some of the well known commercial offerings, so I've been building this.