A ray-casting engine written as an
[ExprTK](https://github.com/ArashPartow/exprtk) Expression within
[Perspective](https://github.com/perspective-dev/perspective). As presented at
[Open Source in Finance 2022 NY](https://www.youtube.com/watch?v=0ut-ynvBpGI).

This example has no server component, and all ray-casting is done entirely
within the Perspective WebAssembly engine.
