Design a Camera with Python and PyRayT: Part One – Fotonix and Gizmos

Very cool project. I'm curious, does anyone know how the ray tracing works in this project?

I've never heard of a ray tracer in Python, and am wondering if this is trying to use methods like raymarching with signed distance functions, or if it just takes the hit performance-wise since it looks like there isn't much ray tracing needed to model the performance of the camera lenses.