Implementation of a simple raytracer in Lua, mostly following the structure of Peter Shirley's "Ray Tracing in One Weekend" series of books.

This scene was rendered in under 3 hours at 1024 samples per pixels, 400x225 resolution, on a single core of an M1 Pro.

• Support for tev image viewer. No PPM output, as in books, because tev can save OpenEXR, which is much much cooler.
• Progress view, showing the total amount of work, elapsed time, and estimated time of completion.
• BVH acceleration from the second book in the series.
• No depth-of-field or motion blur (those are boring).
• Everything is a sphere.
• Is literally my first attempt at coding in Lua, and trying to learn the idiomatic ways of doing things, as well as trying to keep it relatively fast.

To run, start the raytracer from the command line, providing a scene file, and a number of samples.

lua rt.lua scenes/Final1.lua 64

Tev is an extremely fast image viewer with support for HDR images in many formats. This implementation can upload images to tev as they are being rendered.

Install tev, start it up and start the raytracer. Tev will now show and update the image as it's being rendered.