Based on Ray Tracing in One Weekend, Version 3.2.3, 2020-12-07.

See also C# implementation.

$ git clone https://github.com/ronnieholm/Ray-tracing-in-one-weekend-FSharp.git
$ dotnet run --configuration release RayTracingInOneWeekend.fsproj > out.ppm
$ display out.ppm

The F# implementation is based on newer version of the book than the C# version. So benchmarks aren't comparable:

.NET 5 (Linux)

$ dotnet run --configuration release RayTracingInOneWeekend.fsproj benchmark
Render time: 00:01:33.0886140

• C++ reference implementation
• 3D Programming Fundamentals [3D Perspective Projection] Tutorial 4