Finally got through Ray Tracing in One Weekend.
$ nix-shell
[nix-shell:path/to/cpprtr]$ ./main && feh out/main.bmp
[nix-shell:path/to/cpprtr]$ ./profile
Finally got through Ray Tracing in One Weekend.
$ nix-shell
[nix-shell:path/to/cpprtr]$ ./main && feh out/main.bmp
[nix-shell:path/to/cpprtr]$ ./profile