improved indentation again in pixel_colour_from_ray()
tree1c7fc1c0474366970acf66939e4ae5f12fc0e53e
-rw-r--r-- 36975 raytracer.erl
-rwxr-xr-x 86 run-concurrent.sh
-rwxr-xr-x 112 run-distributed.sh
-rwxr-xr-x 82 run.sh