fixed the ray_sphere_intersection_test() to work with the new intersection function...
tree8b02dd091bc53d526e73c41520c4ce7bd3daf975
-rw-r--r-- 37254 raytracer.erl
-rwxr-xr-x 86 run-concurrent.sh
-rwxr-xr-x 112 run-distributed.sh
-rwxr-xr-x 82 run.sh