Finished chapter 9

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/ray.rb b/lib/ray.rb
index c1679a5..eb6038c 100644
--- a/lib/ray.rb
+++ b/lib/ray.rb
@@ -14,7 +14,7 @@ class Ray
     return Colour.new if depth <= 0
 
     if rec = world.hit(self, Interval.new(0.0001, Float::INFINITY))
-      dir = Vec3.random_unit(rec.normal)
+      dir = rec.normal + Vec3.random_unit
       return Ray.new(rec.point, dir).colour(world, depth - 1) * 0.5
     end