Done C10, Materials

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/vec3.rb b/lib/vec3.rb
index 08cbf69..3069b65 100644
--- a/lib/vec3.rb
+++ b/lib/vec3.rb
@@ -56,10 +56,18 @@ class Vec3
     self / mag
   end
 
+  def reflect(normal)
+    self - normal * dot(normal) * 2
+  end
+
   def in_unit_sphere?
     mag_sqr < 1
   end
 
+  def near_zero?(s = 1e-8)
+    @x.abs < s && @y.abs < s && @z.abs < s
+  end
+
   def to_s
     "{#{@x}, #{@y}, #{@z}}"
   end