title: Ray tracer artifacts with reflection
body: <p>So I am trying to build a retracer. I followed this tutorial:<a href="https://www.youtube.com/watch?v=SMOJGxyd9BE&amp;list=PLHm_I0tE5kKPPWXkTTtOn8fkcwEGZNETh&amp;index=9" rel="nofollow noreferrer">https://www.youtube.com/watch?v=SMOJGxyd9BE&amp;list=PLHm_I0tE5kKPPWXkTTtOn8fkcwEGZNETh&amp;index=9</a></p>
  
  <p>So everything works great, except I ran into one problem. I was trying to make the plane under the spheres reflective, but when I did I got this strange effect </p>
  
  <p><img src="https://i.imgur.com/UuW2nqZ.jpg" alt="http://imgur.com/UuW2nqZ"></p>
  
  <p>If you notice there are these dark spots on the reflection on the ground. I have been trying to figure out whats going on, but its strange because the entire plane has the same normal, so the reflections should be correct. Has anyone ever had an experience with this? I checked and it wasn't related to shadows. </p>