Chapter 13 - Cones won't reflect like mirrors

Hi,

Here is my scene YAML (note I renamed a few keys to make the parsing easier on my side - i.e. field_of_view and typed):


# ======================================================
# the camera
# ======================================================

- add: camera
 width: 400
 height: 200
 field_of_view: 0.314
 from: [8, 3.5, -9]
 to: [0, 0.3, 0]
 up: [0, 1, 0]

# ======================================================
# light sources
# ======================================================

- add: light
 at: [1, 6.9, -4.9]
 intensity: [1, 1, 1]

# ======================================================
# describe the elements of the scene
# ======================================================

# floor
- add: plane
 material:
   pattern:
     typed: checkers
     colors:
       - [0.5, 0.5, 0.5]
       - [0.75, 0.75, 0.75]
     transform:
       - [scale, 0.25, 0.25, 0.25]
       - [rotate-y, 0.3]
   ambient: 0.2
   diffuse: 0.9
   specular: 0

- add: cylinder
 min: 0
 max: 0.75
 closed: true
 transform:
   - [scale, 0.5, 1, 0.5]
   - [translate, -1, 0, 1]
 material:
   color: [0, 0, 0.6]
   diffuse: 0.1
   specular: 0.9
   shininess: 300
   reflective: 0.9

- add: cone
 min: -0.75
 max: 0.0
 closed: true
 transform:
   - [scale, 0.5, 1, 0.5]
   - [translate, -2, 0.75, -0.4]
 material:
   color: [0, 0, 0]
   diffuse: 0
   specular: 1
   ambient: 0
   shininess: 300
   reflective: 1


This gives me the following image:



As you can see, the cone is completely black, but it should be reflective.

The relevant Cone code is at: github.com/jamesmcm/raytracer_challenge_scala/blob/master/src/main/scala/raytracer/Cone.scala

All the tests are passing.