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Code architecture:

1. init rays
2. init objects
3. run ray-tracing
4. display objects
5. display ray paths

Pseudo-code for Ray-tracing

function ray_tracing()

  for each #ray in #ray_bundle
    [#reflect_ray,#refract_ray,#terminated] = find_next_ray(#ray)
    unless (#terminated)
      #ray_bundle.add_rays(#reflect_ray)
      #ray_bundle.add_rays(#refract_ray)
    end
  end

function find_next_ray(#ray)

  #terminated = true
  for each #optics in #optics_list
    for each #surface in #optics
      [#distance, #missed] = hit_test(#ray, #surface)
      unless (#missed)
        #candidate.add([#surface, #distance])
        #terminated = false
      end
    end
  end
  #closest_surface = find_shortest(#candidate)
  #reflect_ray = do_reflect(#ray, #closest_surface)
  #refract_ray = do_refract(#ray, #closest_surface)
  return [#reflect_ray ,#reflect_ray, #terminated]

     [#normal_vector] = get_normal(#hit_position, #surface)
     #reflect_ray = refract(#ray, #normal_vector)

whitepapers for the basic knowledge on geometry and optics.

• Calculating a surface normal https://en.wikipedia.org/wiki/Normal_(geometry)
• Optics Book - https://users.physics.ox.ac.uk/~ewart/Optics%20Lectures%202007.pdf