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Illumination Models (Lambertian / Diffuse / Matte / Body Reflection…

- - - - greatest when surface normal points straight to viewer
      - reduces with cos() rate
      - but, for 1 angle, more surface can be seen from viewer according to cos() as the surface slants away from the viewer
    - - surface further -> less light intenisty according to inverse-square law
      - but, for 1 angle, more surface captured
  - - - Physically, for a point light source, this dies off in inverse
        proportion to the square of the distance
      - if used, it looks go down unrealistically fast because real lighting not from 1 single point of src.
- - - - Diffuse: Light is reflected from a surface in many different
        angles e.g. rugged surfaces
      - Specular: light is reflected from a surface in the same angle as
        the incident ray e.g. glossy surfaces