CS488 - Introduction to Computer Graphics - Lecture 17

Comments and Questions


  1. Hierarchical models


What is needed for colour?

  1. An eye.
  2. A source of illumination.
  3. A surface.

How is colour created?

  1. Source of illumination emits light (photons of differing wavelength).
  2. Surface modifies light.
  3. Eye compares surfaces and notices different modifications.

How do we represent colour?

To the rescue,


Lighting Models

Must incorporate geometry in addition to colour


Actual illumination

Actual surfaces

For computer graphics

Start simple, only make it more complex `when we need to', which means `when somebody powerful complains'.

Lambertian Surfaces

Model of body reflection

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