**Illumination:**- Energy physics...
- Radiance: the flux of light energy in a given direction
- Geometry/Visibility: how light energy falls upon a surface
- BRDF: the interaction function of a surface point with light
- Energy Balance Equation: the local balance of energy in a scene

**Approximation:**- Hacks for interaction at a point...
- Ambient: approximating the global energy
- Lambertian: approximating the diffuse interaction
- Phong: approximating the specular interaction

- Reflection vs. Illumination
- Energy of Illumination
- Fast and Dirty Approximations
- Lambertian Reflection Model
- Phong Reflection Model
- Point Light Sources

CS488/688: Introduction to Interactive Computer Graphics

University of Waterloo

Computer Graphics Lab