04/08/2003
15-462 Graphics I
12
Balance of Energy
•Lambertian surfaces (ideal diffuse reflector)
•Divided into n elements
•Variables
–Ai   Area of element i (computable)
–Bi   Radiosity of element i (unknown)
–Ei   Radiant emitted flux density of element i (given)
– ri   Reflectance of element i (given)
–Fj i   Form factor from j to i (computable)