04/09/2002
15-462 Graphics I
4
Classical Radiosity Method
•Divide
surfaces into patches (elements)
•Model
light transfer between patches as system of linear equations
•Important
assumptions:
–Reflection
and emission are diffuse
•Recall:
diffuse reflection is equal in all directions
•So
radiance is independent of direction
–No
participating media (no fog)
–No
transmission (only opaque surfaces)
–Radiosity
is constant across each element
–Solve
for R, G, B separately