General equation for radiosity

where

r

i

: reflectance

By integrating radiance

E

i

q

i

(or

q

j

) : the angle between normal of

S

i

(or

S

j

) and line segment

P

i

P

j

r

ij

: distance between

P

i

and

P

j

A

j

: area of

S

j

E

j

: radiance at element

S

j

E

0i

: direct radiance(intensity) at

S

i

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