Shouldn't the limits of 2nd integral be from 0 to 2\pi? EDIT: I figured out that it is \pi because of the way \theta, \phi are defined.

If Omega is equal to 4pi, does that make A = 1? Additionally, why do we care about very small areas of A. What are its uses for image rendering?

Shouldn't the limits of 2nd integral be from 0 to 2\pi? EDIT: I figured out that it is \pi because of the way \theta, \phi are defined.

If Omega is equal to 4pi, does that make A = 1? Additionally, why do we care about very small areas of A. What are its uses for image rendering?