= Assignment 4 Discussion =
Don't hesitate to ask questions.
Q1: The first question says "L(phi, theta) = cos(theta) when theta > PI/2 and L(phi, theta) = 0 otherwise." Shouldn't this be for theta < PI/2, so that it's cosine-weighted hemisphere sampling, which is more appropriate here? If theta > PI / 2, the arrangement doesn't make much sense - the luminance would be negative! And Shouldn't we also be weighting by the cos(theta) term in the radiance function (or is this already implied)?
Isn't the integral of cos(x) = sin(x), so we get a positive area? (PaulTarjan)