Previous | Next --- Slide 53 of 55
Back to Lecture Thumbnails

Zach kindly points out an error in this slide:

I think

d^2 = cos^2(theta) / ||p' - p ||^2

should be:

||p' - p ||^2 = d^2 / cos^2(theta)

or more simply:

||p' - p || = d / cos(theta)


What is d, particularly for the current assignment? In the paper they indicate that it is the distance to the exit pupil, but I couldn't figure out what that was supposed to be either. (I'm trying to use this to figure out the appropriate weight for GenerateRay to return.)

EDIT: Now I see that d is arbitrary since we are integrating over area, which scales with d^2, so the effect of scaling d will be canceled out by the dA' differential in the integral.