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I am a little confused... For the numerator of dw, why are we using theta, instead of theta'?


Yea have the same question. Should the numerator of dw use theta'? And in the very bottom line, I'm thinking it's outgoing radiance from light point p'?


Also, there might be a typo in the description of Lo(p',w') (Outgoing radiance from point "p'", in the ...)


In this case, the cost of the integrate process will be related to the amount and area of all the light sources. Which will also cause performance problem when the amount of light sources is large.