Lambertian correct? #1719
Description
The book talks about how the directions of the outgoing reflection of light follows a lambertian distribution (normal + unit_circle). It then goes in to calculate the incoming ray based on that formula. Does that make sense?
Isn't the incoming direction totally independend of the outgoing direction for a lambertian material? I mean the light can come from anywhere, and as such, shouldn't the hemisphere method be actually the correct way to calculate the incoming ray?