Is dLi(wi) equal to Li(wi)dwi? Because the BRDF is a bit different in Wikipedia.

Where are Lo and wo in this figure?

What is Ei here?

Try this

https://en.wikipedia.org/wiki/Bidirectional_reflectance_distribution_function

idk why the extra cos term divides out because we multiply again in the rendering equation

Is dLi(wi) equal to Li(wi)dwi? Because the BRDF is a bit different in Wikipedia.

Where are Lo and wo in this figure?

What is Ei here?

Try this

https://en.wikipedia.org/wiki/Bidirectional_reflectance_distribution_function

idk why the extra cos term divides out because we multiply again in the rendering equation