By incident angle, are we referring to the angle of the viewer, or the angle of the light source? From the image, it seems to be the former. But if so, reflectance here, described in terms of the viewer, is distinct from the general physical property of reflectance, right?
Zc0in
Yes, the incident angle referto the angle of viewer. Our eyes is a receiver of light, only the light coming in will form a picture. So, you can see our eyes as a light source since the light path is reversible.
sZwX74
@red-robby I think each material has a base physical reflectance property, but the actually calculation of reflectance depends on the angle. Note how our bsdf in project 3-1 took in vectors wi and wo, so clearly the angle between them led to a factor being applied to the base reflectance value.
By incident angle, are we referring to the angle of the viewer, or the angle of the light source? From the image, it seems to be the former. But if so, reflectance here, described in terms of the viewer, is distinct from the general physical property of reflectance, right?
Yes, the incident angle referto the angle of viewer. Our eyes is a receiver of light, only the light coming in will form a picture. So, you can see our eyes as a light source since the light path is reversible.
@red-robby I think each material has a base physical reflectance property, but the actually calculation of reflectance depends on the angle. Note how our bsdf in project 3-1 took in vectors wi and wo, so clearly the angle between them led to a factor being applied to the base reflectance value.