Sun and Detail Enhancement

[tangelder]

Re: Sun and Detail Enhancement

Gijs, can you help me on this?
I was wondering what the sr means in W/m^2/sr.
best,

Joost

[dalomar_cg]

Re: Sun and Detail Enhancement

That whole albedo thing is basically a counterpart to what is called BDRF. BDRF stands for Bi-Directional Reflectance Function, and is basically a function that is responsible for how a material reacts to light. So as I understand it the albedo is relating to the different material properties, but specifically the material's reaction to the sun.

There really isn't a comparable value for albedo that we can set through v-ray (its not an RGB thing), but you were kind of on the right track with the Lele .255 thing. In the video Lele says (I think its towards the end of the 3rd clip) that using the .255 method is likely due to not having the proper BDRF. And that would lead to an incorrect albedo.

As for the last question I might as well explain the whole equation so that way the SR make sense for people who may not be familiar with it (it won't take long). The W is basically the measure of the light intesity (radiance) and the m^2 is taking the measure of that intensity over a given area. The SR is actually relating to the angle at which the light is hitting the surface. The closer that angle is to normal with the surface the more of the light intensity is reflected.