Glossy Falloff Curve Experiment

[Rimas]

Interesting stuff!I was sometimes using a blend with the same material and higher glossiness for that 'rim' effect, like a spaz :D

And +1 to Alex Roman's stuff, the guy's a freakin' legend to those who know his work!

[GestaltDesign]

I am a little puzzled as I thought that the original idea of the GGX/GTR BRDF code factored fresnel glossy falloff into the reflection model.
Or is the fresnel code for reflection only and not roughness (hence the minor impact on a custom Fresnel Map that Ondra confirmed recently).

[Ondra]

I am a little puzzled as I thought that the original idea of the GGX/GTR BRDF code factored fresnel glossy falloff into the reflection model.

it does, but some people just have to have custom solutions to everything ;)

there might also be currently some bugs

[GestaltDesign]

Thanks for the confirmation Ondra!
If you are really going for a material specific physical approach then you are best off building on a simpler BRDF model anyhow then and replicating the behaviour in real world terms.
Potentially an expensive route for minuscule gains in realism I imagine.

[Flavius]

Hi there everyone,

I'm very interested in this glossiness change per angle. The best I could see it in real world is by taking my wacom tablet and putting it next to my monitor. When my viewing angles turned to a high angle, the reflection was pretty sharp, compared to looking straight into it.

I can barely notice the effect with "natural" GGX shader in Corona, but I was expecting a much higher difference in glossiness, now it is barely visible. I surely couldn't recreate the effect of the Wacom surface without using a falloff map in the glossiness slot

[maru]

You cannot expect a "universal" shader that will work with everything. In real world, this is dependent on the micro structure of materials.

[Flavius]

Hi Maru,

Thanks for replying. That is correct, so applying a fallof curve in the glossiness is still the best way to go for more complex materials.

I must say, Corona shader is the best I've seen so far :)

Kindly,