GGX shader for YafaRay

Category:feature request
Assigned:David Bluecame

GGX is a microfacet shader for specular components that should solve some of the problems of the current microfacet model used for glossy specular, which produces too much of a 'plastic' look when used for reproducing metallic materials. Also another issue of the current model is that when maximum exponent is used for sharp glossy reflections, it does not converge to a true mirror reflection like in other software and some glossiness always remain. If implemented, this could solve also this feature request, as a glossy shader with maximun exponent is the only way to get sun disk on mirror like reflections from sun lamps and sun components in sunsky models in YafaRay.

I am going to do more request about texturing in the coming weeks so this is only one example of improvements we could do in that front. Greetings.




About the idea about converging to a true mirror with full exponent with glossy material, this is what I mean taking as a comparison Marmoset Toolbag.

Comparison between YafaRay (left) and Marmoset (right) 100% strenght glossy specular models with full exponent. Marmoset toolbag converges to a true mirror reflection with full exponent, with both Blinn and Ggx microfacet shaders.


Assigned to:Anonymous» David Bluecame