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Re: Shader - Specular Term - Fresnel
Thanks guys for the input, although I'm still getting weird results when I combine the Fresnel with the final spec output via a multi, namely, a strange halo in the middle of my spec. The only ones that seems to work for my case is either a Lerp or an Add, controlling the spec by itself and the fresnel on it's own, but in… -
Re: Shader - Specular Term - Fresnel
Are you multiplying you fresnel by an environment map? Is that environment map linear? If you have a full diffuse (with all it's lighting and intensity set up without the spec factored in) then lerping between your full specular reflectance (environment map) and full diffuse reflectance (ideally including the indirect… -
Re: Shader - Specular Term - Fresnel
How is your Fresnel tweaked? Do you have any way to debug? As in visualize the fresnel just as color? As far as I can remember it should just be a matter of multiplying the spec with the fresnel, same for reflections. -
Re: Shader - Specular Term - Fresnel
Ah, OK, understood, my Cube was Emissive based, hence the reason I wasn't able to read my spec properly, d'oh and red face all around, totally forgot to add the Cube into my whole process. Cheers guys and thanks. -
Re: Shader - Specular Term - Fresnel
I assume that's because you're likely to get a Fresnel effect facing away from the main light/s. Think of a shiny car, at maybe 4pm. Looking across the (flat roof), away from the lights, you're likely to get a similar effect from the surface. Fresnel just plain added to spec could be interesting, maybe a bit overblown as… -
Re: Shader - Specular Term - Fresnel
The way I've been using it is multiplying the final spec value by the frensel value then adding that to the diffuse * diffuse lighting. The fresnel value is usually extremely low (most non-metal surfaces are between 0.01 and 0.04 - metals can go up to about 0.5). This means that the specular result is strongest at glancing… -
Shader - Specular Term - Fresnel
Hey to all, I was wondering what would be the best way to put up a Specular-Fresnel term. For example, I currently have my Fresnel term mutiplied with the Blinn/Phong term, before being fed into the Exponent and etc. which is lastly being added to the final output, so that at glancing angles, the fresnel kicks in, but only… -
Re: Shader - Specular Term - Fresnel
I dunno if I'd call fresnel the specular term, but it's certainly a major part of realistic specular. You still need to calculate the traditional specular term, but the fresnel value acts as a mask in order to ensure that the specular highlights are most prominent at glancing angles. There's a whole other thing with energy… -
Re: Shader - Specular Term - Fresnel
This is sort of a point I'm curious about as well because in my mind the fresnel should handle most cases of specular, and for all intents and purposes, to me 'fresnel' is the specular term. Multiplying a reflected cubemap with the fresnel term (after you've adjusted it's falloff etc) is pretty common for shiny materials,… -
Re: Shader - Specular Term - Fresnel
I just updated my Physically Based cgfx shader for Maya earlier today. Added a version which has multiplier sliders for several textures per request. It features many similar things to the black ops slides you mention CrazyButcher. It has an energy conserving specularity which you control with a roughness texture along…
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