Here is an updated fresnel mod that uses the new shader framework from 2.11 alpha ( Dev build 16617-10107 ). Just install the latest Dev Build using tdm_installer and place the pk4 file into the darkmod folder.
In TDM 1.03, Doom 3 modder "JC Denton" added the new "HDR-lite" shaders which included Fresnel effect and darkening below objects. Many of these features were modified or removed when TDM was converted to use GLSL. This mod restores most of these effects.
Nice.