Is it now 50_pp_klepto_fog.lua ?
I tried using this and get these:
http://ibin.co/26GDiJcVU14Q
http://ibin.co/26GDnw3UvKje
here is the code (also tried just adding to the Scene root, same effect):
mfog = self.camera:AddPostEffect("AddOns/Post Process Shaders (shadmar)/50_pp_klepto_fog.lua")
self.camera:SetFOV(70)
self.camera:SetRange(0.05,16000)
self.camera:SetMultisampleMode((System:GetProperty("multisample","4")))
--self.camera:AddPostEffect("Shaders/Post Process Shaders(shadmar)/50_pp_klepto_fog.lua")
self.camera:SetKeyValue("fog_fogrange","5,25")
self.camera:SetKeyValue("fog_fogcolor","0.7,0.66,0.62,0.6")
self.camera:SetKeyValue("fog_fogangle","5,21")
self.camera:SetKeyValue("fog_fogislocal","1")