[UE4] What am i supposed to do with specular input? :)

Lether

Hey guys,

I know there are plenty of thread on this subject but i don't find (understand?) what to do with specular input in ue4.

If I use it (specular input) to tweak my matérial, is it bad? Does it "destroy" all the PBR data on my matérial if I use it?

If you know a thread who discuss about my question I'd be happy to take a look on it. I searched after one, but didn't find... So much thread over here

LMP

In most cases, you just leave it alone. Only in very rare cases would you ever need to modify it in anyway.

leleuxart

You don't have to use it. By default the engine has it internally set to 0.5 and it applies to all non-metals. The entire shading model of standard materials is based on the assumption that the materials have a 0.5 specular intensity. The simple use of it is to just use a constant and a value of 0 to 1 to adjust the strength to increase/decrease specularity, which in most cases has a stronger impact on Fresnel and the falloff. But some people use something like a cavity map as a form of micro-occlusion to reduce the strength of reflections in areas of the normal map that might feel too reflective. 

Lether

Thank you guys. Exactly the answer i wanted to read Simple and clear ! Now i understand perfectly. Have a good night