Difuse + specular, what is that?

[Kinpatsu]

I'm a bit of a noob at this, what's the difference between difuse and the specular mode? I can't even tell the difference in the image within the game settings, I've searched but haven't found anything about it. Is it worth activating diffuse + specular mode everywhere or do I just leave diffuse everywhere?

[Drake Ravenwolf]

Diffuse is when light hits a rough surface and spreads it all over the place eg why walls tend to be rough and painted white.
Specular is... well mirror like reflections where the light comes back in a form very similar to it was when it hit - aka shininess

Speaking in general not specific to this game.

[Kinpatsu]

Oprindeligt skrevet af Drake Ravenwolf:

Diffuse is when light hits a rough surface and spreads it all over the place eg why walls tend to be rough and painted white.
Specular is... well mirror like reflections where the light comes back in a form very similar to it was when it hit - aka shininess

Speaking in general not specific to this game.

tks man. personally, do you think the performance cost for difuse + specular is worth it?