Adding the roughness

- [Instructor] The roughness mapping material is often times … the one that helps us understand what kind of surface … or material we are meant to be looking at, … and even what condition the object is meant to be in. … For example, if we see a noticeably reflective stone wall … we might conclude that it has either been raining … or that at some point and for some reason … an amount of water has been dumped on it. … If we see a metal that doesn't have any real shine to it … then we may assume that it is in poor condition, … it is very old, or both. … Of course these are not strict rules and so we simply … mention them to help illustrate why setting up a flexible … roughness map for our material would be a good thing to do. … With that in mind then, what we will probably want to do … is give our user the option to use just a single roughness … color without variation for our newer type materials. … And also, so is to be able to add more variation … and so story to an object a bitmap as well. …