“Simulate volumetric effects”…what? Those just sound like a bunch of big, fancy words. In plain English, what exactly is a volumetric effect? Put simply, a volumetric effect represents what happens to a subject when it exists in a semi-transparent substance such as fog, smoke, or murky water. Okay. So what does this have to do with a…what did you call it…depth mask? Here’s where things get pretty darn cool. A depth mask is a basic grayscale image that allows us to easily simulate the gradual disappearance of a subject over distance as it is obscured by fog, smoke, dust, or water.