As with the slope filter the DTE altitude filter is very useful for terrains, although a little more difficult to get to grips with, it is certainly worth making the effort. In a landscape this filter can provide practical effects such as snowline, tree line, shore line as well as being useful for darkening the diffuse response in the material as it approaches sea level. In volumetric cloud materials this filter is used to create the ambient light gradient in the body of the cloud that gives it the illusion of translucency in spite of it being quite opaque in the material. A very useful filter. If your main intent is to produce materials for terrains, slope and altitude are essential filters for your DTE toolkit.