Environmental Animation - Blender Foundations: The Essential Guide to Learning Blender 2.6 - page 376

Figure 13.20 Smoke material properties.
Figure 13.21 The Voxel Data texture type.
Down in the Influence panel, enable Density at 1.0. This is the final step that pipes the density values
taken from the Smoke Voxel Data through the texturing system and into the material. Rendering now
produces a nice smokey smoke, like Figure 13.22 .
That's not bad for something in the 3D view, but real smoke has a little more detail than that. Rather
than raise the simulation resolution, there are some tricks that can done with localized noise that greatly