I started experimenting this evening.  I have Vue6 esprit, with the latest beta update.  I know that I don't have access to many of the functions shown in your tutorial, but I cannot get a symmetrical terrain to show up at all with a volumetric material, even with density turned all the way up, and fuzziness turned all the way down.

I tried something similar with a sphere, and had some luck, but not much.  I cannot get much intensity to show up, and unless I flatten the sphere relative to the camera, I get a "light blue" effect all around.

greg