Thanks Ivan :o) Yeah, someone really needs to do a good tutorial on the function editor. I'm maybe 1/2 way to really understanding it, so don't know when i can do that.

There is a guy making cool examples of many functions on his site, and the Vue 5 Infinite manual goes into it quite a bit. 'The Vue 5 Function Node Project'. Nice BIG material samples!
http://www.microbion.co.uk/graphics/vue/funcnodeproject.htm

That 'Procedural Terrains A to Z' tutorial at Cornucopia 3D (by the famous and highly skilled Vue artist Robert Czarny) does show some practical uses of the Function Editor in real scenes.

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'Art Head Start.com Free chapter, Vue tutorials, models, Web Tutorials Directory.