[Therion] Surface profile in elevation maps

[Steve Clark]

[re-sent due to email address error]

I am looking for some advice on the best way to add the profile of the 
ground surface to a cave elevation (for pdf export). Apologies if this 
is in the book and I've missed it.

Currently, I have the background colour as a light grey, with cave the 
foreground in white. This works well, is easy to read and looks good. 
Sample section here : 
https://dl.dropboxusercontent.com/u/4064739/draft_section_18may2013.pdf

Assuming I can draw the ground profile, is there a simple way to change 
the colour above the ground (i.e. the sky) to white too?

If not, and it's better to make everything white, what is the most 
consistent way to draw the ground profile as a line in a scrap? Should I 
be using a 'walls' line but inside-out or is there a better/correct way 
to do this?

Any help much appreciated,

Steve