[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