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[Tarquin Wilton-Jones]

> I dislike using extended elevations.  The folding that is done to create 
> the perspective really messes with the presentation.  Plain unfolded 
> elevations are, I think, much more useful.


I was not talking about extended elevations. I was talking about 
projected elevations. They are projected on a specific bearing. That is 
exactly what you are asking for, I think.

I export a new .xvi on my chosen bearing:
export map -projection [elevation 256] -fmt xvi -output 
"somesurvey/somesurvey elevation256.xvi"
Then I create a new .th2 for that, and draw the passage ceiling and 
floor as scraps, the same way you would normally draw walls in plan 
view. Make sure each scrap has "-projection [elevation 256]", and I name 
my scraps accordingly. Input that in my .th:
input "somesurvey elevation256.th2"
Add a map with "-projection [elevation 256]" and add all the relevant 
scraps to it.

Extended elevation ("-projection extended") normally for potholes and 
some caves.

Projected elevation ("-projection [elevation 256]") for caves where you 
want to maintain the horizontal relationship between passages. I use it 
for metal mines with multiple levels.

> My comment about joining elevations was related to treating them like 
> cross-sections.  I suspect that scraps of "projection none" cannot be 
> joined.


I don't know if you can. I have never done so. Since it relies on you 
positioning them at certain coordinates within other scraps of the main 
projection, it probably would not be possible.

> Keeping track of multiple thconfig files is a pain.  As a big-picture 
> item - I think that should not be necessary.  The fact that it IS 
> necessary points to some needed improvements.


I very much agree. I would dearly love for .thconfig to have something like:

selection
   select map1 at mycave
   ...do things...
endselection
selection
   select map2 at mycave
   ...do things...
endselection

Really hate having to maintain several different .thconfig files and 
link them together. But until such a thing exists, I use what I use :)