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@mycave
  ...do things...
endselection
selection
  select map2@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 :)
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