[Therion] Extended elevation

[Andrew Atkinson]

I am struggling with the extend: left right normal and reverse, they do 
not seem to be doing what I would expect or as described at

http://therion.speleo.sk/wiki/doku.php?id=tfc:321

therion 5.3.7 on debian wheezy

These have been generated from the th file attached, which was an import 
from pocket topo. The file is as I needed it to work, for the below, 
remove all extend commands and then only add before the first line as 
shown. which is how PocketTopo export comes in. Adding it to the 
centreline -extend ##### seems to have the same effect as below. They 
are all viewed in the pdf, as I really have nothing else at the moment :(

Also it appears that the extend command, moves all the splays in the 
same direction, which I guess is how survex intended it, but this is 
different from the PocketTopo, that treats slays differently and to me 
more sensibly (well in most situations). But this is not really that 
important as the splays generated by therion are not used for the 
PocketTopo image import.

Noextend.pdf as it says has all the extend commands removed, so I would 
expect everything to go right, apart fro, 2.0 to 2.1 goes left


case1.pdf
So add extend right before the line

extend right
   2.0 - 260.00 11.60 2.610

So the legs go right then left, right,left right right...right, left, 
leftleft???

case2.pdf (file not included as it is the same as Noextend)
extend normal
   2.0 - 260.00 11.60 2.610

should be the same as right (unless I am missing a subtle difference) 
and no commands at all. It is the same as Noextend.pdf but different 
from case 1

case3.pdf
extend left
   2.0 - 260.00 11.60 2.610

opposite of right so at least consistent
left, right, left, right, left, left ... left right, right

case4.pdf
extend reverse
   2.0 - 260.00 11.60 2.610

consistent again: opposite of normal, but the first leg goes right 
instead of left and the they all go left

So normal and reverse seem to work apart from the first leg, but left 
and right are doing something strange to the first few legs

Using the commands in anywhere else in a linear part of the centreline 
mostly seems to work fine, and as expected, continuing down the 
consecutive numbering at a branch fine (but this could also be the order 
of the data in the file). However, left and right are less reliable than 
normal and reverse?? But not worked out a pattern yet. Other branches it 
is less clear for and this email is long enough

Andrew
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