Thank you Bruce and Tarquin for the ideas. I decided to make a practice
map so I could see how all this actually works. The results are ...
Interesting!
This zip file contains the entire project.
https://campercaver.net/MiscFiles/PracticeMine.zip
There are several versions of the map which I did as I added objects to
it. The last two runs are PracticeMine-4.0.pdf and PracticeMine.pdf.
The only difference between the two is the addition of a "join" line in
the .th file. Wow, did that ever drive Therion crazy!
Going back to the 4.0 map - I can easily add a join between the two
walls on the east side. The thing I am wondering about is how the
columns are drawn. There is a white triangle in the middle of the map
which show where the two scraps come together. Two columns are split
across the connection. I drew them with "-outline in" on one scrap and
did not draw them at all on the second.
If I draw only that part of the column which is in each scrap, can I
still use "-outline in"? Will I need to use line joins to get the two
parts of the column to come together? And will that result in a column
that is entirely white on the inside?
===============
Bill Gee
On 12/3/24 13:06, Bruce Mutton wrote:
> using a border line instead of an invisible wall for scrap borders in
centre of a passage / open space
There are a number of considerations here. This wiki post describes
them https://therion.speleo.sk/wiki/drawingchecklist#wall <https://
therion.speleo.sk/wiki/drawingchecklist#wall>
It may be that using line wall -visibility off is a better solution than
either line wall -subtype invisible or line border -outline out -
visibility off
Tarquin’s overall approach is how I would do it. Always end/start
surveys between pillars, and each open end of a scrap only joins with
one other scrap, to avoid the open triangle in the apparent interior of
the cave. Even if you make a mistake in the field and end a survey in
the middle of a void far from the pillars, strategic drawing of the
scrap walls can mitigate the problem. Imagine Tarquin’s sketch
attachment with say the left-hand survey station missing, so the station
joining with another survey to the left is in the centre of the void.
So you draw the sketch exactly as Tarquin has (with walls defining the
pillars at distant-left, just there is no station between them) and it
will work.
See also https://therion.speleo.sk/wiki/
faq#how_do_i_join_three_scraps_in_a_y-shape <https://therion.speleo.sk/
wiki/faq#how_do_i_join_three_scraps_in_a_y-shape>. The XTherion
‘tricky’ image demonstrates a simple case. What is really happening is
that a three-scrap join is turned into a series of two-scrap joins.
These can then be joined semi-automatically as described in https://
therion.speleo.sk/wiki/tips#joining_scraps_together <https://
therion.speleo.sk/wiki/tips#joining_scraps_together>
Bruce
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