A couple of very interesting ideas here. I tried them out this morning
on a small test cave. I will have to think about this for a bit to see
how it might be useful.
My small test cave has a total of about 80 feet of passage. There are
three scraps which come from background sketch on two different sheets
of paper. The same sheets also include profile and cross-section sketches.
The first thing I did was Tarquin's method of creating a single .th2
file. Creating the file was easy - just adding another export line to
the thconfig file. It produced a valid .th2 file which has all objects
from all scraps. The joins were already performed.
There was no background image, so adding anything to this would be a
matter of eyeballing it. I don't think there is any way to add a
background image that would make sense.
The second thing I did was review Marco Corvi's documentation at the URL
Tarquin provided. The new thing I learned is that backgrounds can be
assigned to scraps as well as the drawing area. With my test cave I
added background to the three scraps, added the appropriate export line
to thconfig and then compiled.
In the map editor I then started a new .th2 file. I imported the .xvi
as the drawing area background. It came in. I can see where all three
sketches were apparently overlaid. There is a nice centerline for the
entire cave.
The problem is the sketches are not transparent enough to use. The only
part of the sketch that has any visible drawing on it is for the last
scrap mentioned in the map statement of the .th file. The other
drawings are not visible.
The result file can be seen at
https://campercaver.net/MiscFiles/test.xvi
===============
Bill Gee
On 8/3/23 15:13, Tarquin Wilton-Jones via Therion wrote:
Something along the lines of
map ProblemchamberMP
GrandcanyonSP
FlatroomSP
endmap
select Problemchamber
export map -proj plan -o Problemchamber.th2
Instead of exporting to pdf, this will then export this to a .th2 file,
where I guess it will appear with all the lines you have joined, instead
of you having to join them with line joins/scrap joins or amending line
end positions to force therion to automatically recognise them.
This will allow you to work on the whole chamber as one in a single .th2
file.
Fun fact, you can even ask therion to take the sketches, and output
those, pre-warped and pre-scaled, aligned to each other. It's fairly
advanced stuff though, and I only used it once while boggling slightly.
Sketch Morphing, in the Therion book. Or here:
http://marcocorvi.altervista.org/caving/tbe/m_04/m_045.htm
That's harder than the original problem, but very cool if you wanted to
use it, since it can solve this exact problem (multiple surveys of
different arts of the same chamber at different scales).
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