Hi Rodrigo -

Attached is a .th2 file from a cave I have recently been working on. This contains two plan scraps and several cross sections, all of which were drawn on one sheet of paper.

===============
Bill Gee

On 1/29/25 09:06, Rodrigo Severo via Therion wrote:

Well,

That's definitely not what I wanted to hear but that's life...

Can you both send me one or 2 th2 files so I can better understand how to deal 
with them? A typical one and, maybe, a non-typical but important one also?

After a way too long respite I am working again in Mapiah the, I wish some day, 
userfriendly and non-vaporware Therion Graphical Interface.


Thanks.


On Wednesday, January 29th, 2025 at 11:50 AM, Tarquin Wilton-Jones via Therion 
<[email protected]> wrote:



Hi Rodrigo,


A general question: can someone point me a reasonable situation where
having 2 scraps in the same TH2 file makes sense/is important?


It is exceedingly rare for me to have a .th2 with just one scrap.

If one passage overlaps another, then you need two scraps do they can be
drawn below above/below each other properly (eg. with translucency, or
just hiding the lower passage, or with background colours). That could
just be a short roof tube, or a fork where one climbs over the other. It
would be crazy to have another .th2 file for each of them, since you
probably surveyed them at the same time. So instead, you have two scraps
in the one .th2 file.

Back before you had smooth-shading, you needed to break your survey into
several scraps just so it could colour them differently by altitude as
the passage sloped uphill (eg. one scrap for every 5 metres altitude
change). You still need to do that if you have abrupt changes in height,
since smooth-shading will not change colour nicely at the edge of the
drop, but it will change colour nicely at the edge of a scrap, as long
as it has the correct stations marked.

If you have a high level passage that intersects a lower level passage
(so you have a pitch down into it), then continues at high level on the
other side, and you surveyed the upper level stuff all in one survey,
you would have to end the first scrap where it joins the passage, then
create a new scrap on the other side. This is because a scrap cannot
have multiple outlines. Although Therion might sometimes understand it
if you do have 2 outlines in one scrap, it cannot export it properly in
KML format, and struggles with some other outputs too. So you are not
supposed to do it. You are supposed to use two scraps.

I also have my ropes on a rigging topo in separate scraps from the cave,
so we can use maps to select the rendering with and without some of the
ropes (where a layout can only disable them completely).

Sometimes, I have another scrap just for adding another layer of
information on a survey, such as hardware serial number labels for fixed
aid maintenance. I don't want them on the main survey since regular
cavers won't know why XY123 is written next to an anchor, but I want
them for when I create a special version of the survey for the hardware
maintainer.

Lots and lots of reasons :)


Cheers,

Tarquin
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encoding  utf-8
##XTHERION## xth_me_area_adjust -132.0 -2652 3428 141.0
##XTHERION## xth_me_area_zoom_to 100
##XTHERION## xth_me_image_insert {0 1 1.0} {0 {}} {2017_09_22 SHN-017 CAVE 
SPRING CAVE SKETCH 2.jpg} 0 {}



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endscrap



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area water
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endscrap



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area clay
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endscrap


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