[Therion] Two scraps in the same .TH2

Bill Gee bgee at campercaver.net
Wed Jan 29 16:25:36 CET 2025


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 <therion at speleo.sk> 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
>> _______________________________________________
>> Therion mailing list
>> Therion at speleo.sk
>> https://mailman.speleo.sk/listinfo/therion
> _______________________________________________
> Therion mailing list
> Therion at speleo.sk
> https://mailman.speleo.sk/listinfo/therion
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endscrap



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area water
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endscrap



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endscrap




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