[Therion] Two scraps in the same .TH2

[Rodrigo Severo]

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