I did this for some of my Matienzo surveys which I originally started
drawing in Tunnel before I moved to Therion when the process of morphing
old drawings onto new data became too time consuming as the project got
larger. The approach I took was to export the drawings from Tunnel as SVG,
then process these in Inkscape and save to Therion format using the Therion
Inkscape plug-in. The main pitfall I found was that the 'click to place
line points' method of drawing splines in Tunnel had led to much denser
points per line than typically is the case when drawing in Therion with the
'click and drag out handles' method with bezier curves. I found I tended to
get many short line fragments from the conversion, and tiny line
fragments overlapping themselves or hidden under other lines. Cleaning
these up was time consuming, and I eventually concluded I would get better
drawings by using bitmaps of my Tunnel drawings as background sketches in
Therion and redrawing them in Therion. Like many big survey projects where
nobody else seems interested in getting involved beyond the actual caving
trips it all proved too much work for me alone and after 10 years my
enthusiasm waned, so much remains to be drawn up still.
Footleg
On Wed, Jun 29, 2022 at 6:10 PM Wookey wrote:
> Has anyone done any work on the task of converting existing Tunnel
> sketches (xml) to therion .th2 files?
>
> CUCC (Cambridge Loser expeditions: https://expo.survex.com) has a huge
> investment of tunnel drawings (55km of cave?), but because there are
> no elevations for any of this and Tunnel is a bit niche we are
> pondering using therion more.
>
> If a semi-automated conversion of the existing drawings was possible, that
> would help enormously.
>
> It seems like it shouldn't fundamentally be too hard to turn xml
> lines/beziers into therion lines/beziers, and map the line types, but
> there are issues with how to allocate lines to files and how to get
> the scaling right.
>
> I've not done anything at all about it yet, but thought I'd check if
> anyone else had before having a proper look.
>
> Thoughts?
>
> Wookey
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