[Therion] new Therion 6.0.5

[Francesco Serafin]

Hi,

Thank you for the very useful "volume statistics" tool!

I was wondering: how is the volume computed in Loch?

Looking at Loch-generated models in Paraview, it seems to me that Loch
creates the volumes by joining every station to the splays radiating from
the previous and next stations, creating a sequence of pyramid-like solids,
like in this schematics:
[image: image.png]
(black=centreline shots, dashed grey=splay shots).
Does each of these "pyramids" contribute to the total with its own volume?
With this method, the mesh would contain intersecting volumes. To simplify,
if we imagine a cone with apex at the stations, the cones intersect:
[image: image.png]
How does the computation of the total volume deal with the intersections of
the cones?
Does it somehow avoid the double-counting coming from the intersecting
regions?

Thank you,
Best,
Francesco



On Sun, Feb 20, 2022 at 4:08 PM Tarquin Wilton-Jones via Therion <
therion at speleo.sk> wrote:

> "added support for cave volume calculation (Tools → Survey statistics)"
>
> Awesome addition.
>
> Could someone maybe explain what the difference is between 3D and LRUD
> envelope?
> I get how 3D probably works based on the rendered 3D view of the cave.
> But how can the LRUD thing work when I only use splays instead of LRUD?
> Does it just pick some particular or average splay and use it as a LRUD
> measurement? The results are so vastly different. Sometimes much bigger
> (one of my simple caves) sometimes much smaller ( a pothole).
>
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