[Therion] new Therion 6.0.5

[Stacho Mudrak]

Hi Francesco,

do you have some minimal sample, where these pyramids are created?

It looks to me like a bug and I should investigate this issue. Normally -
only a 3D envelope of splay shots from each station should be created.
Splays from other stations should not be taken into consideration.

Thanks, S.

On Sun, 20 Feb 2022 at 23:07, Francesco Serafin <
francesco.serafin2 at gmail.com> wrote:

> 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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