[Therion] new Therion 6.0.5

[Stacho Mudrak]

Hi,

this is just the first iteration of volume calculation. It calculates the
volume of either the 3D model created from the LRUD envelope or the volume
of scrap 3D models.

If there are splay shots in the dataset - currently this creates 2 problems:

1. 3D envelopes of survey stations are mixed and exported as regular map
scraps - a new version of LOX file needs to be created to separate them.

2. they overlap with map scraps and also each other - therefore volume is
several times overestimated.

So far, if you have splay shots in your datasets, to get some reasonable
numbers, you should:

1. export 3d model with "-wall-source maps" -> this will create 3d model
consisting only of scraps from maps and then scraps 3d volume should be
more or less OK, LRUD will be 0

2. export 3d model with "-wall-source centerline" -> then only LRUD
readings will be used. You may use "Tools/Options/Extrapolate all missing
wall information" to add LRUD envelope where it is missing.

Unfortunately, there is no easy way of calculating volumes from splay
shots. There is a new version of LOX file format missing and some 3D union
algorithm.

S.






On Mon, 21 Feb 2022 at 00:37, Bruce Mutton <bruce at tomo.co.nz> wrote:

> “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.”
>
>
>
> My inference is that if you enter LRUD for a piece of passage, that is
> used to calculate volume, and if you have splays, those are used.  Hence
> the result just follows the type of data entered.  My datasets usually
> result in one or the other being zero, because they only have either splays
> or LRUD.  Some datasets have only a few LRUD and many kilometres of
> splays.  These naturally (and presumably appropriately) report volumes with
> orders of magnitude difference.
>
>
>
> Bruce
> _______________________________________________
> Therion mailing list
> Therion at speleo.sk
> https://mailman.speleo.sk/listinfo/therion
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20220222/2af9b23f/attachment.htm>