[Therion] Loch passage tube behaviour

[Footleg]

A very useful account of the various options Bruce. Well worth adding to
the wiki!

I will experiment with some of my caves were I have LRUD data but have not
entered it into Therion to see if I can improve my models.

Footleg


On 20 July 2013 23:12, Bruce <bruce at tomo.co.nz> wrote:

> **
>
> Footleg****
>
> I think the answer is ‘yes’.****
>
> Hopefully you can view the images embedded in the image rather than
> attached, otherwise this won’t make much sense.****
>
> ** **
>
> In this example there is a single centreline (comprising both cave and
> surface survey) and 4 scraps.****
>
> A short section of cave at the left hand end does not have any scrap drawn.
> ****
>
> Compiled with Therion 5.3.11****
>
> ** **
>
> One interesting point is that regardless of the ‘walls’ setting, there is
> never a tube generated there once we have scraps drawn anywhere in this
> centreline.  My deduction is that Loch uses only one type of tube
> generation per centreline, because in almost all my larger projects that
> transition between traditional survey and paperless survey, I have a
> combination of each type of tube generation within the same **Loch**model.
> ****
>
> This fits with the description in the Therion Book****
>
> *“walls <auto/on/off>  turn on/off passage shape generation from LRUD
> data for*
>
> *subsequent shots. If set auto, passage is generated only if there is no
> scrap referencing*
>
> *given centreline.”*
>
> ** **
>
> In these examples I have not used any ‘point passage-height’ or ‘point
> dimensions’ in the scraps.****
>
> ** **
>
> ****
>
> Paperless survey (no LRUD), walls auto, off or on (or not specified), No
> plan scraps. [**Loch** always guesses tube dimensions]****
>
> -same if LRUD present and walls off****
>
> ** **
>
> ****
>
> Paperless survey (no LRUD), walls auto, off or on (or not specified), plan
> scraps drawn [**Loch** uses scraps for tube width and guesses tube height]
> ****
>
> ** **
>
> ** **
>
> Now, I added a few LRUD to the same centreline, including some with only UD
> ****
>
> ** **
>
>   data dimensions station left right up down****
>
>   1.4 - - 20 20****
>
>   1.5 - - 20 20****
>
>   1.6 2 2 20 20****
>
>   ****
>
>   3.13 10 10 20 20****
>
>   3.14 10 10 20 20****
>
> ** **
>
> Tube generation, where it occurs extends one station beyond those
> specified.****
>
> ** **
>
> ****
>
> Paperless survey (some LRUD), walls on or auto (or not specified), No plan
> scraps. [**Loch** uses LRUD for tube dimensions and only for stations
> where partial data is provided, it guesses the missing data   ie if a
> station has no data, no tube is generated]****
>
> ** **
>
> And now adding some scraps and things get interesting.****
>
> ** **
>
> ****
>
> Paperless survey (some LRUD), walls off (or not specified), Plan scraps
> drawn. [**Loch** uses scraps, not LR, for tube plan dimensions, and UD
> for height where specified, otherwise height is guessed.  Where there are
> no scraps, LRUD is *not* used.]****
>
> That is perhaps contrary to what one might expect from the Therion Book
> ‘walls’ entry.  It also produces perhaps the best model.****
>
> ****
>
> Paperless survey (some LRUD), walls on or auto, Plan scraps drawn. [**Loch
> ** uses scraps AND LR for tube plan dimensions, and UD for height where
> specified, otherwise height is guessed.  Where there is no LR, then it is
> guessed. Where there are no scraps, LRUD *is* used.]****
>
> ** **
>
> If I change the LRUD definition like this…****
>
> ** **
>
>   data dimensions station up down****
>
>   1.4  20 20****
>
>   1.5  20 20****
>
>   1.6  20 20****
>
>   data dimensions station left right up down  ****
>
>   3.13 10 10 20 20****
>
>   3.14 10 10 20 20****
>
> ** **
>
> ..then the guessed width troubles continue.****
>
> ****
>
> Paperless survey (some LRUD), walls on or auto, Plan scraps drawn. [same
> as above]****
>
> ** **
>
> So my final conclusion, for paperless survey, no need to include walls
> statements in each survey, or if you do, walls off is better than on or
> auto. If you happen to provide some UD data, then your model will be
> improved (more realistic).****
>
> ** **
>
> I surmise that with these same settings, scraps with point passage-height
> or point dimensions will have a similar effect, but I have not tested this.
> ****
>
> ** **
>
> Bruce****
>
> ** **
>
> ** **
>
> _______________________________________________
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>
>
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