[Therion] Vertical issue

[cawa sorix]

Hi Bruce,

Thanks for your quick answer.

In fact I found vthreshold threads, and I tested different values for
that parameter without any change. It seems default value is -90 90
and it not possible to choose 91 or a wild cart.

I will change every vertical values to 89.9 and I try to draw my cave.
Is there any evolution plan on the todo list about this subject ?

Laurent.

Thanks developers for yours job.

2012/5/22 Bruce <bruce at tomo.co.nz>:
> Laurent
>
> Welcome to the list.
>
>
>
> As the gradient of a survey shot increases, therion switches from the
> assumption that passages are measured LRUD to an assumption that they are
> measured LR-front-back and then at 90 deg to NSEW.  At present the user has
> some control of this, but not complete control.
>
> From the therion book (and slightly rephrased by me)...
>
>
>
> vthreshold <number> <units>  threshold for interpreting LRUD readings as
> left-right-front-back reading perpendicular to the shot.
>
> If passeges are near horizontal (inclination < vthreshold), LR is
> perpendicular to the
>
> shot and UD is vertical.
>
> If passages are near vertical (inclination > vthreshold), UD becomes
> perpendicular to the shot – otherwise passages would not look very good.
>
> In the case of vertical shots, UD is interpreted as north-south dimension
> from the station to allow tube-like modelling of verticals.
>
>
>
> It is the feature in the last sentence which is upsetting your output.   You
> may have noticed the recent posts discussing the merits or otherwise of this
> behaviour.
>
> I have never concerned myself much with this, as my focus is cartographed
> drawings, not models, so I just ignore the spurious ‘walls’ at pitches.
> Hence this advice might not be perfect.  Try using 89.9 deg in place of 90
> deg as a workaround.
>
>
>
> Incidentally, does anyone know what the default value of vthreshold is?
>
>
>
> Bruce
>
>
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