[Therion] FW: Doubt about vertical sections

[Marco Menchise]

Thanks for the clarification.
I admit to have missed the point, the test I made some time ago when
starting using Therion were not enough accurate to show the vthreshold
limit.

Marco


On Thu, Nov 1, 2012 at 9:48 AM, Bruce <bruce at tomo.co.nz> wrote:

> **
>
> …so to clarify further …****
>
> As the gradient of a survey shot increases, therion switches from the
> assumption that passages are measured LRUD (vertical up down) to an
> assumption that they are measured LR-front-back (up down perpendicular to
> the passage orientation) and then at +-90 deg to the assumption that they
> are measured NSEW.****
>
> ** **
>
> You can control the inclination at which the first change occurs by adding
> ****
>
> ** **
>
>     vthreshold 40 degrees ****
>
> ** **
>
> to your centerline block of data.****
>
> ** **
>
> Unfortunately we cannot change the NSEW behaviour (yet).****
>
> What you need to know of course, is approach the surveyors took when they
> were collecting the data, and adjust your input accordinly.****
>
> ** **
>
> Bruce****
>
> ** **
>  ------------------------------
>
> *From:* therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] *On
> Behalf Of *Bruce
> *Sent:* Thursday, 1 November 2012 7:08 a.m.
> *To:* '**List for Therion users**'
> *Subject:* Re: [Therion] Doubt about vertical sections****
>
> ** **
>
> Marco****
>
> I tested your example and got the result you described with both xvi and
> pdf outputs.****
>
> ** **
>
> I think you have found the transition defined by ‘vthreshold’.****
>
> From the Therion Book…****
>
> “****
>
> vthreshold <number> <units> ◃ threshold for interpreting LRUD readings as
> left-right-front-back reading perpendicular to the shot.****
>
> If passeges are horizontal (inclination < vthreshold), LR is perpendicular
> to the shot and UD is vertical.****
>
> If passages are more or less vertical (inclination > vthreshold), even 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****
>
> “****
>
> I had thought the default value of vthreshold was 60 degrees, but it seems
> it may be around 67.5 degrees.****
>
> ** **
>
> Bruce****
>
> ** **
>
> ** **
>
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