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@tomo.co.nz> wrote:
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…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.****
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You can control the inclination at which the first change occurs by adding ****
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vthreshold 40 degrees ****
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to your centerline block of data.****
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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.****
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Bruce****
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*From:* therion-bounces@speleo.sk [mailto:therion-bounces@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****
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Marco****
I tested your example and got the result you described with both xvi and pdf outputs.****
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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.****
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Bruce****
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