Hi, I had the same issue in my first topo, a workaround is to put 89° and no 90°, and vertical are vertical and LRUD are LRUD.
I never really understand how use vthreshold, it will be the next challenge maybe... Regards, Laurent. 2012/11/1 Marco Menchise <marco.menchise at gmail.com>: > 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: >> >> â¦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 âvthresholdâ. >> >> From the Therion Book⦠>> >> â >> >> vthreshold <number> <units> â 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 â 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 >> >> â >> >> I had thought the default value of vthreshold was 60 degrees, but it seems >> it may be around 67.5 degrees. >> >> >> >> Bruce >> >> >> >> >> >> >> _______________________________________________ >> Therion mailing list >> Therion at speleo.sk >> http://mailman.speleo.sk/mailman/listinfo/therion >> > > > _______________________________________________ > Therion mailing list > Therion at speleo.sk > http://mailman.speleo.sk/mailman/listinfo/therion >
