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 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. > > > > 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 âwallsâ 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 > > > _______________________________________________ > Therion mailing list > Therion at speleo.sk > http://mailman.speleo.sk/mailman/listinfo/therion >
