Hi Laurent, there is no chance, that +90 or -90 will be interpreted as front-back instead of north-south. Setting vthreshold to 91 or -91 is not possible. The default value for vthreshold is 60 degrees. As this is quite hot issue - I will try to change this strange behavior - I agree that NSEW is not a very good idea. Best regards, S. On 23 May 2012 13:21, cawa sorix <cawa.sorix@gmail.com> wrote:
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@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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