[Therion] Vertical issue

[Stacho Mudrak]

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 at 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 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 – 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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