[Therion] vthreshold

Andrew Atkinson andrew at wotcc.org.uk
Tue May 15 23:54:18 CEST 2012



On 15/05/12 21:37, Bruce wrote:
> I also do as Xavier describes, and agree that compass bearing (even if clino
> is vertical) seems to be the logical way to orient LRUD.
> Bruce

Orientating to the passage has always been most logical to me, but I do 
see that the above is very valid. However what do you do on a true 
vertical, as it does not have a compass bearing?
>
> -----Original Message-----
> I completely agree with you that NSEW is not not a good way to measure
> the shape of about-vertical passages. In fact I personally never measure
> dimensions in NSEW directions but in the direction of the shot (or of
> the preceeding shot if it is absolutely vertical), in the reverse
> direction, on its right and on its left. I use LRUD with Up meaning in
> the (horizontal direction of the shot and Down the opposite.
>
> As we have to give a bearing anyway for vertical shots, why not use it
> to orient the dimensions instead of a vthreshold-offset that should be
> changed for each new shot?
>
> Xavier
>
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