[Therion] vthreshold

[Bruce]

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

-----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