Bruce, thanks for you explanation.<div>It appears I missed to carefully read the Therion Book!</div><div><br></div><div>Marco<br><div><br></div></div><div class="gmail_extra"><br clear="all">Marco<br>
<br><br><div class="gmail_quote">On Wed, Oct 31, 2012 at 7:08 PM, Bruce <span dir="ltr"><<a href="mailto:bruce@tomo.co.nz" target="_blank">bruce@tomo.co.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">











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<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Marco<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I tested your example and got the result
you described with both xvi and pdf outputs.<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I think you have found the transition
defined by ‘vthreshold’.<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">From the Therion Book…<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">“<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">vthreshold <number> <units> </span></font><font color="navy" face="Lucida Sans Unicode"><span style="font-size:10.0pt;font-family:"Lucida Sans Unicode";color:navy">◃</span></font><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"> threshold for interpreting LRUD readings as left-right-front-back
reading perpendicular to the shot.<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">If passeges are horizontal (inclination
< vthreshold), LR is perpendicular to the shot and UD is vertical.<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">If passages are more or less vertical
(inclination > vthreshold), even 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<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">“<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">I had thought the default value of
vthreshold was 60 degrees, but it seems it may be around 67.5 degrees.<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></font></p><span class="HOEnZb"><font color="#888888">

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Bruce<u></u><u></u></span></font></p>

<p class="MsoNormal"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>

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