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<p class=MsoPlainText><font size=2 face="Courier New"><span lang=EN-NZ
style='font-size:10.0pt'>Footleg (and others)<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Just some musings about how 'wall
subtype invisible' and 'wall -visibility off' are intended to be used. It
seems Footleg is wanting a wall linetype that does not exist, and so quite
sensibly making his wall invisible in some way (so therion knows where the
passage interior is), and then overlying his wall with the line type he wants
(ceiling step, chimney, whatever). Clever.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Aside from the loch issues my
experiences with pdf and kml outputs suggest that unless you do this right
there will be problems in some cases.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>This is how I think therion might
be intended to behave, these are my guesses, so please comment if I am wrong.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>wall:invisible (or ‘wall
subtype invisible’ is exactly equivalent)<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>means 'wall does not
exist'. Ie Use this syntax to show that this is the boundary of the
interior of the passage <u>for this scrap</u> but it is NOT a wall. Eg A
passage branches off here and there is an open end (wall:invisible required if
the open end is wider than the passage/scrap width) or there is a junction at
the end of the scrap where three or more passages join, and you need to help
therion understand that the ‘blank polygon’ inside the junction is
in fact inside the passage, and you don’t want to (or cannot) use the
solution here </span></font><span lang=EN-NZ><a
href="http://therion.speleo.sk/wiki/doku.php?id=tbe:wiki3&s%5b%5d=join#joining_scraps">http://therion.speleo.sk/wiki/doku.php?id=tbe:wiki3&s[]=join#joining_scraps</a>
to fill in the blank.<o:p></o:p></span></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Therions scrap ‘join’
statement (default usage) ignores walls with subtype invisible (as if they don’t
exist) and so this is where Footlegs workaround for unsupported wall linetypes
could come unstuck. Some really odd joins could manifest, requiring the
user to adopt the more tedious explicitly defined line by line joins.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Therefore if you have a case
where there really is a wall, but you want a work-around to get a different
linetype, then wall – visibility off is probably what you should be
using.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Is this an OK explanation?<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'>Bruce<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=black face="Courier New"><span
lang=EN-NZ style='font-size:10.0pt;color:black'><o:p> </o:p></span></font></p>
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