[Therion] Wall visibility affecting lox model

[Bruce]

>It also highlights that really
>I want an option to treat any line type as a wall, rather than having
>to use one of the limited set of wall sub types. 

I have also wondered this - I guess it's a matter for the authors to comment
on.

>Is there any reason
>why I shouldn't be allowed to have a wall that renders like a ceiling
>step line in my PDF? This is generally how I have always drawn avens
>where some of the wall of the aven is also effectively the passage
>wall.

Me too, except that I use the chimney symbology.  I have been planning to
write metapost to change the chimney symbol to the one we use in NZ (solid
wall line with dots on outside of the passage) and then make a request to
the authors for a wall subtype chimney.  Perhaps a feature we could request
is;

line wall subtype context-<otherline>

where <otherline> is any other currently defined line type?

And back on the topic of -visibility.
>> 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.

Should admit I have not tested this to see if it behaves with joins the way
I think it would.

Bruce