[Therion] Wall visibility affecting lox model

[Footleg]

Hi Bruce,

That explanation makes a lot of sense. 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 wal sub types. 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.

Footleg

On 11 May 2012 22:16, Bruce  wrote:
> Footleg (and others)
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> This is how I think therion might be intended to behave, these are my
> guesses, so please comment if I am wrong.
>
>
>
>
>
> wall:invisible (or ‘wall subtype invisible’ is exactly equivalent)
>
>
>
> means 'wall does not exist'.  Ie Use this syntax to show that this is the
> boundary of the interior of the passage for this scrap 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
>  http://therion.speleo.sk/wiki/doku.php?id=tbe:wiki3[]=join#joining_scraps
> to fill in the blank.
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> Is this an OK explanation?
>
> Bruce
>
>
>
>
>
>
>
>
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[Therion] Wall visibility affecting lox model

[Bruce]

Hmm
Something is happening to the lox model wall a little remote from the wall
you are changing.  Intriguing.  
I added 
-layout-colour map-fg [97 86 38]
to the export of the pdf, to check what therion interpreted as inside and
outside.  All seems OK.

I cannot see any problem with -reverse or -outline settings, but I did not
check exhaustively.
I cannot imagine that superposed ceiling step lines would make any
difference (They are not rendered in loch so I presume they are ignored). 

Only style thing that you do different to I is that you seem to start a new
line each time you change the subtype, where as I tend to use long lines and
change the subtype from invisible to bedrock or clay or whatever at internal
points.  This makes it less likely that you 'lose' underlying lines.  Should
make no difference to the characteristic we are discussing.

As far as I can see the file with all wall:invisible should be good, but it
is not.  I have perhaps similar issues with many of my scraps rendering in
loch, and I have just put it down to bugs that will be fixed in due course.

I'm done.  Someone else?

Bruce


-Original Message-
From: therion-bounces at speleo.sk [mailto:therion-boun...@speleo.sk] On Behalf
Of Footleg
Sent: Thursday, 10 May 2012 8:12 a.m.
To: List for Therion users
Subject: Re: [Therion] Wall visibility affecting lox model

There are other wall:invisible lines in my scrap. It is only when I
switch one of them to wall:invisible from visibility off that my lox
model walls are all rendered OK. The others are still wall:invisible
but these also have identical lines of type ceiling step running along
the same path. Maybe that makes a difference?

I've attached a mini project with the two versions of my ths file. One
gives a good lox model, and one does not.

Footleg

[Therion] wall + loch

[Marco Corvi]

played with footleg example,
stripped down even further.
looks like the issue has something to do with pit outline in touching the wall 
(no outline spec).
might be a bug with loch or lox export. must leave this to stacho
marco

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