[Therion] Surface or Canyon walls

[Bruce Mutton]

Thanks Duncan and Martin
I was not aware of this distinction between the different (in)visibilities for wall behaviour.
I'll add it to the wiki page.

-----Original Message-----
From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Duncan Collis via Therion
Sent: Friday, 17 February 2017 5:04 PM
To: List for Therion users <therion at speleo.sk>
Cc: Duncan Collis <duncan.collis at gmail.com>
Subject: Re: [Therion] Surface or Canyon walls

On 15/02/2017, Martin Sluka via Therion <therion at speleo.sk> wrote:
>
>> 14. 2. 2017 v 19:30, Bruce Mutton via Therion <therion at speleo.sk
>> <mailto:therion at speleo.sk>>:
>> are used by the scrap join algorithm to decide which line ends to 
>> join (for visible wall lines only),
>
> For automatic scrap join algorithm. But you may join any kind of lines 
> at any line points - typically wall to corner of block

It's worth noting that there are two different ways of making a wall line invisible in Therion, which are treated differently by the automatic scrap join algorithm:

line wall -subtype invisible
   The wall line is not displayed, and will be ignored by the scrap join algorithm.

lne wall -visibility off
   The wall line is not displayed, but can be used by the scrap join algorithm when it chooses which points to join.

This caused me a fair amount of confusion until I figured it out!

Duncan.
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