[Therion] Surface or Canyon walls

[Martin Sluka]

You are right

There is a short wall which has different setup of subtype and visibility

1. without command join

2. with join subtype invisible

3. with join visibility off

But on other hand this is not standard use of invisible wall. It is used to „close“ outline of scraps if there is too wide space between ends of walls or a morphology outside of regular cave should be visible (cave entrances), usually


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without join:
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join wall subtype invisible

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 with join visibility off
  
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m.s.

> 17. 2. 2017 v 5:03, Duncan Collis via Therion <therion at speleo.sk>:
> 
> 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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