[Therion] Surface or Canyon walls

[Martin Sluka]

You are right, there are two kinds of behavior, so it should not be bug, but very important difference:

1. wall „-visibilty off" will create normal wall, just invisible.

2. wall "-subtype invisible“ will create dummy wall, just to restrict a scrap

Funny, I never think about it.

m.s.


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> 19. 2. 2017 v 9:21, Bruce Mutton via Therion <therion at speleo.sk>:
> 
> Too late. 
> In any case I don't think it looks like a bug.  I think the difference is a good thing, it gives valuable drawing options and the -visibility off for walls seems to be consistent behaviour with -visibility off  for other line types.
> 
> I'm not sure it affects clipping unless wall subtype outline is none.
> 
> Testing would to be good, just to be sure.
> 
> Bruce
> 
> -----Original Message-----
> From: Therion [mailto:therion-bounces at speleo.sk] On Behalf Of Martin Sluka via Therion
> Sent: Sunday, 19 February 2017 9:11 PM
> To: List for Therion users <therion at speleo.sk>
> Cc: Martin Sluka <martinsluka at mac.com>
> Subject: Re: [Therion] Surface or Canyon walls
> 
> Please, don't do it! It is evidently a bug. Invisible wall must not change the behaviour of clipping. In any case. 
> 
> I'll do one test more to see which way is correct. 
> 
> Martin
> 
> Odesláno z iPhonu
> 
> 19. 2. 2017 v 0:54, Bruce Mutton via Therion <therion at speleo.sk>:
> 
>> 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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