[Therion] Big room multiple scraps - How to join

[Bill Gee]

Update:  Thank you everyone for suggestions.  I think I have conquered 
(more or less) this problem by using some invisible walls.  Results at

https://campercaver.net/MiscFiles/StarkCavernsNoCenter-1.pdf

For comparison the old map is still there:

https://campercaver.net/MiscFiles/StarkCavernsNoCenter.pdf

There is some overlap which shows in the background coloring.  The 
overlaps are a bit darker than the rest.  I am not too concerned about 
that.  It is not a rocket ship - Does not have to be perfect.

There are no new join statements.  I just added invisible walls to the 
scraps

I did have scraps wider than deep, which several people pointed out is a 
problem.  I checked all the wall orientations, as Bruce suggested.  They 
were all correct.  My habit is to draw walls counter-clockwise which 
should result in correct orientation.

As Tarquin pointed out - We should have surveyed the whole room before 
we surveyed the room.  Hindsight is 20/20!  Next time I know better. 
That does fly in the face of a common American caving practice which is 
to survey as you go.  Scooping is frowned on.  Sometimes, though, you 
really need to scoop the passage before taking survey shots.

Of course I found a new problem!  That will be another thread.

===============
Bill Gee

On 8/2/23 15:05, Bruce Mutton wrote:
> Bill
> As Tarquin points out, looks to me like scraps with openings wider than the
> scrap is long.  The solution is invisible walls along the interior joins.
> Another thing to check is that all the walls have the correct orientation -
> all the left-side yellow ticks point to the interior of the passage (if not
> for pdf outputs, it still helps for models).
> And that wall -outline is set correctly to out, in or none.
> 
> Bruce
> 
> -----Original Message-----
> From: Therion <therion-bounces at speleo.sk> On Behalf Of Bill Gee
> Sent: Thursday, 3 August 2023 03:28
> To: Therion Mail List <therion at speleo.sk>
> Subject: [Therion] Big room multiple scraps - How to join
> 
> Hello everyone - I am having a problem getting Therion to understand how to
> join several scraps to make a large room.  The working map is at
> 
> https://campercaver.net/MiscFiles/StarkCavernsNoCenter.pdf
> 
> Take a look at the east part of the map in an area called Grand Canyon.
> This is really one large room, though we did not realize that when we
> started sketching several years ago.  Now I have at least three different
> pieces of sketch to try and fit together.
> 
> As you can see, there is a large triangle in the center which Therion thinks
> is not cave.  There are also some part which are outside the cave, but are
> considered by Therion to be inside.
> 
> All of the joins in here are using line-to-line.  I named the lines, then
> created "join" statements specifying the two lines and which points on those
> lines to join.  Therion is happy with that, and the wall that it draws is a
> fair depiction of the area.  The problem is that much of the interior is
> getting lost.
> 
> I have not tried to use plain joins of the scraps - joins which do not
> specify the lines.  I suspect that would not change much.
> 
> I have already drawn some of this area three times.  It is extraordinarily
> complicated due to multiple levels, especially along the east side.  We
> thought for a long time that the east side was separate passages, but it is
> really just a complicated pile of big breakdown blocks.
> 
> I really REALLY do not want to go back and make one huge sketch of the
> entire room.  That would take several days.
> 
> What can I do to convince Therion where the cave really is?  Can I put in
> some invisible walls (subtype hidden)?
> 
> Thanks!
> 
> --
> ===============
> Bill Gee
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