[Therion] Need help producing scraps.kml without white blobs

[Tarquin Wilton-Jones]

Hi Michael,

> but I'm happy to provide the complete data to anyone who is willing to
> dive into this problem.

Certainly I would be happy to help dissecting a survey to work out
what's going wrong. So do share if you are comfortable doing so.

One thing I immediately notice with your survey is that you seem to
expect a scrap to have two outlines, which is not permitted. Near the
southern end - where I see a white overlap in Google Earth due to the
underlying passage - you end one passage, then start a new one on the
far side of the pitch, without starting a new scrap. This happens at the
junction in the north as well.

If you were hoping to have two separate outlines there, then you need
separate scraps. If not, then you are going to get a weird overlap
anyway with the passage above and below both showing at the same time.

In the middle of the scrap, your "-outline in" oxbow also is incomplete
(the part that appears as a huge chamber in KML). Close off the open
passage end with a wall, set to "-outline in -visibility off". I don't
know if that will fix it, but it might.

Further north, you start a passage inside the other passage, which
causes another overlap. That may be correct if the passage does indeed
pop out part way inside the outer wall of the other passage. But if you
want to avoid that overlap, join the scrap walls to each other so that
the passages do not overlap.

The northern-most junction is a mess of overlaps, because you have ended
the passage with it open at each side passage, and none of them extend
through the junction in between. This is not unique to KML. If you
render your cave with a background colour in PDF, you will see the same
problem. One passage needs to "own" the junction. Meaning it must have
an outline that extends fully around the junction (or you can use
horrendous joins and have passages each owning parts of the junction).
Use invisible borders with "-outline out" if you need to, in order to
extend one of the passages through the junction so that it owns the
passage. This particular situation is covered very nicely in Footleg's
tutorial:
http://wscc.darkgem.com/footleg/therion/Therion%20Tutorial%2015thMar2016.pdf
Lesson 9

Does this help fix the problems you are seeing?

Cheers,

Tarquin