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

[Bruce Mutton]

Hi Michael
Unless Stacho's magic fixes your problem, I would expect that it is most
likely that the yellow tick marks do not point inside of the passages in all
cases, or -outline in/out is not set correctly.  Your example image is
exactly the sort of thing that first time kml users produce.  It is very
common.
There should not be any problem with many short wall lines, except that with
many, there is more opportunity to get a yellow tick or -outline wrong.

A couple of months ago I encountered a case where ends of two adjacent
scraps were one above the other, and one of them was well rendered, and the
other as in your example.  Turned out that both scraps were drawn correctly
and simply moving one of the end lines a bit fixed the problem.  Have never
encountered that before as far as I know, and I would expect that this is
unlikely to be your problem.

Have a look at
https://therion.speleo.sk/wiki/tips#avoiding_invisible_or_misshapen_scraps_i
n_loch_and_google_earth It is a bit outdated now, as I think the behaviours
are different now, but it gives you an idea of what to look out for.

When troubleshooting this sort of thing, also produce pdf outputs with a
passage foreground colour.  This can point to problems with gaps between
scraps and incorrect yellow ticks (interior of passage), but will not
identify -outline errors (because the pdf generator seems to reliably know
better than the user!)

Bruce


-----Original Message-----
From: Therion <therion-bounces at speleo.sk> On Behalf Of Michael Ross
Sent: Tuesday, 20 April 2021 02:20
To: therion at speleo.sk
Subject: [Therion] Need help producing scraps.kml without white blobs

Hello there,

I "own" a fairly large dataset of a maze cave.
Producing PDF output works well,
but when producing kml using

  export map -projection plan      -output Scraps.kml

I get large white blobs where there should be transparency. See attachment.

First assumption was that Therion needs some help by marking certain walls
"outline in".
But that didn't help.

Then I tried redrawing the walls of the affected passages to get long lines
of walls rather than concatenated short sections of walls, assuming that
would help Therion to better understand.
Didn't help.

Anyone had this problem so far?

If there is a way to post-process the kml file to remove the white areas,
that would also help.

Or any other hint to systematically track this down.

Kind Regards,
Michael