Hi Bruce -
I am glad to hear someone else has seen this kind of problem. It is
really not much more than annoying since no one but me sees the .lox
files. I have CaveView on a web server, so I suppose that might count
as publishing the file.
I am using Therion 6.1.8 and Survex 1.4.5 running on Fedora 38. I
compiled Therion from source. Survex is the package the Jim Begley puts
in his COPR repository.
The Stark Caverns survey project has been going since December 2018. It
has been run through quite a few versions of both applications. Every
compile job builds the .lox file from scratch, so there should not be
any cruft from old versions.
And now I find something REALLY interesting! Mentioning CaveView in the
first paragraph reminded me that it is a full LOX viewer with no
dependency on Loch. Just for grins - I copied the latest Stark Caverns
LOX file over to that server and opened it up. No spike! The anomaly
is not there in CaveView. Take a look ...
https://campercaver.net/CaveView/my-index.html
and use the gear icon to choose the Stark Caverns file.
I think something odd is going on in Loch. What other applications can
open a .lox file? I gave it a quick try in MeshLab, but it does not
recognize .lox as a valid file type.
===============
Bill Gee
On 8/16/23 15:04, Bruce Mutton wrote:
One thing that strikes me is that the spike is not horizontal. It angles
upward by about 20 degrees.
Hi Bill
If it helps (unlikely), I have had a project where the Loch model has (had)
just such a spike, one hundred or so metres long, angling about 20 deg upwards.
For more than 10 years the model had this spike, and from time to time I tried
to troubleshoot it without luck. I have had other similar cases as well. I
looked up some outputs compiled January this year - it seems this spike is no
longer present. So there must have been a change in the algorithm in recent
years to resolve this. There has been no survey or drawing activity in that
part of the cave or model since about 2008-2010, but I concede that edits more
than 100 m away (from the spike) in the model could possibly have had some
effect.
I notice that other Loch rendering artifacts seem to have been resolved also.
Are you using a recent version of Therion?
I'm using 6.1.8, but unsure what it would have been in January.
Bruce
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