Interesting John
With your model as posted I did not get
dual tubes with walls off although I did with walls on.
If you remove all of the point
passage-height and point dimensions from your scrap, then the behaviour of your
model seems to match the behaviour I described.
BTW I added my previous post to the wiki
examples page http://therion.speleo.sk/wiki/doku.php/examples#loch_models_paperless_survey_plan_scraps_and_lrud
Not able to spend more time on this just
now (winter sniffles-back to bed), but seems like point dimensions and point
passage-height changes the behaviour.
A semi automated way of enabling therion
to produce accurate model passage heights using splay shots would be useful,
and it seems like Footlegs proposal might be convenient (for those of us who
don’t have to write the code).
Bruce
From:
therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of John Stevens
Sent: Wednesday, 24 July 2013 7:03
a.m.
To: '
Subject: Re: [Therion]
Bruce a very useful article but it
differs from my experience in a couple of ways.
I thought a couple of months ago I would
try and produce a reasonable 3d model of a cave. So I surveyed a short section
of passage with more data than I could possibly normally use. I set stations at
5m intervals and took 8 wall measurements every 1m. This would get me a lot of
splays that I could then use as vertices for a 3d model (if I could find/write
some software to make the model, not done yet)
I could then compare this model with the
one Therion produces and see which extra splays are really needed.
Unlike your models I seem to get the
centreline tube in the middle (mostly) of the scrap tube. Unfortunately this
centreline tube often protrudes through the scrap tube, ruining the model. How
am I getting two tube? I have tried various options with walls
on/off/auto or commented out, to no avail.
I also found the Dimensions –value
[up, down] useful but it sometimes does unexpected things.
Passage Height was even worse for this.
If a single number was given it distributed the measurement above and below the
centreline. If + – was used it appeared on the plan but did nothing on
the model.
using Therion 5.3.11
This is a work in progress and your mail
has come at just the right time
Cheers
John