[Therion] Loop closure algorithms

[Olly Betts]

On Wed, Jul 19, 2017 at 10:30:19PM +0000, Saeid Bostandoust via Therion wrote:
> On Thursday, July 20, 2017 2:47 AM, Wookey via Therion <therion at speleo.sk> wrote:
> > Installing or not-installing survex switches the algorithm. Not sure
> > if there is a way of forcing one or the other algorithm without doing that..

You can specify in therion.ini with:

loop-closure therion

or:

loop-closure survex

"By default, survex is used if present, otherwise therion."

> is it better to install survex and using survex loop closure algorithm
> or not?

While I'm probably biased, the fact that the default is to use survex if
it's installed indicates that therion's authors think it's the better
choice.

There's also a third way (which is what I do), which is have your data
in .svx format, and just point therion at an already-processed .3d
file with "import example.3d":

https://therion.speleo.sk/samples.doc/40.html

Cheers,
    Olly