On Sun, Mar 01, 2020 at 09:34:32PM +0000, Tarquin Wilton-Jones via Therion
wrote:
> > 1) Is it possible to export an extended elevation as a 3D file (like
> > survex does)? For the purpose of 'debugging' the extends etc.
>
> I doubt this is entirely possible. There are some kinds of extend
> options that Therion supports but Survex does not, such as "extend
> vertical". So I don't think you could turn it into a Survex-style 3D if
> you use those options.
An "extended elevation" .3d file is really just a normal .3d file with
a flag set (as of v8 of the .3d format there's an explicit flag, while
for older versions it's done by checking for a title ending
" (extended)"). If this flag is present, aven limits the view to be an
elevation looking North or South.
The Survex extend program folds the centreline to lie in an East-West
vertical plane through the origin, with splays rotated along with the
centre-line they're adjacent to but allowed to stick out of this plane.
There's no explicit representation of the extend operations which were
applied, only of the results, so "extend vertical" shouldn't be a
problem. I can't think of an extend-like feature which couldn't be
easily fitted into this "2D+" representation.
Cheers,
Olly
_______________________________________________
Therion mailing list
Therion@speleo.sk
https://mailman.speleo.sk/listinfo/therion
