[Therion] Additional morphing points (type "extra") explained

[Martin Sluka]

The purpose of this feature was to correct field sketches to LRUD for example.

m.

On Nov 18, 2016, at 03:47 PM, Benedikt Hallinger <beni at hallinger.org> wrote:

Thank you very much!

The extra point then just basicly just indicates "this *known* point is xx 
meters away from point y"; as is the (implicit) same for the LRUD data.
In other words, the LRUD data generates implicitely such points if present.

Just to clarify (and for the archive):
To correct an arbitary wall between two long survey legs, i would place two 
extra points at the middle of the leg at the position where i have drawn my 
wall signature. Then i would enter the "-from" info and the respective -dist 
to that point.

I just tested this and it works like desired, however it involves a little 
fiddling.


Thanks again for clarifying this!




Am 2016-11-18 14:13, schrieb Xavier Pennec:
According to the therion book (p. 25), extra points can also be used
without LRUD by specifying the distance to either the closest station of a
specific station, e.g.: point 0.0 0.0 extra -dist 3 -from 2 at mysurvey
I have not tried yet, though.

Xavier

Le 18/11/2016 11:52, Benedikt Hallinger a écrit :
Thank you for the fadt reply.
If i understand and interpret correctly, the behavior unfolds in the
following way:
- when i detect inproper morphing of walls compared to lrud data
- i place "extra" points on my traced wall signature.
- the extra point position is approximately where the lrud point is
assumed to be on the wall.
- when rendering, therion morphes the wall to match the extra point
position to the corresponding lrud position for that point (which is the
nearest station).

That would imply:
a) there is no use for extra points without lrud data.
b) extra points reference l+r positions of lrud data of the nearest
station, therefore it is not possible to set more than two extra points per
station.

Is the above true?



Am 2016-11-18 11:20, schrieb Martin Sluka:
18. 11. 2016 v 8:07, Benedikt Hallinger <beni at hallinger.org>:

Hello,
i struggle to understand how the extra morphing points are meant to be
used.

How do they work technically? How do i correctly set them?
Are they linked to the nearest station and could i use more than two
extra points?
Are they linked to LRUD data?

I already investigated the "morohing" example from the documentation
(both in code and in thbook), so i think it would be good to stick to
this example.

Thank you very much!
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Hi Benedikt,

the purpose of these extra points is to correct differences between LRUD
data (if available) and distances to walls in sketches.

Check page 89 of TherionBook.

m.

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Xavier Pennec
Senior Research Scientist / Directeur de recherche
Asclepios project-team, INRIA Sophia-Antipolis
2004 Route des Lucioles, BP93
F-06902 Sophia-Antipolis Cedex, France
+33 4 92 38 76 64
+33 6 78 35 16 90
http://www-sop.inria.fr/asclepios/
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