Yes, that was the intended behavior. As mention on a prior posting, the closed
curve option is only for esthetics – it displays a line to connect the first
and last points but coordinates on the first point is not added to the end of
the list. In GM one must avoid the chance that two points would have identical
coordinates as a deformation in their positions would require an infinite
amount of bending energy. However I could change the interpolation rule if
users request it.
F. James Rohlf, Distinguished Professor, Emeritus. Ecology & Evolution
Research Professor, Anthropology
Stony Brook University
From: J Coelho [mailto:joaopedrocoe...@gmail.com]
Sent: Sunday, February 26, 2017 3:41 AM
To: MORPHMET <morphmet@morphometrics.org>
Subject: [MORPHMET] tpsDig2 and closed curves
Greetings morphometricians,
I noticed a strange behaviour while attempting to obtain closed curves from
tpsDig2.
When I resample the curve, the first and last point remain fixed, and only
other points get repositioned. This is the correct behaviour for open curves.
However - to my understanding - in closed curves only one of these points (ex.
first) should be fixed.
To reproduce it, follow:
1. Options > Close Curve
2. Modes > Draw Curve
3. Now, draw anything you wish, ex. an ellipse.
4. Right click on your closed curve > Resample Curve
4.1 Input a far bigger number of points (I know, I know, but it's easier to
notice this way)
4.2 Chose [By Length] > Ok.
The distance between last and first landmark remains fixed. Again, a behaviour
I'd only expect in open curves. Am I wrong to expect the resampling to effect
all points except the first one in the specific case of closed curves??
Thanks in advance,
Best Regards,
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