Landmark Placement in Geomorph

[morphmet_moderator]

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Date: Sat, 12 Apr 2014 02:48:13 -0700
From: morphmet_modera...@morphometrics.org
Reply-To: morphmet_modera...@morphometrics.org
Subject: Landmark Placement in Geomorph
To: morphmet@morphometrics.org

----- Forwarded message from "Greiner, Thomas" <tgrei...@uwlax.edu> -----

Date: Mon, 31 Mar 2014 14:21:40 -0400
From: "Greiner, Thomas" <tgrei...@uwlax.edu>
Reply-To: "Greiner, Thomas" <tgrei...@uwlax.edu>
Subject: Landmark Placement in Geomorph
To: Morphmet <morphmet@morphometrics.org>

I am trying to use the R geomorph package to place landmarks on a 3D object.

I read the ply image in fine and the object displays.

I use the mouse to draw a square around the location where I want to place a landmark, or "vertex" as it is described in the instructions. A landmark get placed, but it jumps through the object. It seems that the "vertex point" assumes a position that is on the surface of the object directly opposite to where I would want it positioned. So, I am having trouble placing these points at useful landmark positions. I am similarly unclear how drawing a square would allow placement of the landmark with any precision.

Perhaps the problem is that I do not fully understand what is meant by "vertex." I have been taking it to be a synonym for landmark. Operationally that appears to be incorrect, but I do not know how to proceed.

Any advice would be appreciated.

Thomas Greiner

tgrei...@uwlax.edu

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