I don't know how to do this from within Caret, but I use:
SURFACE GEODESIC DISTANCE
caret_command -surface-geodesic
<surface-coord>
<surface-topo>
<output-metric>
<smoothed>
[-node node-number]
Generate the geodesic distance from all nodes to all other nodes
unless a node number is specified in which case the distances are
output for the specified node to all nodes.
Uses dijkstra's algorithm with reuse of information from previous
root nodes. If smoothed is 'true', it traces paths over adjacent
triangles in order to generate distances for some 2hop neighbors.
This causes the contours of equal distance to be closer to
circular,
and also makes the distances more consistent for a mesh which has
been streched nonuniformly. It is almost as fast as unsmoothed.
surface-coord the surface coord file
surface-topo the surface topo file
output-metric output metric file for geodesic distance
smoothed output smoothed distances by using 2hop
neighbors
Run "caret_command -help-global-options"
for parameters available to all commands.
Make sure you specify a node number (and used smoothed true) or you will get
all to all geodesic, which will be enormous for a surface of more than a few
tens of thousands of nodes. Then load the output metric column in Caret and
click on the other node of interest to see the metric value at that point.
That will be your geodesic distance between the two nodes. I don't know why
you would want to calculate distance on an inflated surface, however, as
this will be significantly distorted relative to the original surface.
Better to use the original midthickness surface to get an accurate value.
Peace,
Matt.
_____
From: [email protected]
[mailto:[email protected]] On Behalf Of Ido Davidesco
Sent: Wednesday, December 08, 2010 9:25 AM
To: [email protected]
Subject: [caret-users] Geodesic distance
Hello,
I`m a new user of Caret.
I`d like to calculate the geodesic distance between 2 points on an inflated
surface, which was created in BrainVoyager.
I was able to load the surface in Caret. However, the Geodesic page is
missing in the display control dialog.
Is this option available when the surface was not created in Caret?
Thanks,
Ido
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