We have a couple of commands you can use to do this:
:~$ wb_command -surface-geodesic-distance
COMPUTE GEODESIC DISTANCE FROM ONE VERTEX TO THE ENTIRE SURFACE
/home/brainmappers/workbench/fetchdir/wb_command
-surface-geodesic-distance
<surface>
<vertex>
<metric-out>
[-naive]
[-limit]
<limit-mm>
Unless -limit is specified, computes the geodesic distance from the
specified vertex to all others. The result is output as a single
column
metric file, with a value of -1 for vertices that the distance was
not
computed for. If -naive is not specified, it uses not just immediate
neighbors, but also neighbors derived from crawling across pairs of
triangles that share an edge.
Descriptions of parameters and options:
<surface> - the surface to compute on
<vertex> - the vertex to compute geodesic distance from
<metric-out> - output - the output metric
[-naive] - use only neighbors, don't crawl triangles (not
recommended)
[-limit] - stop at a certain distance
<limit-mm> - distance in mm to stop at
:~$ wb_command -surface-closest-vertex
FIND CLOSEST SURFACE VERTEX TO COORDINATES
/home/brainmappers/workbench/fetchdir/wb_command -surface-closest-vertex
<surface>
<coord-list-file>
<vertex-list-out>
For each coordinate XYZ triple, find the closest vertex in the
surface,
and output its vertex number into a text file.
Descriptions of parameters and options:
<surface> - the surface to use
<coord-list-file> - text file with coordinates
<vertex-list-out> - output - the output text file with vertex numbers
Peace,
Matt.
On 11/6/13 9:14 PM, "David R. Haynor" <[email protected]> wrote:
>hi hcp-users,
>
>is there a relatively easy way to get an estimate of the distance *on the
>pial surface* of two voxels that are on the surface? i.e. i want the
>distance on the cortical sheet, not the 3D distance through space.
>
>thanks.
>
>-dh
>
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