Don, can you send your command line? If you are using surface-based
registration, then the origin should not matter. You are right that
there is not a one-to-one correspondence. The way it works is that it
starts on the target surface, goes through all the vertices and finds
the closest vertex in the source and maps the value. At this point, each
target only has one source, but each source may have multiple targets.
By default, it then goes through another loop where it finds all the
source vertices that have not been mapped, finds the closest target
vertex, and maps the source to that target (eventually taking the mean
or sum of all the sources that map to a given target). If it is the 2nd
stage that is giving you problems, then you can turn it off in
mris_apply_reg with --nnf (stands for "nearest-neighbor-forward", vs the
default nnfr where r=reverse).
On 12/3/2021 8:41 AM, Krieger, Donald N. wrote:
External Email - Use Caution
Dear Bruce, Doug, and everyone,
1. I am projecting labels from a subject’s labels onto the
icosahedron and note that the mapping is not one-to-one. Because
of this, I cannot tell which subject vertex maps to which
icosahedron vertex which I need to able to do. What am I missing here?
2. Just double-checking something simple – The center of the
icosahedron is as the origin, i.e. 0,0,0, yes?
Thanks – Don
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