Workbench does this internally, but it doesn't currently have a command to output it (the number of neighbors varies per vertex, so it could be hard to make efficient use of in something like matlab). The .surf.gii file has this information in it, in the triangles array, so if you load it, you just have to build a lookup based on that. Each triple in the triangles array is the vertices of a single triangle.
When we use neighbor information (things like gradient, where it needs to respond to as small a local neighborhood as possible), we also take the length of each edge and/or coordinates of each neighbor into account, since the triangles don't have to be close to equilateral. If we are doing something that uses larger spatial extent (smoothing), we instead use geodesic distances rather than single-hop neighbors, so that we get circular ROIs with distance information, regardless of the mesh topology. This is exposed for a single vertex at a time via wb_command -surface-geodesic-distance (the full matrix would be large and takes a while to compute, but it can be added if it would be sufficiently useful). Tim On Wed, Feb 28, 2018 at 1:22 PM, Shankar Tumati <shankar.tum...@theroyal.ca> wrote: > Hello experts, > > I would like to get a list of neighbors of each vertex in a 32k surface > file. How can I do this with workbench? If not with workbench, is there > another way to get this info? > > Thank you. > > Best, > Shankar > _______________________________________________ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
