Hi Victor
the sphere files are lh.sphere and rh.sphere in the surf dir. You could
write out the metric tensor (or first fundamental form) of the mapping to
compute Euclidean distances from spherical coordinates, or probably just
use the 3D euclidean distances on the sphere as the sampling is de
Thanks Bruce and Doug!
Bruce, I think the option of the sphere is the one that better fits my
needs, since I need to perform conv operations + derivatives. How should
address this issue? I am not very familiar with sphere files (nor metric
tensors) and do not know how to open/where to find those f
read_surf.m will read in a surface including the nearest neighbors. the
vertices are not ordered in an ordered way
On 11/28/2017 11:38 AM, Victor Montal Blancafort wrote:
> Dear Freesurfer experts,
>
> I would like to preform several operations in surface files using
> spatial kernels (i.e mean
Hi Victor
the order of vertices/faces is somewhat arbirtry. If you want to write out
a convolution I would do it on the sphere (and account for the metric
tensor of the chart functions), or flatten and do it in the plane.
cheers
Bruce
On Tue, 28 Nov 2017, Victor Montal Blancafort wrote:
> Dea
Dear Freesurfer experts,
I would like to preform several operations in surface files using spatial
kernels (i.e mean value in a 3x3 grid, nearest neighbour value, etc). In
summary, perform operations in the surface such as a 2D matrix/image.
Is it possible to do it with Freesurfer? I tried to ope
