Hi Andrew,
I'm not aware of a Caret feature that ensures uniform resampling, but
the caret_command -deformation-map-apply and -deformation-map-create
features do support non-uniform resampling. Simplify surface will just
reduce the number of nodes; it doesn't ensure uniform spacing.
Have a look at AFNI/SUMA's IsoSurface command line utility. The usage says:
NOTE:
The code for the heart of this program is a translation of:
Thomas Lewiner's C++ implementation of the algorithm in:
Efficient Implementation of Marching Cubes´ Cases with Topological
Guarantees
by Thomas Lewiner, Hélio Lopes, Antônio Wilson Vieira and Geovan Tavares
in Journal of Graphics Tools.
http://www-sop.inria.fr/prisme/personnel/Thomas.Lewiner/JGT.pdf
The name suggests uniform node spacing, although I could be
misinterpreting it.
The entire suite of AFNI/SUMA goodness awaits you at:
http://afni.nimh.nih.gov/afni/
SUMA can read both Freesurfer and Caret formats, and probably the new
GIfTI surface standard as well.
Donna
On 08/07/2008 04:03 AM, Andrew Reid wrote:
Hi all,
I need to get a uniform resampling of a cortical surface mesh. Caret has
a "Simplify surface" command, however this appears to perform a
selective resampling (i.e., preferentially removing nodes which carry
less information), so this is not ideal for us. Is there another way to
do this with Caret? I think that the deformation map process can also
result in a resampled surface, but I'm not sure of the best way to do this.
Cheers,
Andrew
