[caret-users] Resampling a surface

[Donna Dierker]

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
>
>