Hi Stefan,
you could also try the matlab 'reducepatch' command.
Best, Darren
Stefan Tomic wrote:
Thanks Bruce,
The decimation algorithm works fine on meshes generated in freesurfer so I doubt it's a bug. We are trying to decimate a scalp mesh generated in EMSE and imported into freesurfer. The original meshes I tried had about 32,000 vertices and I'm wondering if this is not a large enough number for adequately controlling the degree of spacing. I am now trying to generate a scalp tessellation with the freesurfer tools to see if the decimation algorithm produces better results.
Best Regards,
Stefan Tomic
On Jul 28, 2004, at 5:30 AM, Bruce Fischl wrote:
Hi Stefan,
the downsampling doesn't use curvature. It is supposed to sample every nth node, where n is the spacing you select. If it's not doing that, then it's a bug. Perhaps Matti or Thomas can comment?
cheers, Bruce
On Tue, 27 Jul 2004, Stefan Tomic wrote:
Dear list,
Does anyone know where I might find a description of the decimation algorithm used in tksurfer? I am decimating a scalp surface in tksurfer with some success. I am using the tool because it produces a relatively homogenous subsampling. However, it produces exactly the same subsampling on a given scalp surface for any value that I enter for the "spacing" setting. I would like to be able to control the degree of subsampling.
I realize that I'm using the tool in a non-conventional way. It seems to me that the decimation algorithm is using surface curvature in some way, which is likely why I am not able to control the degree of decimation on a scalp surface. If anyone has any thoughts on this, or could point me to any documentation, I'd be really grateful.
Best regards,
Stefan Tomic
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