On Oct 20, 2017, at 4:24 PM, tony han <oktony...@hotmail.com<mailto:oktony...@hotmail.com>> wrote:
Hi John and David, Thanks a lot for your reply! Yes I'm thinking to move from Caret to Workbench since most of the time we use wb_command a lot and it makes sense to keep our tools up-to-date and consistent. Just want to clarify: the weights (last 3 columns) of the vertices (indexed by the first 3 columns) are decided by the distance from the 3 vertices of SOURCE to the vertex of TARGET? If so, maybe that's the reason why why the sum of weights is not one for each vertex of TARGET? While I referred to the last three columns as weights, they are actually triangular areas. If you view the triangle with black and blue lines at http://mathworld.wolfram.com/BarycentricCoordinates.html, A1, A2, and A3 are the source vertices and P is the target vertex. The last three columns in the file are the areas t1, t2, and t3. So the reason why I'm looking at deformation maps is that I'm trying to figure out a way to quantify the deformation from native space to fs_LR at each vertex on the surface (32k fs_LR atlas surface). Could you give me any suggestion? ________________________________ From: David Van Essen <vanes...@wustl.edu<mailto:vanes...@wustl.edu>> Sent: Friday, October 20, 2017 3:41:11 PM To: Caret, SureFit, and SuMS software users; tony han Subject: Re: [caret-users] info in the deformation maps Hi Tony et al. John’s explanation regarding deformation map files is correct. Here, I’m drawing to your attention the fact that Connectome Workbench (and wb_command) provides improved methods for mapping from one surface mesh that has been registered to another (see below). Depending on your use case scenario, you (and others) may decide to stick with Caret and its deformation maps (even though Caret is no longer under active development). Or you may find it advantageous to switch to wb_command for future analyses, as it has become more powerful and flexible, and is still under active development (https://www.humanconnectome.org/software/connectome-workbench). wb_command -label-resample wb_command -metric-resample <current-sphere> - a sphere surface with the mesh that the metric is currently on <new-sphere> - a sphere surface that is in register with <current-sphere> and has the desired output mesh <method> - the method name The <method> argument must be one of the following: ADAP_BARY_AREA BARYCENTRIC as explained in the command-line usage instructions On Oct 20, 2017, at 2:36 PM, Harwell, John <jharw...@wustl.edu<mailto:jharw...@wustl.edu>> wrote: Hello, You are correct, it is not an affine matrix. A description of the file’s content is available at http://brainvis.wustl.edu/CaretHelpAccount/caret5_help/file_formats/file_formats.html#deformationMapFile. Essentially, the deformation map file defines a resampling of one surface triangular mesh to another. For each vertex in the target surface, it identifies the corresponding location in the source surface using barycentric coordinates. A barycentric coordinate contains three vertex indices that form a triangle and the weights define the location within the triangle. John H On Oct 20, 2017, at 1:00 PM, tony han <oktony...@hotmail.com<mailto:oktony...@hotmail.com>> wrote: Hi, I notice that there are 6 columns of data stored in the deformation map (actually it's 7 but the first one looks like the indices). So what are these columns? It doesn't look like affine matrices? Thanks! Best, Tony _______________________________________________ caret-users mailing list caret-users@brainvis.wustl.edu<mailto:caret-users@brainvis.wustl.edu> http://brainvis.wustl.edu/mailman/listinfo/caret-users _______________________________________________ caret-users mailing list caret-users@brainvis.wustl.edu<mailto:caret-users@brainvis.wustl.edu> http://brainvis.wustl.edu/mailman/listinfo/caret-users _______________________________________________ caret-users mailing list caret-users@brainvis.wustl.edu<mailto:caret-users@brainvis.wustl.edu> http://brainvis.wustl.edu/mailman/listinfo/caret-users
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