Workbench Command is a set of command-line tools that can be used to perform simple and complex operations within Connectome Workbench.
MEASURE DISTORTION BETWEEN SURFACES wb_command -surface-distortion <surface-reference> - the reference surface <surface-distorted> - the distorted surface <metric-out> - output - the output distortion metric [-smooth] - smooth the area data <sigma> - the size of the smoothing kernel in mm, as sigma by default [-fwhm] - kernel size is FWHM, not sigma [-caret5-method] - use the surface distortion method from caret5 [-edge-method] - calculate distortion of edge lengths rather than areas [-local-affine-method] - calculate distortion by the local affines between triangles [-log2] - apply base-2 log transform This command, when not using -caret5-method, -edge-method, or -local-affine-method, is equivalent to using -surface-vertex-areas on each surface, smoothing both output metrics with the GEO_GAUSS_EQUAL method on the surface they came from if -smooth is specified, and then using the formula 'ln(distorted/reference)/ln(2)' on the smoothed results. When using -caret5-method, it uses the surface distortion method from caret5, which takes the base 2 log of the ratio of tile areas, then averages those results at each vertex, and then smooths the result on the reference surface. When using -edge-method, the -smooth option is ignored, and the output at each vertex is the average of 'abs(ln(refEdge/distortEdge)/ln(2))' over all edges connected to the vertex. When using -local-affine-method, the -smooth option is ignored. The output is two columns, the first is the area distortion ratio, and the second is anisotropic strain. These are calculated by an affine transform between matching triangles, and then averaged across the triangles of a vertex.