Using Workbench Command

Workbench Command is a set of command-line tools that can be used to perform simple and complex operations within Connectome Workbench.

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FLIP ALL TILES ON A SURFACE
   wb_command -surface-flip-normals
      <surface> - the surface to flip the normals of
      <surface-out> - output - the output surface

      Flips all triangles on a surface, resulting in surface normals being
      flipped the other direction (inward vs outward).  If you transform a
      surface with an affine that has negative determinant, or a warpfield that
      similarly flips the surface, you may end up with a surface that has
      normals pointing inwards, which may have display problems.  Using this
      command will solve that problem.