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Overload for
igl::marching_cubesto return an edge-to-vertex data-structure. This enables fully batched based extraction of iso-surfaces using root finding (as shown in909_BatchMarchingCubes). The killer use case is not really signed-distance to a mesh (which is locally pretty linear), but funkier things like NeRFs or generalized winding numbers. This allows the caller to be in control of supplying values for vertex positions after extraction the edge-based sign crossings.