Edition of mesh slices.
gf_slice_set(slice S, 'pts', mat P)
Edition of mesh slices.
gf_slice_set(slice S, 'pts', mat P)
Replace the points of the slice.
    The new points P are stored in the columns the matrix. Note that
    you can use the function to apply a deformation to a slice, or to
    change the dimension of the slice (the number of rows of P is not
    required to be equal to gf_slice_get(slice S, 'dim')).
Y. Collette