new_geodesic_path: Generate a geodesic path between bases supplied by generator
Description
A tour path is a function that when called with the
  current projection and data set, generates sequence of
  geodesic_paths.  The path can either span
  the whole space of orthonormal matrices, the default or
  be restricted to a subspace with the frozen argument.
  More details are given in the documentation for
  freeze.Usage
new_geodesic_path(name, generator, frozen = NULL)
Arguments
name
name to give tour path
generate
basis generator function
frozen
matrix giving frozen variables, as
  described in freeze Details
Subsequent frames are guaranteed to be at least 0.001
  radians away from the current frame.  If after 10 tries
  the generator does not give a new basis at least this far
  away then we give up.  If a suitable new basis can not be found, the path
  function returns NULL indicating that the tour should
  stop.