T3Tangent.unit
==============

.. py:method:: t3toolbox.manifold.T3Tangent.unit(frame, index)
   :staticmethod:


   .. code-block:: python

      def unit(
              frame:  bvf.T3Frame,
              index,              # (use_tt_coordinate, i, within_index); see T3Variations.unit
      ) -> 'T3Tangent':


   Canonical unit tangent at ``frame``: variations zero except a single core entry.

   ``index = (use_tt_coordinate, i, within_index)`` (see :py:meth:`T3Variations.unit`). These units
   are the standard basis of the variation cores -- an overcomplete, non-ambient-orthogonal
   generating set of the tangent space, not an orthonormal basis (gauge it yourself if needed).