UT3Tangent.stack_frame
======================

.. py:method:: t3toolbox.uniform_manifold.UT3Tangent.stack_frame(tree)
   :staticmethod:


   .. code-block:: python

      def stack_frame(tree) -> 'UT3Tangent':


   Stack a ``C``-shaped tree of single-base-point tangents into a frame-stacked UT3Tangent.

   Inverse of :py:meth:`unstack_frame`. The leaves sit at **different** base points, so no shared-frame
   identity is required; they must share the padded dims ``(d, N, nU, nD, rL, rR)``, the real mode
   ``shape``, and the tangent stack ``K`` -- but the **ranks/masks MAY differ across the frame stack
   ``C``** (varying-rank stacks are supported). The bases stack over the inner frame stack ``C`` (so the
   variation stack becomes ``K + C``).