T3Tangent.stack_frame

static t3toolbox.manifold.T3Tangent.stack_frame(tree)

def stack_frame(tree) -> 'T3Tangent':

Stack a C-shaped tree of single-base-point tangents into a frame-stacked T3Tangent.

Inverse of unstack_frame(). The leaves sit at different base points (distinct bases), so no shared-frame identity is required; they must share the same structure and the same tangent stack K. The bases are stacked over the frame stack C, which is placed innermost so the variation stack becomes K + C.

Return type:

T3Tangent