T3Tangent.stack_tangents

static t3toolbox.manifold.T3Tangent.stack_tangents(tree)

def stack_tangents(tree) -> 'T3Tangent':

Stack a K-shaped tree of tangents (sharing one frame) into a tangent-stacked T3Tangent.

Inverse of unstack_tangents(). Requires every leaf to be at the same frame (the same-frame numerical check, as in corewise_inner() / __add__()): the tangents being stacked must live in the same tangent space. The first leaf’s frame is reused and the variations are stacked over the new outer tangent stack K.

Return type:

T3Tangent