  We propose a new framework for creating and easily manipulating 3D models of
arbitrary objects using casually captured videos. Our core ingredient is a
novel hierarchy deformation model, which captures motions of objects with a
tree-structured bones. Our hierarchy system decomposes motions based on the
granularity and reveals the correlations between parts without exploiting any
prior structural knowledge. We further propose to regularize the bones to be
positioned at the basis of motions, centers of parts, sufficiently covering
related surfaces of the part. This is achieved by our bone occupancy function,
which identifies whether a given 3D point is placed within the bone. Coupling
the proposed components, our framework offers several clear advantages: (1)
users can obtain animatable 3D models of the arbitrary objects in improved
quality from their casual videos, (2) users can manipulate 3D models in an
intuitive manner with minimal costs, and (3) users can interactively add or
delete control points as necessary. The experimental results demonstrate the
efficacy of our framework on diverse instances, in reconstruction quality,
interpretability and easier manipulation. Our code is available at
https://github.com/subin6/HSNB.
