  In this paper, we present a solution for arbitrary 3D character deformation
by investigating rotation angle of decomposition and preserving the mesh
topology structure. In computer graphics, skeleton extraction and
skeleton-driven animation is an active areas and gains increasing interests
from researchers. The accuracy is critical for realistic animation and related
applications. There have been extensive studies on skeleton based 3D
deformation. However for the scenarios of large angle rotation of different
body parts, it has been relatively less addressed by the state-of-the-art,
which often yield unsatisfactory results. Besides 3D animation problems, we
also notice for many 3D skeleton detection or tracking applications from a
video or depth streams, large angle rotation is also a critical factor in the
regression accuracy and robustness. We introduced a distortion metric function
to quantify the surface curviness before and after deformation, which is a
major clue for large angle rotation detection. The intensive experimental
results show that our method is suitable for 3D modeling, animation, skeleton
based tracking applications.
