Weighted Pose Space Editing for Facial Animation
Paper (1.18M PDF)
Blendshapes are most commonly used by
animators to produce facial animation in production.
Typically, the animators begin with a relatively small
number of blendshapes, encounter a limit on expressiveness,
then sculpt additional blendshapes to achieve
the animation goal. To make this additional sculpting
process much more efficient, we present a novel
editing method for blendshape based facial animation.
Based on the delta formulation of blendshape, additional
sculptings on already keyframed animation train
a Radial Basis Functions (RBF) network with the Gaussian
kernel for each vertex. Using this technique, the
artist's sculpting on a problematic expression is automatically
applied to similar expressions in an entire sequence,
and indeed all future sequences. The amount
of editing effect is easily controllable and the effect is
smoothly propagated through the surrounding frames
of the similar expressions. We applied this technique
to facial animation sequences that require the editing
of further sculpting. In addition, we present a search
scheme that allows effective reuse of pre-sculpted editing examples.
Our system greatly reduces time and effort required
by animators to create high quality facial animations.