Deformation space. The deformation space Bshows in real time
the corresponding deformation of the 3D model. To compute the
deformation spaceB, we calculate the minimum bounding space
of the actual joints position, obtaining the minimum and maximum position values r0andr1(seeFig. 6first row). To allow the
joints to move ‘‘outward’’ of their actual position, but also to
support exaggeration of deformations, we expand the space by a
displacement valued. The points b0andb1are the deformation
space limits, which are defined as b0¼r0d, b1¼r1þd. Fig. 6
second row shows a close-up of the mouth region with different
displacement values and consequently different deformation
spaces.