spline that runs through the joints in
the skeleton's hierarchy. A deformable (as opposed to rigid) envelope
is one that moves the mesh vertices it encloses as the skeleton moves.
A link can have both
a deformable and a rigid envelope. When it has both, the effect
of the two is averaged, creating a less flexible skin.
In character animation,
you typically use deformable envelopes; however, some portions of
the body, such as the head, might look best if they are rigid. See
and Rigid Envelopes.
NoteBecause of game-engine
restrictions, if you are developing for certain engines, you might
want to use rigid envelopes exclusively.
TipIf your model consists
of articulated rigid segments, such as a marionette, you might not
need to use Physique at all. Simply link each part to the corresponding