2009

The resulting deformation will be w1*l1 + w2*l2 + w3*l3 + wf*root. The root
portion of this deformation is essentially an undeformed portion that simply
follows the root of the skeleton.
In Cases where Some Envelopes Use Partial Blending and Some Do
Not
The vertex weight fill-in in overlap areas will be based on the percentage of
partial and non partial weights. For example, If the total weight of non partial
links is 80% of the total summed partial and non partial weight, then 80% of
the fill-in will be more of the non partial deformation. The remaining 20%
fill-in will come from the root.
Example: If Vertex v is assigned to links l1, l2, and l3, the weights for these
links are: w1 = 0.2, w2 = 0.3, and w3 = 0.4.
Let's assume l1 and l2 are nonpartial, and l3 is partial. The nonpartial weight
is w1 + w2 = 0.5; the partial weight is w3 = 0.4; the nonpartial weight is
0.5/(0.5+0.4) = .555555, or 56%; and the fill-in weight is still (1.0 - .9) or wf =
0.1.
The program fills in with 56% of wf with more of the nonpartial blended links.
The remaining 44% of wf is filled in with the root as in the partial blended
case. This provides a smooth transition between the partial and nonpartial
links.
Bulges
For some animations, simply attaching the skin and correcting its vertex
assignments results in an animated skin you can use in final renderings. For
other animations, you might need to give the skin more realistic movement,
for example, muscles that bulge.
Physique lets you simulate an underlying musculature for the skin by adding
tendons on page 4652 and bulges:
■ Bulges change the skin's profile to simulate bulging muscles. You create
the bulge by establishing bulge angles, relationships between cross-sectional
slices of the skin and specific poses of the skeleton joint. Imagine a cross
section to be a slice through the skin's mesh, perpendicular to the link. By
making changes to cross sections, you in turn distort the shape of the
mesh. Bulges in your character can be constructed by associating certain
poses with related changes to the cross sections, in other words by defining
bulge angles.
Using Physique | 4647