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938 Chapter 14: Character Studio
the inner and outer bound have a weighted value
that fa lls off to 0 at the outer bound.
Vertices are color—coded in the viewports
according to their weight; the color is based on
parameters you specif y in the
Blending Envelope
Display Options Dia log (page 2 –976)
.
See also
Envelope Sub-Object (page 2–981)
Adjusting Defa ult E nvelope Shape
When you want to address vertex-linking
anomalies, the first step is to resize or reposition
the envelope about the problem link. Most of ten,
the problem is an envelope that istoo small to
surround, and thereby influence, certain vertices.
This can happen because your biped character
misalig ns slightly with the mesh, or the link
lengths used to create envelopes with unbounded
bones systems links were insufficient to surround
all vertices attached to the link.
Another potential source of problems is
overlapping inner bounds. This can sometimes
create too strong a deformation at the joint.
You’ll note problems with vertices as you preview
motion. It sometimes looks like vertices got left
behind when the link they were supposed to be
attached to mov es in 3D space. In fact, that’s just
what is happening: they weren’t assig ned to any
link at all, and remain where they were at the initial
skeletal pose: the pose of the mesh and its skeleton
atthetimePhysiquewasappliedandinitialized.
The other case would be vertices being moved too
much, resulting in a dent in the mesh. You’d fix
this by decreasing the overlap of the envelopes
affecting a joint.
Stray vertices (above) reassign ed to correct lin k(s) by
modifying envelope shape (below).
Procedures
To adjust default envelope shape:
1.
In the Selection Level group of the Blending
Envelopes rollout, turn on Link. In a viewport,
select any link.
2. In the Parameters g roup, turn on the Inner,
OuterorBothoptionandthenincreasethe
value of Radial Scale until the outer envelope
just surrounds the character mesh.
Note: With Both tur ned on, both the inner and
outer bounds scale together.
3. Increase the Parent Overlap value u ntil the
inner (red) envelope appears through the mesh.
4. If necessary, decrease the Falloff value to
strengthen this envelope.