Page 1026 - Kitab3DsMax

Part IX: Working with Characters
FIGURE 40.4
Envelopes define which Skin vertices move with the underlying bone.

An envelope consists of two capsule-shaped volumes within each other called the Inner and Outer
Envelopes. Any vertices within the inner envelope are controlled exclusively by that bone. Any vertices
positioned between the inner and outer envelopes are controlled by a falloff where the influence is shared
between bones.
At either end of these envelopes are four small handles that can be dragged to change the cross-section
radius. The cross-section area changes to pink when selected. The radius of the selected cross section is dis-
played in the Radius field within the Envelope Properties section of the Parameters rollout. The Squash
value determines the amount of squash applied to the object for bones that can stretch. You can change an
envelope’s size by changing its Radius value or by dragging the cross-section handles. Within the Select sec-
tion of the Parameters rollout, you can choose to select and edit Vertices, Envelopes, and/or Cross Sections.
If you choose the Vertices option, selected vertices are shown as small squares, and the Shrink, Grow, Ring,
and Loop buttons become active. These buttons allow you to select a desired set of vertices easily. If the
Select Element option is enabled, then all vertices in the element are selected, and the Backface Cull Vertices
option prevents vertices on the backside of the object from being selected.
If a cross section is selected, you can add a different cross-section shape using the Add button. This button
lets you select a cross-section shape within the viewports. The Remove Cross Section button removes an
added cross section from the envelope.

978