8

784 Chapter 8: Modifiers
The cylinder deforms to follow the bones.
To adjust envelopes to refine the surface
deformation, choose the Skin modifier’s
Envelope sub-object level, and use the Edit
Envelopescontrolstoresizeenvelopesand
change vertex weights.
Example: To use a morph a ngle deformer:
Create the cylinder and bones from the preceding
procedurebeforeyoucontinuewiththis
procedure.
1. Atframe50,animatebone2sothatbones1
and 2 represent a 90-degree ang le.
2. Atframe0,thebonesshouldbestraightat
about a 180-degree angle.
3. Move to frame 0.
4. Turn on Edit Envelopes in the Parameters
rollout.
5. Select the child bone (bone 2) in the modifier’s
list of b ones.
6. IntheSelectgroup,turnonVertices.
This allows you to select vert ices.
7. In the viewports, region-window select a good
portion of the vertices that are controlled by
both bones.
8. In the Gizmos rollout, select the Mo rph Angle
Deformer in the drop-down list, and then click
Add Gizmo.
The Deformer Parameters rollout displays. A
base morph target is the first and only target
in the list.
Tip: if the Deformer do esn’t assign, m ake sure
that bone 2 and not bone 1 is selected in the list.
9. Scrub the Time Slider to frame 50.
10. Add an Ed it Mesh modifier above the Skin
modifier in the modifier stack.
11. Turn on Vertex and Soft Selection in the Edit
Mesh modifier .
12. Editthemeshtotheshapeyouwant.
13. G o back down in the stack to the Skin modifier.
If the topology warning dialog appears, click
Ye s .
14. In the Deformer Parameters rollout, click Add
From Stack.
A new morph target is added at about 90
degrees.
15. Delete the Edit Mesh modifier from the stack.
There is a doubling effect of the morph if
you don’t delete or deactivate the Edit Mesh
modifier.
16. Sc rub the time slider. The mesh morphs as the
bone angle changes.
Interf ace
The Skin Modifier interface includes the following
rollouts:
•
Parameters rollout (page 1–785)
• Mirror Parameters rollout (page 1–789)
• Display rollout (page 1–790)
• Advanced Parameters rollout (page 1–791)
• Gizmos rollout (page 1–792)
• Deformer Parameters rollout (page 1–794)
• Joint Angle and Bulge Angle parameters (page
1–794)
Tip: Some of the Sk in modifier commands are also
available from the
quad menu (page 3–741) .
Modifier Stack
Envelope—Turn on this sub-object level to work
on envelopes and vertex weights.
Tip: Yo u c a n u s e t h e q u a d m e n u t o c h o o s e t h i s
sub-object level.