9

Skin Modifier 793
4.
In the Weight Properties group, change the Abs.
Effect parameter to the new vertex weight.
To mir r or envelope or ver tex weight setti ngs:
1.
Adjust envelopes and vertex weights on one
side of the mesh.
2. On the Mirror Parameters rollout, click Mir ror
Mode.
The mirror plane appears at the position and
orientation of the mesh’s pivot point.
3. If the mirror plane is not at the center of the
mesh, change the Mirror Offset parameter to
movetheplanetothecenter.
4. If some vert ices in the left or right side of the
mesh are red rather than blue or green, increase
the Mirror Thresh value until all vertices are
blue or green.
5. On the Mirror Parameters rollout, click the
appropriate Paste button to paste green or blue
envelopes or vertex weights to the other side
of the mesh.
To a djust the ski n and/or bones without af fecting
the envel opes:
1.
Save the scene.
This is a potentially destructive operation, so
it’s best not to take any chances with your data.
2. Select the object to which the Skin modifier is
applied.
3. In the Advanced Parameters rollout, turn off
Always Deform.
4. Apply any necessary transforms to the
mesh/patch object or bones objects.
5. Turn Always Deform back on.
To adjust the bones only, you can also use skin
pose (page 1–116) .
Example: To apply the Sk in modifier to a cylinder
with a bones skel eton:
1.
OntheCreatepanel,under
Standard Primitives, click Cylinder .
2. InthemiddleoftheTopviewport,clickand
drag20unitstocreatethebaseofthecylinder.
3. Releasethemousebuttonanddragup130units
to establish the height of the cylinder.
4. On the parameters rollout, set Height Segments
to 20.
This provides mesh detail for a smooth surface
deformation.
5. OntheCreatepanel,under
Systems, click Bones
.
Mak e sure an IK Solver
is chosen in the IK
Solver list. Turn on Assign To Children. (This
should turn on Assign To Root as well.)
6. In the Front viewport, click successively three
times: below the cyl
inder, in the middle of the
cylinder, and above the top of the cylinder.
7. Right-click to end Bones c reation.
Three bones display. Two of them are within
the midd le of the cylinder.
8. Select the cylinder.
9. OntheModifypanel,chooseSkinfrom
the Modifier List.
10. On the Skin modifier’s Parameters rollout, click
Add, and use the Select Bones dialog to select
the three bones.
Thenamesofthebonesarenowdisplayedin
the list.
11. In the Front viewport, select the b one end
effector (IK Chain01) and move it around.