Skin > Edit Rigid Skin > Create Flexor

Flexor Type: Specifies whether to create lattice flexors, sculpt flexors, or joint cluster flexors. Select lattice, sculpt, or joint cluster. Default is lattice.
Joints: Specifies whether to create joint lattice, joint sculpt, or joint cluster flexors at selected joints only, or at all a skeleton’s joints. Click At Selected Joint(s) or At All Joint(s). Default is At Selected Joint(s).
Bones: Specifies whether to create bone lattice or bone sculpt flexors at selected bones only, or at all bones. Click At Selected Bone(s) or At All Bone(s) to create. Default specifies no bone flexors will be created. This option does not apply to joint cluster flexors.

Lattice Options

If Flexor Type is lattice, specify the Lattice Options:

S, T, U Divisions: Specifies the structure of the lattice in the lattice’s local STU space. (STU space provides a special coordinate system for specifying the structure of lattices.)

You can specify the lattice structure in terms of S, T, and U divisions. When you specify the divisions, you also specify the number of lattice points in the lattice, because the lattice points are located where the divisions meet on the lattice’s exterior. The greater the number of divisions, the greater the lattice point resolution. Though your control over the deformation increases with the number of lattice points, the performance may be affected.

The default settings are S has 2 divisions, T has 5 divisions, and U has 2 divisions, which provides 20 lattice points. You can quickly change the settings by using the sliders to select values from 2 to 20.
Position the Flexor: Specifies that you want to move, rotate, or scale the lattice now, before you create the lattice flexor. This enables you to adjust the lattice before it starts having an effect on skin objects. Click Position the Flexor, and then use the Move Tool, Rotate Tool, or Scale Tool to adjust the lattice now.

Sculpt Options

If Flexor Type is sculpt, specify the Sculpt Options:

Max Displacement: Specifies the distance that the sculpt sphere can push a skin object’s points from the sculpt sphere’s surface.Use slider to select values from 0.000 to 2.000. Default is 0.000.
Dropoff Distance: Specifies the sculpt sphere’s range of influence. (How the range of influence can decline is specified by Dropoff Type.) Use slider to select values from 0.000 to 20.000. Default is 0.000.
Dropoff Type: Specifies how the sculpt sphere’s range of influence declines or drops off. (The range of influence is specified with the Dropoff Distance.) There are two Dropoff Types: None and Linear. Default is None.
Mode: Specifies the sculpt sphere’s deformation mode as flip, project, or stretch. Select Flip, Project, or Stretch. Default is Stretch.
Inside Mode: Specifies how the sculpt sphere influences the skin points located inside the sculpt sphere. There are two modes: Ring and Even.

Ring mode pushes inside points outside of the sculpt sphere, creating a contoured, ring-like effect around the sculpt sphere.

Even mode spreads the inside points all around the sculpt sphere evenly, creating a smooth, spherical effect.

Select Ring or Even. Default is Ring.