HumanIK Roll and Pitch attributes

To open the Roll and Pitch attributes

• With the character skeleton selected, from the Attribute Editor, choose the HIKproperties tab

Lets you select the Absolute or Relative mode.

• Relative mode - manages HIK-generated Roll amounts
• Absolute mode - manages both user generated and HIK-generated Roll amounts

Note: The following settings apply for the left and right sides of the body.

Left/Right Leg Left/Right Arm Extract Full Roll

Roll nodes let you map bones of upper arms, lower arms, upper legs and lower legs for your character. Whenever a HIK solver applies roll rotation to a node that has a child roll node, a percentage of that roll rotation can be extracted from the parent node and applied to the child roll node instead. This process is referred to as roll extraction. Roll extraction simulates the way biped and quadruped arms and legs actually rotate around their axes. It can enhance the realism of the animations created for skinned characters by controlling skin deformations from more appropriate positions further along the limb.

You can map a maximum of five leaf roll bones per limb. All leaf roll bones are parented to the same limb bone, and the placement of leaf roll bones along the bone and the percentage of rotation per leaf roll bone is determined by the number of leaf roll bones per limb. When limbs have more than one leaf roll bone, the percentage of rotation is divided between the bones. See also Define roll bone behavior.

Left/Right Leg Roll settings

The Roll settings let you specify the bones that receive a percentage of the roll axis movement. For example, if the forearm of your model includes a roll bone, you can transfer part of the roll animation onto the roll bone using the Left or Right ForeArm Roll setting.

• To specify how much of the roll transfers from the limb to the roll object (the default setting is 60%), set a percentage using the following guidelines:
• At 100%, all of the roll transfers from the original limb to the roll bone, moving the roll bone and its parent.
• At 50%, the roll is equally distributed between the limb and the roll bone.
• At 0%, none of the roll is transferred to the rest of the limb, moving only the roll bone.

Left/Right Knee/Elbow Kill Pitch

The Kill Pitch options let you remove the pitch axis on the left or right knees and elbows.

This option is useful when, in certain contexts, there may be a reason you do not want a roll injected on elbows or knees. If you want elbows and knees to behave like perfect hinges that only rotate around the main folding axis, you can use the Kill Pitch setting ensure that all unacceptable pitch values on Knees and Elbows is destroyed.